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UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, DCD.C. 20549
Form 10-K
(Mark One)
ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the fiscal year ended December 31, 20172023
OR
TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
Commission File Number:
001-36014
AGIOS PHARMACEUTICALS, INC.
(Exact name of registrant as specified in its charter)
Delaware
Delaware26-0662915
(State or other jurisdiction of
incorporation or organization)
(IRS Employer
Identification No.)
88 Sidney Street,
Cambridge, MA
02139
(Address of principal executive offices)(Zip Code)
Registrant’s telephone number, including area code:
(617) 649-8600
Securities registered pursuant to Section 12(b) of the Act:
Title of ClassTrading symbol(s)Name of Exchange on Which Registered
Common Stock, Par Value $0.001 per shareAGIONASDAQNasdaq Global Select Market
Securities registered pursuant to Section 12(g) of the Act: None
Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  ☑        No  ☐
Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  ☐        No  ☑
Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ☑        No  ☐
Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  ☑        No  ☐
Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.    ☐
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act.
Large accelerated filer  ☑Accelerated filer  ☐
Non-accelerated filer  ☐
(Do not check if a smaller reporting company)
Smaller reporting company  ☐Emerging growth company  ☐
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.    ☐
Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☑
If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to previously issued financial statements.    ☐
Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive officers during the relevant recovery period pursuant to §240.10D-1(b).    ☐
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    Yes   ☐         No   ☑
The aggregate market value of the voting and non-voting Common Stock held by non-affiliates of the registrant computed by reference to the price of the registrant’s Common Stock as of June 30, 20172023 (based on the last reported sale price on the NASDAQNasdaq Global Select Market as of such date) was $2,154,093,268.$1,557,785,326.
As of February 9, 2018,2024, there were 57,326,74156,194,847 shares of Common Stock, $0.001 par value per share, outstanding.


Table of Contents
DOCUMENTS INCORPORATED BY REFERENCE
Portions of the registrant’s definitive proxy statement for its 20182024 Annual Meeting of Stockholders to be filed pursuant to Regulation 14A within 120 days of the end of the registrant’s fiscal year ended December 31, 20172023 are incorporated by reference into Part III of this Annual Report on Form 10-K to the extent stated herein.



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PART I
References to Agios
Throughout this Annual Report on Form 10-K, “the Company,” “Agios,” “we,” “us,” and “our,” and similar expressions, except where the context requires otherwise, refer to Agios Pharmaceuticals, Inc. and its consolidated subsidiaries, and “our board of directors” refers to the board of directors of Agios Pharmaceuticals, Inc.
Cautionary Note Regarding Forward-looking Information
This Annual Report on Form 10-K contains forward-looking statements that involve substantial risks and uncertainties. All statements, other than statements of historical facts,fact, contained in this Annual Report on Form 10-K, including statements regarding our strategy, future operations, future financial position, future revenue, projected costs, prospects, plans, and objectives of management, are forward-looking statements. The words “aim,” “anticipate,” “believe,” “continue,” “could,” “estimate,” “expect,” “goal,” “intend,” “may,” “might,” “plan,” “potential,” “predict,” “project,” “should,” “strategy,” “target,” “potential,“vision,” “will,” “would,” “could,” “should,” “continue”“would” or the negatives of these words and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words.
The forward-looking statements in this Annual Report on Form 10-K include, among other things, statements regarding:
our commercialization efforts and plans to commercialize PYRUKYND® (mitapivat);
the initiation, timing, progress and results of current, planned and future preclinical studies and clinical trials, and our research and development programs;
the potential of isocitrate dehydrogenase 2 and 1, or IDH2 and IDH1, respectively, andthe isoforms of pyruvate kinase, including pyruvate kinase-R, mutations, methionine adenosyltransferase 2a, or MAT2A, and dihydroorotate dehydrogenase, or DHODH,PKR, as therapeutic targets;
the potential benefits of our products and product candidates targeting IDH2, IDH1 PKR, including PYRUKYND® (mitapivat) and AG-946, and of our product candidate in our phenylalanine hydroxylase, or pyruvate kinase-R mutations, MAT2A or DHODH, including IDHIFA®, ivosidenib, AG-881, AG-348, and AG-270;PAH, stabilizer program, AG-181;
our plans to develop and commercialize ourany additional product candidates including our ability to successfully commercialize IDHIFA®for which we may receive approval, either alone or with our partner Celgene Corporation, or Celgene, and to obtain regulatory approval for, and successfully commercialize, ivosidenib;partners;
our collaborations with Celgene and related subsidiaries;
our ability to establish and maintain additional collaborations or to obtain additional funding;funding, if needed;
the timing or likelihood of regulatory filings and approvals, including approvals;
our new drug application,strategic vision;
the timing, likelihood and amount of contingent consideration we may receive from Servier Pharmaceuticals LLC, or NDA, filedServier, in December 2017connection with the U.S. Foodsale of our oncology business to Servier that we consummated in March 2021;
the amount and Drug Administration, or FDA, for ivosidenib for the treatmenttiming of adult patients with relapsed or refractory acute myeloid leukemia, or R/R AML with an IDH1 mutation,future milestone and the Marketing Authorization, or MAA, we planroyalty payments potentially payable to submitAlnylam Pharmaceuticals, Inc. pursuant to the European Medicines Agency, or EMA,license agreement entered into in the fourth quarter of 2018 for ivosidenib for IDH1 mutant-positive R/R AML;July 2023;
the implementation of our business model and strategic plans for our business, product candidates and technology;
our commercialization, sales, marketing and manufacturing capabilities and strategy;
the rate and degree of market acceptance and clinical utility of our products;
our competitive position;
our intellectual property position;
developments and projections relating to our competitors and our industry; and
our estimates regarding our expenses, future revenue, capital requirements and needs for additional financing.financing; and
the potential impact of public health epidemics or pandemics, including the COVID-19 pandemic, and of global economic developments on our business, operations, strategy and goals.
We may not actually achieve the plans, intentions or expectations disclosed in our forward-looking statements, and you should not place undue reliance on our forward-looking statements. Actual results or events could differ materially from the plans, intentions and expectations disclosed in the forward-looking statements we make. We have included important factors in this Annual Report on Form 10-K, particularly in the “Summary Risk Factors” and “Risk Factors” section,sections, that could cause actual results or events to differ materially from the forward-looking statements that we make. Our forward-looking statements do not reflect the potential impact of any future acquisitions, in-licensing arrangements, mergers, dispositions, joint ventures or investments we may make.
You should read this Annual Report on Form 10-K and the documents that we have filed as exhibits to this Annual Report on Form 10-K completely and with the understanding that our actual future results may be materially different from what we

expect.completely. We do not assume any obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law.
This Annual Report on Form 10-K includes statistical and other industry and market data that we obtained from industry publications and research, surveys and studies conducted by third parties as well as our own estimates of potential market
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opportunities. All of the market data used in this Annual Report on Form 10-K involves a number of assumptions and limitations, and you are cautioned not to give undue weight to such data. We believe that the information from these industry publications, research, surveys and studies is reliable. The industry in which we operate is subject to a high degree of uncertainty and risk due to a variety of important factors, including those described in the sections titled “Summary Risk Factors” and “Risk Factors.”
Summary Risk Factors
Our business is subject to a number of risks that if realized could materially affect our business, financial condition, results of operations, cash flows and access to liquidity. These risks are discussed more fully in the “Risk Factors” section of this Annual Report on Form 10-K. Our principal risks include the following:
If we do not successfully commercialize PYRUKYND® for the treatment of adults with PK deficiency in the approved jurisdictions and other products for which we receive approval, our prospects may be substantially harmed. Our ability to generate product revenue from PYRUKYND® depends heavily on our successful development and commercialization of the product.
We depend heavily on the success of our clinical-stage product candidates, including the potential approval of PYRUKYND® for use in indications other than PK deficiency and in other jurisdictions. Clinical trials of our product candidates may not be successful for a number of important reasons. If we or our collaborators are unable to commercialize our product candidates or experience significant delays in doing so, our business will be materially harmed.
We may engage in in-licensing transactions or acquisitions that could disrupt our business, cause dilution to our stockholders or reduce our financial resources.
The outcome of preclinical studies and early clinical trials may not be predictive of the success of later clinical trials, and interim or topline results of clinical trials do not necessarily predict success in future clinical trials. The results of clinical trials of PYRUKYND® for the treatment of PK deficiency do not predict that PYRUKYND® will be efficacious in our clinical trials in other indications.
We may expend our limited resources to pursue a particular product candidate or indication and fail to capitalize on product candidates or indications that may be more profitable or for which there is a greater likelihood of success.
PYRUKYND®, or any of our product candidates that may receive marketing approval in the future, may be less effective than previously believed or cause undesirable side effects that were not previously identified in clinical trials or may fail to achieve the degree of market acceptance by physicians, patients, healthcare payors and others in the medical community necessary for commercial success, which could compromise our ability, or that of any collaborators, to market the product.
If we are unable to establish and maintain sales and marketing capabilities or enter into agreements with third parties to sell and market our products, we may not be successful in commercializing PYRUKYND® or our product candidates if they are approved.
We provide certain development estimates related to the development of PYRUKYND® and our product candidates. If we do not achieve our projected development estimates in the timeframes we announce and expect, the commercialization of our products may be delayed and, as a result, our stock price may decline.
We face substantial competition, which may result in others discovering, developing or commercializing products before or more successfully than we do. There are a number of large pharmaceutical and biotechnology companies that currently market and sell products or are pursuing the development of products for the treatment of the indications for which we are developing PYRUKYND® or our product candidates. Our competitors may develop products that are more effective, safer, more convenient or less costly than PYRUKYND® or any product candidates that we are developing or that would render PYRUKYND® or our product candidates obsolete or non-competitive.
We are singularly focused on products and product candidates for the treatment of rare diseases. As a result, we may be more susceptible to changing market conditions, including fluctuations and risks particular to the markets for patients with rare diseases, than a more diversified company, which could adversely affect our business, financial condition and results of operations.
If our existing capital is insufficient to fund our operating expenses and capital expenditures, we will need to raise capital, and if we are unable to raise capital when needed, we would be forced to delay, reduce or eliminate our product development programs or commercialization efforts.
We have historically incurred operating losses. We expect to incur losses in the future and may never achieve or maintain profitability. Our net loss for the year ended December 31, 2023 was $352.1 million, our net loss for the year ended December 31, 2022 was $231.8 million and our net income for the year ended December 31, 2021 was $1.6 billion. The net income we generated in the year ended December 31, 2021 was due to the sale of our oncology business to Servier in March 2021. As of December 31, 2023, we had an accumulated deficit of $822.6 million.
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We currently rely and expect to continue to rely on third parties for the manufacture of our product candidates for preclinical and clinical testing and for commercial supply of PYRUKYND® and any product candidate for which we may obtain marketing approval. Any performance failure on the part of our existing or future third-party manufacturers could delay clinical development, marketing approval or our commercialization efforts.
We rely and expect to continue to rely on third parties to conduct our clinical trials and some aspects of our research and preclinical testing, and those third parties may not perform satisfactorily, including failing to meet deadlines for the completion of such trials, research or testing.
We may depend on collaborations with third parties for the development and commercialization of our product candidates. If those collaborations are not successful, we may not be able to capitalize on the market potential of these product candidates.
If we are unable to obtain and maintain patent or trade secret protection for our medicines and technology, or if the scope of the patent protection obtained is not sufficiently broad, our competitors could develop and commercialize medicines and technology similar or identical to ours, and our ability to successfully commercialize our medicines and technology may be adversely affected. If we do not, or are unable to, obtain or maintain any issued patents for any of our most advanced product candidates, it could have a material adverse effect on our competitive position, business, financial condition, results of operations, and prospects.
Item 1. Business
General
We are a biopharmaceutical company committed to the fundamental transformation oftransforming patients’ lives through scientific leadership in the field of cellular metabolism, with the goal of making transformative, first- or best-in-class medicines. Our therapeutic areascreating differentiated medicines for rare diseases, with a focus on classical hematology. With a history of focus are cancer and rare genetic diseases, or RGDs, which are diseases that are directly caused by changes in genes or chromosomes, often passed from one generation to the next. Most RGDs are often associated with severe or life-threatening features. The incidence of a single RGD can vary widely but is generally very infrequent, usually equal to or less than one per 100,000 births. In both areas of cancer and RGDs, we are seeking to unlock the biology offocused study on cellular metabolism, aswe have a platform to create transformative therapies.
Our first commercial cancer product is IDHIFA®. In August 2017, the FDA granted our collaboration partner Celgene Corporation, or Celgene, approvaldeep and mature understanding of IDHIFA® for the treatment of adult patients with R/R AML, and an IDH2 mutation as detected by an FDA-approved test. IDHIFA®, an oral targeted inhibitor of the mutated IDH2 enzyme, is the first and only FDA-approved therapy for patients with R/R AML and an IDH2 mutation.
Our most advanced clinical cancer product candidates are ivosidenib, which targets mutated IDH1, and AG-881,this biology, which is a brain-penetrant pan-IDH mutant inhibitor. These mutations are found in a wide range of hematological malignancies and solid tumors. In December 2017, we submitted a new drug application, or NDA, to the FDA for ivosidenib for the treatment of patients with R/R AML and an IDH1 mutation. We plan to submit an MAA to the EMA for ivosidenib for IDH1 mutant-positive R/R AMLinvolved in the fourth quarterhealthy functioning of 2018.
Our next most advanced cancer product candidate is AG-270, an inhibitor of MAT2A. We submitted an investigational new drug application, or IND, for AG-270 in November 2017, and in December 2017 the FDA concluded that we may proceed with our planned phase 1 dose-escalation trial of AG-270 in multiple tumor types carrying a methylthioadenosine phosphorylase, or MTAP, deletion. We expect to initiate this trialnearly every system in the first quarterbody. Building on this expertise, these learnings can be rapidly applied to our clinical trials with the goal of 2018.developing medicines that can have a significant impact for patients. We accelerate the impact of our portfolio by cultivating connections with patient communities, healthcare professionals, partners and colleagues to discover, develop and deliver potential therapies for rare diseases.
Our most advanced preclinical cancer product candidate is an inhibitor of the metabolic enzyme DHODH. We plan to submit an IND for our DHODH inhibitor for the treatment of hematologic malignancies in the fourth quarter of 2018.Business Overview
Rare diseases
The lead product candidate in our RGD program, AG-348, targetsportfolio, PYRUKYND® (mitapivat), is an activator of both wild-type and mutant pyruvate kinase-Rkinase, or PK, enzymes for the potential treatment of hemolytic anemias. In February 2022, the U.S. Food and Drug Administration, or FDA, approved PYRUKYND® for the treatment of pyruvate kinase, or PK, deficiency. PK deficiency is a rare genetic disorder that often results in severe hemolytic anemia jaundice and lifelong conditions associatedin adults with chronic anemia and secondary complications due to inherited mutations in the pyruvate kinase enzyme within red blood cells, or RBCs. We intend to initiate two global, pivotal trials of AG-348 in PK deficiency in the first halfUnited States. In November 2022, we received marketing authorization from the European Commission for PYRUKYND® for the treatment of 2018: ACTIVATE-T, a single arm trial of approximately 20 regularly transfusedPK deficiency in adult patients is expected to initiate in the first quarterEuropean Union, or EU. In December 2022, we received marketing authorization in Great Britain for PYRUKYND® for the treatment of 2018,PK deficiency in adult patients under the European Commission Decision Reliance Procedure. In addition, we are currently evaluating PYRUKYND® in clinical trials for the treatment of thalassemia, sickle cell disease, or SCD, and ACTIVATE,in pediatric patients with PK deficiency. We are also developing (i) AG-946, a 1:1 randomized, placebo-controlled trialnovel PK activator, for the potential treatment of approximately 80 patients who do not receive regular transfusions, is expected to initiate inlower-risk myelodysplastic syndrome, or LR MDS, and hemolytic anemias, and (ii) AG-181, our phenylalanine hydroxylase, or PAH, stabilizer for the second quarterpotential treatment of 2018. We also expect to initiate a phase 2 proof of concept trial of AG-348 in thalassemia in the fourth quarter of 2018.phenylketonuria, or PKU.

In addition to the aforementioned development programs, in July 2023 we entered into a license agreement with Alnylam Pharmaceuticals, Inc., or Alnylam for the development and commercialization of products containing or comprised of an siRNA preclinical development candidate discovered by Alnylam and targeting the transmembrane serine protease 6, or TMPRSS6, gene and we intend to pursue development of a licensed product for the potential disease-modifying treatment of patients with polycythemia vera, or PV, a rare blood disorder.
Alnylam License Agreement
In accordance with the license agreement with Alnylam, in the year ended December 31, 2023, we made an up-front payment to Alnylam and recognized in-process research and development of $17.5 million. We will also pay Alnylam for certain expenses associated with the development of the TMPRSS6 gene. Additionally, we are seekingresponsible to advancepay up to $130.0 million in potential development and regulatory milestones, in addition to sales milestones as well as tiered royalties on annual net sales, if any, of licensed products, which may be subject to specified reductions and offsets. Because the acquired assets under the license agreement with Alnylam do not meet the definition of a numberbusiness in accordance with ASC 805, Business Combinations, we accounted for the agreement as an asset acquisition.
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Sale of Oncology Business to Servier and Sale of Contingent Payments
On March 31, 2021, we completed the sale of our oncology business, including TIBSOVO®, our clinical-stage product candidates vorasidenib, AG-270 and AG-636, and our oncology research programs, to Servier, for a payment of approximately $1.8 billion in cash at the areasclosing, subject to certain adjustments, and a payment of cancer metabolism, RGDs$200.0 million in cash, if, prior to January 1, 2027, vorasidenib is granted new drug application approval from the FDA with an approved label that permits vorasidenib’s use as a single agent for the adjuvant treatment of patients with Grade 2 glioma that have an isocitrate dehydrogenase 1 or 2 mutation (and, to the extent required by such approval, the vorasidenib companion diagnostic test is granted an FDA premarket approval), as well as a royalty of 5% of U.S. net sales of TIBSOVO® from the close of the transaction through loss of exclusivity, and metabolic immuno-oncology,a royalty of 15% of U.S. net sales of vorasidenib from the first commercial sale of vorasidenib through loss of exclusivity, with these royalties referred to as contingent payments and recognized as income when realizable. Servier also acquired our co-commercialization rights for Bristol Myers Squibb’s IDHIFA® and the right to receive a $25.0 million potential milestone payment under our prior collaboration agreement with Celgene Corporation, or MIO, a developing field which aims to modulate the activity of relevant immune cells by targeting critical metabolic nodes, thereby, enhancing the immune mediated anti-tumor response.
TheCelgene, and Servier is responsible for conducting certain clinical development strategyactivities within the IDHIFA® development program.
In October 2022, we sold our rights to future contingent payments associated with the royalty of 5% of U.S. net sales of TIBSOVO® from the close of the transaction through the loss of exclusivity to entities affiliated with Sagard Healthcare Partners, or Sagard, and recognized income of $127.9 million within the gain on sale of contingent payments line item in our consolidated statements of operations for all ofthe year ended December 31, 2022. We retain our product and development candidates includes a precision approach with initial study designs that allow for genetically or biomarker defined patient populations, enablingrights to the potential milestone payment and royalties from Servier if a new drug application for proofvorasidenib is approved by the FDA.
In November 2023, Servier announced that it was planning to submit a new drug application, or NDA, for vorasidenib for the treatment of concept early in clinical development, along with the potential for accelerated approval. Our ability to identify, validate and drug novel targets is enabled by a set of core capabilities. Key proprietary aspects of our core capabilities in cellular metabolism include our ability to measure the activities of numerous metabolic pathways in cells or tissues in a high throughput fashion and our expertise in “flux biochemistry.” This refersIDH-mutant diffuse glioma to the dynamic analysisFDA by the end of how metabolites, which are intermediates2023 and to the European Medicines Agency, or small molecule products of metabolism, accumulate or diminish as they are created or chemically altered by multiple networks of metabolic enzymes. Complex mathematical modeling of metabolic pathways, enzymatic activity and the flux of metabolites through metabolic enzymatic reactions within diseased tissues would allow us to identify novel biological parameters that can be measured to characterize a disease state or the effect of therapy, or biomarkers, and targets for drug discovery.EMA, in early 2024.
Our Strategy and Long-term Goals
As part of our long-term strategy, we have developed and articulated a strategic vision that delineates our expected evolution in light of our focus on rare diseases. We aim to build a multi-productsustainable, value-creating company, based on our expertise in cellular metabolism and classical hematology, that discovers, develops and commercializes first- or best-in-classdelivers differentiated medicines to treat cancerfor patients.
By 2026, our vision is to: establish a classical hematology franchise with PYRUKYND® approvals across PK deficiency, thalassemia and RGDs. Key elementsSCD; and expand our portfolio by advancing AG-946, AG-181 and our preclinical pipeline as well as through disciplined business development aligned with our core therapeutic focus areas and capabilities.
Our Core Values
Our values cultivate an environment that promotes collaboration, contribution, engagement and high regard for others’ points of view. This foundation helps our people push the boundaries of our strategy include:
Aggressively pursuing the development of novelscience and create transformative medicines, to transform the lives of patients with cancer and RGDs.

Maintaining our competitive advantage and focus in the field of cellular metabolism by building a research platform in cancer metabolism, RGDs and MIO.
Collaborating closely with the FDA and other regulatory bodies to aggressively pursue early registration potential for our product candidates, for example by utilizing a similar regulatory path for ivosidenib as Celgene did for IDHIFA®.
Continuing to build a product engine for cancer and RGDs to generate novel and important medicines.
Building a preeminent independent biopharmaceutical company by engaging in discovery, development and commercialization of our medicines.
Maintaining a commitment to precision medicine in drug development.
Our Guiding Principles
We aim to build a long-term company with a disciplined focus on developing medicines that transform the lives of patients with cancer and RGDs. We maintain a culture of high integrity that embraces the following guiding principles, which we believe will provide long-term benefits for all our stakeholders:stakeholders. Our connections – with each other and with external parties – fuel the development of new therapies for the people who need them. Our core values include:
FollowAim High: We set the bar high for ourselves, and we keep working to raise it. At our core, we’re guided by a deep respect for the science and do what is righta commitment always to act with the utmost integrity.
Come Together: We grow supportive relationships with patients and caregivers. We build trusting connections with collaborators. Together, we make a bigger impact than we ever could alone.
Embrace Differences: Because opportunities and insights come from anywhere and anyone, we honor all voices and encourage honest dialogue. We learn equally from success and failure, bringing an open mind and a flexible approach to everything we do.
Bring Your Whole Self: We know we make the biggest impact when each of us can contribute and lead in our own way.
Blaze New Trails: We ask the tough questions that can lead to groundbreaking scientific advances. We nurture a creative mindset and resourceful approach that spark life-changing innovations for patients.
Maintain a culture of incisive decision-making driven by deep scientific interrogation and “respectful irreverence.”
Foster a collaborative spirit that includes all employees regardless of function or level.
Leverage deep strategic relationships with our academic and commercial partners to improve the quality of our discovery and development efforts.
Cellular Metabolism
Cellular metabolism is involved in the healthy functioning of nearly every system in the body and refers to the set of life-sustaining chemical transformations within the cells of living organisms. The conversion of nutrients into energy via enzyme-catalyzed reactions allows organisms to grow and reproduce, maintain their structures, and respond to their environments. Additionally, metabolites serve as key regulators of diverse aspects of cellular biology, and pharmacologic targeting of metabolism can therefore have disease-modifying effects in a wide variety of pathologies. The chemical reactions of metabolism are organized into metabolic pathways, in which one chemical is transformed through a series of steps into another
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chemical, by a sequence of enzymes. Enzymes catalyze quick and efficient reactions, serve as key regulators of metabolic pathways, and respond to changes in the cell’s environment or signals from other cells. We believe our deep understanding of metabolic pathways within normal cells enables us to identify altered metabolic pathways within abnormal cells such as in rapidly proliferating cancers and RGDs, and our efforts in the field of MIO are focused on the research and development of immunotherapies against certain metabolic targets that exert their antitumor efficacy primarily via the immune system.
Cancer and cancer metabolism
Cancer is a disease characterized by unregulated cell growth. Cancer typically develops when the repair of genetic material in normal cells begins to fail and genes that regulate cell growth become disrupted. Carcinogens, or cancer causing agents, such as radiation, chemicals and hormones, can trigger changes to the genetic material of a cell, and typically prompt this disruption. Cells that have been disrupted may become cancerous, leading to changes in the cells’ DNA, and ultimately uncontrolled growth. Cancer cells can spread to other areas of the body, or metastasize, and form tumors, which can destroy normal tissue or organs. Risk factors for cancer include family history, age, diet, and exogenous factors, such as exposure to ultraviolet sunlight and smoking. Cancers can be classified in stages to document disease severity, measured in stages of I to IV, generally based on tumor size, involvement of lymph nodes, and metastases.
The most common methods of treating patients with cancer are surgery, radiation and drug therapy. A cancer patient often receives treatment with a combination of these methods. These treatment regimens are often associated with side effects, including fatigue, infection, nausea and vomiting and pain. Surgery and radiation therapy are particularly effective in patients in whom the disease is localized. Physicians generally use systemic drug therapies in situations in which the cancer has spread beyond the primary site or cannot otherwise be treated through surgery. The goal of drug therapy is to kill cancer cells or to damage cellular components required for rapid growth and survival of cancer cells. In many cases, drug therapy entails the administration of several different drugs in combination. Over the past several decades, drug therapy has evolved from non-specific drugs that kill both healthy and cancerous cells to drugs that target specific molecular pathways involved in cancer.

Cytotoxic chemotherapies
The earliest approach to cancer treatment was to develop drugs, referred to as cytotoxic drugs, which kill rapidly proliferating cancer cells through non-specific mechanisms, such as disrupting cell metabolism or causing damage to cellular components required for survival and rapid growth. While these drugs, (e.g., CYTOXAN®, Adriamycin®) have been effective in the treatment of some cancers they act in an indiscriminate manner, killing healthy as well as cancerous cells. Due to their mechanism of action, many cytotoxic drugs have a narrow dose range above which the toxicity causes unacceptable or even fatal levels of damage and below which the drugs are not effective in eradicating cancer cells.
Targeted therapies
The next approach to pharmacological cancer treatment was to develop drugs, referred to as targeted therapeutics, that target specific biological molecules in the human body that play a role in rapid cell growth and the spread of cancer. Targeted therapeutics are designed to preferentially kill cancer cells and spare normal cells, to improve efficacy and minimize side effects. The drugs are designed to either attack a target that causes uncontrolled growth of cancer cells because of either a specific genetic alteration primarily found in cancer cells but not in normal cells or a target that cancer cells are more dependent on for their growth in comparison to normal cells. Examples of effective targeted therapies include Herceptin®, Avastin® and Zelboraf®.
Emerging areas
Several new approaches to develop novel cancer treatments are underway. They include: treatment with drugs or other methods that stimulate the normal immune system to attack the cancer (immuno-oncology), including immunotherapies based on chimeric antigen receptor and T cell receptor technologies to genetically engineer T cells to recognize and kill cancer cells; antibody drug conjugates (e.g., Kadcyla®) that carry a powerful chemotherapy payload that is only released into the cancer cell; and drugs that target the changes in gene activity that occurs in cancer cells (epigenetics).
Cancer metabolism is an exciting field of biology that provides a fundamentally different approach to treating cancer. Cancers become addicted to certain fuel sources and inherently alter their cellular machinery to change how they consume and utilize nutrients. Cancer cells increase the transport of nutrients into the cell by 200-400 fold compared to normal cells while also mutating metabolic enzymes to generate metabolites that fuel growth and altering gene expression of enzymes to divert energy production. Collectively, these changes afford cancer cells the ability to generate the building blocks that drive tumor growth. Inhibiting key enzymes in cancer cell specific metabolic pathways has the potential to disrupt tumor cell proliferation and survival without affecting normal cells, thus providing a powerful new intervention point for discovery and development of novel targeted cancer therapeutics. Our research is directed at identifying such metabolic targets and discovering medicines against them.
Validation of the concept of cancer cell metabolic rewiring and excessive nutrient uptake comes from the widespread use of positron emission tomography, or PET, to detect cancers. This medical imaging technology relies on the uptake of nutrients, namely sugar, into cells. Patients are injected with a radioactively labeled form of sugar, which is more rapidly consumed by cancer cells given their profound requirement for nutrients relative to normal tissues. PET imaging precisely locates cancerous areas throughout the body and provides for both a diagnostic and prognostic tool throughout cancer therapy.
The metabolic rewiring of cancer cells can also be linked to specific genetic alterations in oncogenes (which are genes that transform normal cells into tumor cells) and tumor suppressor genes (which are genes that are anti-oncogenic) responsible for cell signaling. These mutations in signaling pathways can drive excessive uptake of nutrients and altered metabolic pathways, thereby causing cancer formation. This cross talk between cell signaling and metabolism offers multiple opportunities to treat cancer by combining our therapies directed against metabolic enzymes with existing or emerging standards of care.
Metabolic immuno-oncology
There is increasing evidence that cellular metabolism plays an important role in modulating key components of the immune system. One of our areas of focus is MIO, a developing field which aims to modulate the activity of relevant immune cells by targeting critical metabolic nodes, thereby, enhancing the immune mediated anti-tumor response. We are leveraging our proprietary metabolic, target discovery and validation platforms with the goal of unlocking promising targets in this field. The immune system’s ability to attack tumors is highly regulated by cellular metabolism. We believe that the emerging field of MIO has great potential to provide novel insights and targets for cancer immunotherapy in solid and hematologic malignancies. Our efforts in the MIO field are governed by our 2016 global research and collaboration agreement with Celgene, described in more detail below.

Rare genetic diseases
RGDs, a subset of orphan genetic metabolic diseases,Diseases are a broad group of more than 600typically considered rare diseases caused by mutations of single metabolic genes. In these disorders, the defect of a single metabolic enzyme disrupts the normal functioning of a metabolic pathway, leading to either aberrant accumulation of “upstream” metabolites which may be toxic or interfere with normal function or reduced ability to synthesize essential “downstream” metabolites or other critical cellular components. RGDs are also referred to as congenital metabolic diseases or rare genetic disorders of metabolism.
Most of these diseases are rare or ultra-rare orphan diseases, often with severe or life-threatening features. A disorder is considered orphan if it affectsthey affect fewer than 200,000 people in the United States, or fewer than five per 10,000 people in France, Germany, Italy, Spain, United Kingdom, or the European Union, or E.U. In a study in British Columbia, the overall incidence of RGDs was estimated to be 70 per 100,000 live births or one in 1,400 births, overall representing more than approximately 15% of single gene disorders in the population. Incidence of a single RGD can vary widely but is generallyEU5. Many rare usually equal to or less than one per 100,000 births. Many RGDsdiseases are likely to be under-diagnosed given the lack of available therapies or diagnostics, and the rarity of the condition.condition, or limited understanding of how the disease genetics relate to the disease phenotype. It has been shown that small molecule therapies able to specifically correct genetic deficiencies and their associated organ dysfunction may have application in conditions that arise independent of patient genetics but for which identical organ dysfunction occurs. For example, a treatment for a hereditary hemolytic anemia may find direct application in the treatment of a secondarily acquired hemolytic anemia.
Many rare diseases carry severe or life-threatening features. In many of these disorders, the defect of single or multiple genes leads to a deficient expression or function in one or several gene products which collectively manifest in organ dysfunction. As these conditions are by nature congenital and frequently hereditary, they are often detected either by genetic testing or phenotypic diagnosis in newborns or in early childhood. A typical course of many such diseases is inexorable deterioration until death or significant irreversible life-long disability and/or suffering.
Current treatment options for these disorders are generally limited. DietSevere and sustained diet modification or nutrient supplementation can be beneficial in some RGDs.certain rare diseases. Several of these disorders, from a group known as lysosomal storage diseases, have been treated successfully with enzyme replacement therapy, or ERT, the therapeutic administration of a functional version of the defective enzyme. Examples of ERTs for lysosomal storage disorders include Fabrazyme®Fabrazyme® for Fabry disease, Myozome®Myozome® for Pompe disease, Cerezyme®Cerezyme® for Gaucher disease, and Elaprase®Elaprase® for Hunter syndrome. In addition, treatment of polygenic conditions such as achondroplasia by Vosoritide® and the monogenic condition, spinal muscular atrophy by gene therapy with Zolgensma® and Spinraza® represent novel technologic approaches to addressing rare diseases.
Unfortunately, mostMost mutations driving RGDsrare diseases are intracellular and not amenable forto corrective treatment with enzyme replacement therapies. AsERTs. Novel technologic approaches such as gene therapy are also being tested in a result, despiteminority of conditions and are technologies with limited application based on cost, complexity and patient selection factors. Despite the promising progress made for patients with a small group of theserare diseases, the vast majority of patients with RGDsthese diseases have few therapeutic options, available, and the standard of care for many such conditions is palliative, meaning treatment of symptoms with no effect on underlying disease mechanisms. Our goal is to develop mechanistically specific, small molecule approaches with the potential to have disease modifying and long-term effects, rather than palliative effects. We are taking a novel small molecule approach to correct the metabolic defects within diseased cells with a goal of developing transformative medicines for patients.
We focusClassical hematology
Classical hematology refers to the study and treatment of blood disorders that are not cancerous, including thrombotic and hemorrhagic disorders, anemia, thrombocytopenia, disorders of iron metabolism and hemoglobin disorders. Many of these diseases are debilitating, have a negative impact on RGDs that sharepatients’ quality of life and are associated with severe complications and/or shortened life expectancy. Despite the following common setsignificant need for novel therapies and improved patient care, there is a shortage of features:
single gene defect;
severe clinical presentationresearch and trained specialists in the field of classical hematology, and patients with evidence that disease damage is progressive but potentially reversible;
adequate number of patients for prospective clinical trials;these disorders are often underserved and
an assessment experience health disparities and inequity. In addition, even in diseases in which some progress has been made, large subsets of the target, based upon a detailed mutational, structural, and metabolomic analysis, to determine if a small molecule approach to correcting the disease is possible.
Precision Medicine Approach
Our understanding of cellular metabolism within diseased tissues enables the development of methods to measure the effect of a drug on the target of interest and the patient, or pharmacodynamic markers, and patient selection strategies for clinical development based on genetic markers and/or metabolic biomarkers. Utilizing our approach we identify altered metabolic pathways within abnormal cells. Altered metabolic pathways generate disease-specific metabolic fingerprints, comprising patterns of metabolite levels, which are the amounts of particular metabolites that can be exploited in both discovery and development of novel therapeutics. Metabolites make ideal biomarkers because they are readily measured in the target tissues and blood. Metabolic biomarkers, along with genetic markers, can identify appropriate patients for clinical trials, serve as pharmacodynamics markers to characterize medicine/target engagement in patients, and permit the monitoring of patient response to therapy.
We will generally progress our drug candidates forward into phase 1 clinical trials if we have the ability to select patients who are most likely to respond to a given therapy based on biomarkers, for example, genetic or metabolic markers. While many factors are considered critical to maximize the probability of technical success in the drug development process, perhaps none is more important than identifying highly specific and selective molecules aimed at the best possible targets for therapy coupled with the patients most likely to respond to that therapy.may remain underserved. Our goal is to develop increasing confidencetransformative oral treatments for patients with various classical hematological disorders through broad clinical development programs in order to address the target and the patient population prior to entering human clinical trials and then initiate those first human trials inunmet needs of a patient population that has been selected based on target dependence using a genetic marker and/or biomarker. This approach, known as personalized or precision medicine, is used in the industry to lead to the potential for clear prooflarge range of concept in early human trials, along with the potential for accelerated approval.

patients.
Our Development Programs
We believe that leveraging our core capabilities in cellular metabolism combined with a precision medicine approachour singular focus on rare diseases and our differentiated expertise in classical hematology has significantly enhanced our ability to buildadvance new therapeutic candidates and bring innovative medicines to patients in need. We have a researchproven track record of developing new therapeutic approaches and development engine that is focused in the therapeutic areas of cancer and RGDs. This engine has permitted us to discovermultiple proprietary first-in-class orally available small molecules as potential lead product candidates for eachmolecules.
5

The following summarizes our approved product and most advanced clinical product candidates, as of February 1, 2018, each of which is described in further detail below:
Targeting Mutated IDH for the Treatment of Cancer
The IDH protein is a critical enzyme in the citric acid cycle, also known as the tricarboxylic acid cycle or Krebs cycle. The Krebs cycle is centrally important to many biochemical pathways and is one of the earliest established components of cellular metabolism. The Krebs cycle converts an essential cellular metabolite called isocitrate into another metabolite, alpha-ketoglutarate (a-ketoglutarate), both of which are critically important for cellular function and the creation of energy. In

humans, there are three forms of the IDH enzyme, IDH1, IDH2, and IDH3, but only IDH1 and IDH2 appear to be mutated in cancers. IDH1 and IDH2 catalyze the same reaction but in different cellular compartments: IDH1 is found in the cytoplasm of the cell and IDH2 in the mitochondria. Tumor cells are generally observed to carry either an IDH1 or IDH2 mutation.
Using our proprietary metabolic platform, we and our collaborators examined the mutated pathway and discovered that the mutated IDH enzymes had adopted a novel “gain of function” activity that allows only the mutated IDH enzyme to produce large amounts of a metabolite called 2-hydroxygluturate, or 2HG. We have shown that the excessive levels of the metabolite 2HG produced by the tumor fuel cancer growth and survival via multiple cellular changes that lead to a block in cell maturation, or differentiation. We have shown that inhibition of these mutated proteins could lead to clinical benefit for the subset of cancer patients whose tumors carry these mutations. By reducing elevated 2HG levels, our IDH inhibitors reverse the block in cellular differentiation, allowing tumorous cells to differentiate into normally functioning cells in patients with acute myeloid leukemia, or AML. We have identified selective development candidates that separately target and inhibit the mutated forms of IDH1 and IDH2. To date, our clinical data with IDHIFA® and ivosidenib, our lead inhibitors of mutant IDH2 and IDH1, respectively, demonstrate evidence of cellular differentiation, normalization of cell counts and mutational clearance in the bone marrow and blood, a mechanism of response that is consistent with preclinical studies, including substantial reduction of plasma 2HG levels. This targeted differentiation effect is distinct from that seen with traditional cytotoxic chemotherapeutics, which lead to cell death, commonly used to treat cancer. Our goal is to establish our IDH mutation inhibitors as a cornerstone of AML therapy spanning all treatment lines.
To date, IDH1 and IDH2 mutations have been found to be prevalent in a broad range of advanced hematologic and solid tumors. The following tables summarize our current estimates on the occurrence of IDH2 and IDH1 mutations in certain hematologic and solid tumors. We believe our estimates may expand as more cancer treatment centers screen for these IDH mutations.
MutationIndications% with IDH mutations
IDH1AML~6-10%
Cholangiocarcinoma~14%
Low grade glioma~80%
IDH2AML~9-13%
Based on literature analysis; estimates will continue to evolve with additional future data.
IDHIFA®
IDHIFA® is an orally available, selective, potent inhibitor of the mutated IDH2 protein, making it a highly targeted therapeutic candidate for the treatment of patients with cancers that harbor IDH2 mutations, including those with AML, who have a historically poor prognosis. In August 2017, the FDA granted Celgene approval of IDHIFA® for the treatment of adult patients with R/R AML and an IDH2 mutation as detected by an FDA-approved test.
Celgene maintains worldwide development and commercial rights to IDHIFA® and will fund the future development and commercialization costs related to this program. Under the 2010 Agreement described below, Celgene is responsible for all development costs for IDHIFA®, and we are eligible to receive up to $95.0 million in milestone payments, which are comprised of: (i) up to $70.0 million in milestone payments upon achievement of specified ex-U.S. regulatory milestone events and (ii) a $25.0 million milestone payment upon achievement of a specified commercial milestone event. Additionally, we are eligible to receive royalties at tiered low-double digit to mid-teen percentage rates on any net sales of IDHIFA®. In January 2016, we earned a $25.0 million milestone payment upon initiation of the IDHENTIFY clinical trial, as described below. In addition to contributing our scientific and translational expertise, we will continue to conduct some clinical development and regulatory activities within the IDHIFA® development program under the 2010 Agreement. We also have co-commercialization rights to provide up to one-third of the field-based commercialization efforts and will be reimbursed for those efforts.
We continue to evaluate IDHIFA® in clinical trials in patients with hematological cancers with IDH2 mutations, which are led and funded by Celgene. To date, all clinical data reported by us and our collaborators in hematological cancers highlight that the mechanism of response is consistent with preclinical studies, including substantial reduction of plasma 2HG levels, as well as evidence of cellular differentiation and normalization of cell counts in the bone marrow and blood. This differentiation effect is distinct from that seen with traditional chemotherapeutics commonly used to treat AML. The FDA has granted orphan drug designation for IDHIFA® for treatment of patients with AML and fast track designation for treatment of patients with AML that harbor an IDH2 mutation, and the EMA granted orphan drug designation for IDHIFA® for the treatment of AML.

We and Celgene are evaluating IDHIFA® in the following clinical trials:
Phase 1/2 clinical trial
The FDA’s approval of IDHIFA® in R/R AML was based on clinical data from an open-label, single-arm, multicenter, two-cohort phase 1/2 clinical trial of adult patients with R/R AML and an IDH2 mutation. The safety of IDHIFA® was evaluated in 214 patients in this trial. The median duration of exposure to IDHIFA® was 4.3 months (range 0.3 to 23.6). The 30 and 60-day mortality rates observed with IDHIFA® were 4.2% (9 of 214 patients) and 11.7% (25 of 214 patients), respectively. In the clinical trial, 14% of patients treated with IDHIFA® experienced differentiation syndrome, which can be fatal if not treated. The most common adverse events, or AEs, seen in greater 20% of patients were nausea, vomiting, diarrhea, elevated bilirubin and decreased appetite. Serious adverse events, or SAEs, were reported in 77.1% of patients. The most frequent serious adverse reactions (greater than 2% of patients) were leukocytosis, diarrhea, nausea, vomiting, decreased appetite, tumor lysis syndrome, and differentiation syndrome. More than half (52%) of the treated patients were refractory to previous therapy. The efficacy of IDHIFA® was evaluated in 199 adult patients in the clinical trial. IDHIFA® was given orally at a starting dose of 100 mg daily until disease progression or unacceptable toxicity. Dose reductions were allowed to manage side effects. Patients had a median age of 68 years (range of 19 to 100) and received a median of two prior anticancer regimens (ranging from one to six). IDHIFA® demonstrated a combined CR or complete response with partial hematologic improvement, or CRh, rate of 23% (n=46) (95% CI: 18%, 30%). Median duration of CR/CRh was 8.2 months (95% CI: range 4.3, 19.4). For patients who achieved a CR/CRh, the median time to first response was 1.9 months (range, 0.5 to 7.5 months) and the median time to best response of CR/CRh was 3.7 months (range, 0.6 to 11.2 months). Of patients achieving a CR/CRh, 85% (39 of 46 patients) did so within six months of initiating IDHIFA®. A CR is determined by using well-established criteria, which requires no evidence of leukemia in the bone marrow and blood accompanied by full restoration of all blood counts to normal ranges. CRh is defined as less than 5% of blasts in the bone marrow, no evidence of disease and partial recovery of peripheral blood counts (platelets >50,000/lL and ANC >500/lL). Among the 157 patients who were dependent on RBCs and/or platelet transfusions at baseline, 53 (34%) became independent of RBCs and platelet transfusions during any 56-day post-baseline period. Of the 42 patients who were independent of both RBCs and platelet transfusions at baseline, 32 (76%) remained transfusion independent during any 56-day post-baseline period.
Phase 1b frontline combination trial
IDHIFA® is being evaluated in a phase 1b, multicenter, international, open-label clinical trial, conducted by us, to evaluate the safety and clinical activity of IDHIFA® or ivosidenib in combination with induction and consolidation therapy in patients with newly diagnosed AML with an IDH2 or IDH1 mutation who are eligible for intensive chemotherapy. The trial is evaluating continuous dosing for up to one year with IDHIFA® administered at an initial oral dose of 100 mg once daily in patients with an IDH2 mutation or ivosidenib administered at an initial oral dose of 500 mg once daily in patients with an IDH1 mutation. IDHIFA® or ivosidenib is administered with two types of AML induction therapies (cytarabine with either daunorubicin or idarubicin) and two types of AML consolidation therapies (mitoxantrone with etoposide [ME] or cytarabine). The trial is currently enrolling patients.
In December 2017, we presented interim data from this trial at ASH 2017. As of the August 1, 2017 data cut-off, in the IDHIFA® arm, the most common grade 3 or higher non-hematologic AEs during the induction period were febrile neutropenia (63%), blood bilirubin increase (9%), hypertension (9%) and bacteremia (9%). The 30- and 60-day mortality rates were 5% and 7%, respectively. There was one dose-limiting toxicity in the IDHIFA® arm consisting of persistent Grade 4 thrombocytopenia lasting beyond 42 days from the start of induction. The median time to absolute neutrophil count, or ANC, recovery (greater than 500/µL) was 34 days (95% CI 29,35). The median time to platelet recovery (greater than 50,000/µL) was 33 days (95% CI 29,50). In the IDHIFA® arm the overall best response rate of combined CR and CRi/CRp, was 62% (31 of 50 response-evaluable patients); among 27 response-evaluable patients with de novo AML, the overall best response rate of combined CR and CRi/CRp was 67% (18 of 27 patients); and among 23 response-evaluable patients with secondary AML, the overall best response rate of combined CR and CRi/CRp was 57% (13 of 23 patients). A CRp, or complete remission with incomplete platelet recovery, means all the criteria for CR are met except that platelet counts are outside of the normal range. Platelets are one of the three major types of blood cells. A CRi, or complete remission with incomplete neutrophil or platelet recovery, means there is no evidence for leukemia in the marrow but the neutrophils, a subset of white blood cells responsible for fighting bacterial infections, are outside the normal range. The interim reported results from the ivosidenib arm of this trial are discussed below under “Ivosidenib - Phase 1(b) frontline combination trial.”
Phase 1/2 frontline combination trial
IDHIFA® is being evaluated in a phase 1/2 frontline combination clinical trial, conducted by Celgene, of either IDHIFA® or ivosidenib in combination with VIDAZA® (azacitidine) in newly diagnosed AML patients not eligible for intensive chemotherapy, with a phase 1 component to determine the safety of the combinations, followed by a phase 2 randomized component evaluating the safety and clinical activity of the IDHIFA® investigational combination versus single-agent VIDAZA® using a primary endpoint of overall response rate, or ORR. In the phase 1 component of the trial, patients received

100 mg (n=3) or 200 mg (n=3) of IDHIFA® daily plus VIDAZA® or 500 mg of ivosidenib (n=11) plus VIDAZA®. The trial has completed the phase 1 component and is currently enrolling in the phase 2 component.
In December 2017, we presented interim data from this trial at ASH 2017. As of the September 1, 2017 data cut-off, the median age of patients treated in the IDHIFA® arm was 68 (five out of six patients were 65 years old or older), and the most common grade 3-4 hematologic AE was neutropenia (33%), with thrombocytopenia, febrile neutropenia, anemia, lymphocyte count decreased and white blood cell count decreased all with one event (17% each), and the most common grade 3-4 non-hematologic AEs were pneumonia (33%) and hyperbilirubinemia (33%). IDH differentiation syndrome was reported in one patient. In the IDHIFA® arm, four of six patients had a response, including two CRs, one partial remission, or PR, and one morphologic leukemia-free state, or MLFS. A PR means all the criteria for CR are met except that the immature defective blood cells, or leukemia, in the bone marrow are in the 5% to 25% range and have been decreased by at least 50% over pretreatment. The interim reported results from the ivosidenib arm of this trial are discussed below under “Ivosidenib - Phase 1/2 frontline combination trial.”
IDHENTIFY
IDHIFA® is being evaluated in IDHENTIFY, an international phase 3, multi-center, open-label, randomized clinical trial, conducted by Celgene, designed to compare the efficacy and safety of IDHIFA® versus conventional care regimens in patients 60 years or older with IDH2 mutant-positive AML that is refractory to or relapsed after second- or third-line therapy. In January 2016, in conjunction with the initiation of the IDHENTIFY clinical trial, we received a milestone payment of $25.0 million from Celgene pursuant to the 2010 Agreement. This trial is currently enrolling patients and we have not yet presented any clinical data from this trial.
Phase 3 frontline combination trial
We plan to support, with Celgene, the initiation of an intergroup sponsored, global, registration-enabling phase 3 trial combining ivosidenib or IDHIFA® and standard induction (7+3) and consolidation chemotherapy with a primary endpoint of event-free survival in frontline AML patients with an IDH1 or IDH2 mutation in the fourth quarter of 2018. The trial is expected to enroll approximately 500 patients with an IDH1 mutation and approximately 500 patients with an IDH2 mutation.
Ivosidenib
Ivosidenib is our wholly owned, orally available, selective, potent inhibitor of the mutated IDH1 protein, making it a highly targeted therapeutic candidate for the treatment of patients with cancers that harbor IDH1 mutations. Mutations in IDH1 have been identified in difficult to treat hematologic and solid tumor cancers, including AML, chondrosarcoma, cholangiocarcinoma and glioma where both the treatment options and prognosis for patients are poor. The FDA has granted us fast track designation to ivosidenib for treatment of patients with AML that harbor an IDH1 mutation and orphan drug designation for ivosidenib for treatment of patients with AML. The FDA has also granted fast-track designation to ivosidenib for treatment of patients with previously treated, unresectable or metastatic cholangiocarcinoma with and IDH1 mutation. In December 2017, we submitted an NDA to the FDA for ivosidenib for the treatment of patients with R/R AML and an IDH1 mutation. We plan to submit an MAA to the EMA for ivosidenib for IDH1 mutant-positive R/R AML in the fourth quarter of 2018.
We are evaluating ivosidenib in the following clinical trials:
Phase 1 clinical trial (advanced hematologic malignancies)
Ivosidenib is being evaluated in a phase 1 multicenter, open-label, dose-escalation and expansion clinical trial, designed to assess its safety, clinical activity and tolerability as a single agent in patients with advanced hematologic malignancies with an IDH1 mutation. Four expansion cohorts have been added to the trial. The first cohort is evaluating 125 AML patients who are in second or later relapse, are refractory to second-line induction or reinduction treatment, or have relapsed after allogeneic transplantation. The second cohort is evaluating 25 untreated AML patients. The third cohort is evaluating 25 patients with other non-AML IDH1 mutant-positive relapsed or refractory advanced hematologic malignancies. The fourth cohort is evaluating patients with relapsed IDH1 mutant-positive AML not eligible for the first arm or standard of care chemotherapy. Ivosidenib is administered at a 500 mg once daily oral dose, in 28-day cycles. Enrollment to the trial is closed.
In December 2017, we presented interim clinical data from 258 patients treated with ivosidenib in the dose escalation and expansion arms of the trial at ASH 2017. Doses were administered from 200 mg to 1,200 mg total daily doses in dose escalation and 500 mg daily in dose expansion. A maximum tolerated dose, or MTD, was not reached in the dose escalation portion of the trial. As of the May 12, 2017 data cut-off, a safety analysis conducted for all 258 treated patients showed that ivosidenib continues to demonstrate a favorable safety profile. The most common AEs regardless of causality were diarrhea (33.3%), leukocytosis (30.2%), nausea (29.5%), fatigue (28.7%) and febrile neutropenia (25.2%). The data included 125 R/R AML patients who were enrolled at least six months prior to the data-cutoff, comprised of 92 patients from arm 1 of the expansion and 33 patients from the dose-escalation who met the eligibility criteria for arm 1 and received ivosidenib at 500 mg once daily. Among these 125 R/R AML patients, 8% reported grade ³3 leukocytosis, which was managed with hydroxyurea (no

cases were fatal), 8% reported grade 3 QT prolongation (ivosidenib was reduced in one patient, and no cases were grade 4 or fatal), and 9.6% reported IDH differentiation syndrome, which was managed with corticosteroids and diuretics (no cases were grade 4 or fatal). Data from 125 R/R AML patients demonstrated a combined CR and CRh rate of 30.4% (95% CI 22.5, 39.3), which is the primary endpoint of the study. The CR rate was 21.6% (27 of 125 patients) (95% CI 14.7, 29.8) and the CRh rate was 8.8% (11 of 125 patients). The ORR among the R/R AML patients was 41.6% (52 of 125 patients), and median duration of response was 9.3 months (95% CI 5.6, 18.3) for patients who achieved a CR, 8.2 months (95% CI 5.5, 12.0) for patients who achieved a CR/CRh and 6.5 months (95% CI 4.6, 9.3) for all patients who responded. The median time to first response was 1.9 months (0.8-4.7) for all patients who responded, median time to CR was 2.8 months (0.9-8.3) for patients who achieved a CR, and median time to CR/CRh was 2.7 months (0.9-5.6) for patients who achieved a CR/CRh. At the time of the data cut-off, median OS as observed in the study had not yet been reached for patients who achieved a CR/CRh. OS was 9.3 months (95% CI 3.7, 10.8) for non-CR/CRh responders, 3.9 months (95% CI 2.8, 5.8) for non-responders, and 8.8 months (95% CI 6.7, 10.2) overall. Of the patients who were transfusion dependent at baseline and achieved a CR, 100% became independent of platelet transfusions and 84.6% became independent of RBC transfusions during any 56-day post baseline period. Of the patients who were transfusion dependent at baseline and achieved a CRh, 71.4% became independent of platelet transfusions and 75.0% became independent of RBC transfusions during any 56-day post baseline period. Transfusion independence was also seen among non-CR/CRh responders and non-responders. Of the patients who were transfusion dependent at baseline and were non-CR/CRh responders, 58.3% became independent of platelet transfusions and 50% became independent of RBC transfusions during any 56-day post-baseline period. Of those who were transfusion dependent at baseline and were non-responders, 16.7% became independent of platelet transfusions and 15.4% became independent of RBC transfusions during any 56-day post-baseline period. Non-CR/CRh responders include patients with CRi, CRp and MLFS who are not CRh. An efficacy analysis was also presented for 34 untreated AML patients not eligible for standard of care therapies whose starting dose was 500 mg daily and 12 myelodysplastic syndrome, or MDS, patients in expansion cohorts whose starting dose was 500 mg daily. Data from 34 untreated AML patients demonstrated a 55.9% ORR and a CR rate of 20.6%. The median duration of response was 9.2 months (95% CI 1.9, NE), and median duration of CR has not yet been reached. Data from 12 MDS patients demonstrated a 91.7% ORR and a CR rate of 41.7%.
Phase 1b frontline combination trial
As discussed above, ivosidenib is being evaluated in a phase 1b, multicenter, international, open-label clinical trial to evaluate the safety and clinical activity of IDHIFA® or ivosidenib in combination with induction and consolidation therapy in patients with newly diagnosed AML with an IDH2 or IDH1 mutation who are eligible for intensive chemotherapy.
In December 2017, we presented interim data from this trial at ASH 2017. As of the August 1, 2017 data cut-off, in the ivosidenib arm, the most common grade 3 or higher non-hematologic AEs during the induction period were febrile neutropenia (60%), blood bilirubin increase (9%), hypertension (9%), colitis (9%), increased alanine aminotransferase (9%) and increased aspartate aminotransferase (9%). The 30- and 60-day mortality rates were both 6%, and there were no dose-limiting toxicities. The median time to ANC recovery (greater than 500/µL) was 28.5 days (95% CI 27,34). The median time to platelet recovery (greater than 50,000/µL) was 28 days (95% CI 26,34). In the ivosidenib arm, the overall best response rate of combined CR and CRi/CRp was 77% (23 of 30 response-evaluable patients); among 21 patients with de novo AML, the overall best response rate of combined CR and CRi/CRp was 91% (19 of 21 patients); and among nine patients with secondary AML, the overall best response rate of combined CR and CRi/CRp was 44% (four of nine response-evaluable patients). The interim reported results from the IDHIFA® arm of this trial are discussed above under “IDHIFA® - Phase 1(b) frontline combination trial.”
Phase 1/2 frontline combination trial
As discussed above, ivosidenib is being evaluated in a phase 1/2 frontline combination clinical trial, conducted by Celgene, of either IDHIFA® or ivosidenib in combination with VIDAZA® (azacitidine) in newly diagnosed AML patients not eligible for intensive chemotherapy.
In December 2017, we presented interim data from this trial at ASH 2017. As of the September 1, 2017 data cut-off, the median age of patients treated in the ivosidenib arm was 76 (all 65 years old or older), and the most common grade 3-4 hematologic AEs were anemia (18%), febrile neutropenia (18%), neutropenia (9%) and thrombocytopenia (9%), and the most common grade 3-4 non-hematologic AE was pneumonia (18%). IDH differentiation syndrome was reported in one patient. In the ivosidenib arm eight of 11 patients had a response, including four CRs, one CRi, one PR and two MLFSs.
AGILE
Ivosidenib is being evaluated in AGILE, a global, registration-enabling phase 3 clinical trial, combining ivosidenib and VIDAZA® in newly diagnosed AML patients with an IDH1 mutation who are ineligible for intensive chemotherapy. The trial has a primary endpoint of overall survival. The trial is currently open for enrollment and we expect to complete enrollment in 2021.

Phase 3 frontline combination trial
As discussed above, we plan to support, with Celgene, the initiation of an intergroup sponsored, global, registration-enabling phase 3 trial combining ivosidenib or IDHIFA® and standard induction (7+3) and consolidation chemotherapy with a primary endpoint of event-free survival in frontline AML patients with an IDH1 or IDH2 mutation in the fourth quarter of 2018.
Phase 1 clinical trial (advanced solid tumors)
Ivosidenib is being evaluated in a phase 1 multicenter, open-label, dose-escalation and expansion clinical trial, designed to assess its safety, clinical activity and tolerability as a single agent in patients with advanced solid tumors with an IDH1 mutation, including glioma, cholangiocarcinoma, and chondrosarcoma. Enrollment is now complete for four expansion cohorts of 25 patients each in (i) low grade glioma with at least six months of prior scans to assess volumetric changes, (ii) second-line cholangiocarcinoma, (iii) high grade, or metastatic, chondrosarcoma, and (iv) other solid tumors with an IDH1 mutation, who will receive the recommended dose of 500 mg of ivosidenib once daily.
In June 2017, we reported updated interim data from the dose escalation and dose expansion cohorts of our ongoing phase 1 clinical trial evaluating ivosidenib in patients with IDH1 mutant-positive cholangiocarcinoma at the American Society of Clinical Oncology (ASCO) Annual Meeting in Chicago, Illinois. As of the March 10, 2017 data cut-off, 73 patients with IDH1 mutant positive cholangiocarcinoma had been treated with single agent ivosidenib in the dose escalation (n=24) and expansion cohorts (n=49). Thirteen patients remained on treatment. Ivosidenib was administered at the following dose levels and schedules in the dose-escalation cohort: 100 mg twice daily, and 300, 400, 500, 800 and 1200 mg once a day over a 28 day cycle length. In the dose expansion cohort, patients received 500 mg once a day, which was the selected dose for the ongoing Phase 3 ClarIDHy trial, described below. Among the cholangiocarcinoma population in the trial, the median age is 60 (ranging from 32 to 81). Sixty-five patients had intrahepatic cholangiocarcinoma and eight had extrahepatic disease. The median number of prior systemic therapies was two (ranging from one to five) and 97% of patients received a prior gemcitabine-based chemotherapy regimen. A safety analysis conducted for all 73 treated patients as of the data cut-off demonstrated that ivosidenib was well-tolerated with a favorable safety profile in IDH1 mutant positive cholangiocarcinoma patients. No dose limiting toxicities or treatment-related deaths were observed. The majority of AEs reported were mild to moderate, with the most common regardless of causality being fatigue, nausea, diarrhea and decreased appetite. Four patients experienced drug-related AEs of at least grade 3: two at the 500 mg dose level, fatigue (n=1) and blood alkaline phosphatase increases (n=1), and two at the 1200 mg dose level, fatigue (n=1) and blood phosphorous decreases (n=1). One patient had a dose reduction for a grade 2 AE of worsening leg cramps that was considered to be possibly drug-related. Efficacy data from all 73 treated patients as of the data cut-off showed four patients (5%) experienced a confirmed partial response (one at 300 mg daily and three at 500 mg daily). A partial response is defined as at least a 30% decrease in the sum of diameters of target lesions, taking as reference the baseline sum diameters according to the Response Evaluation Criteria in Solid Tumors (RECIST v1.1). Forty-one patients (56%) experienced stable disease. Landmark analyses of progression free survival, or PFS, at six and 12 months were 38.5% and 20.7% respectively. The median PFS was 3.8 months (95% CI 3.6, 7.3). Ivosidenib treatment inhibited plasma 2HG to within levels found in healthy volunteers, and also reduced 2HG in tumor biopsies, with 2HG levels in plasma and tumor biopsies showing a positive correlation. Pathology review of on-study tumor biopsies were conducted in a patient achieving a partial response, which showed morphologic changes suggestive of cellular differentiation which is consistent with the proposed mechanism of action of ivosidenib.
In November 2017, we reported updated interim data from the dose expansion cohort of our ongoing phase 1 clinical trial evaluating ivosidenib in patients with progressive low-grade IDH1 mutant-positive glioma at the Society for Neuro-Oncology Annual Meeting in San Francisco, California. As of the May 12, 2017 data cut off, 35 patients (11 from dose escalation, 24 from dose expansion) with non-enhancing glioma had been treated with single agent ivosidenib. Eighteen patients (51%) remained on treatment. Twenty-four patients had World Health Organization (WHO) classified grade 2 tumors, eight had grade 3 tumors, one had a grade 4 tumor and two were unknown. Patients received daily doses of ivosidenib ranging from 300 mg to 900 mg. Twenty-eight patients received a daily dose of 500 mg, which was selected as the expansion dose. The median age of these patients is 38 (ranging from 21 to 71). The median treatment duration was 16 months (ranging from 1.4 to 27.1 months). The median number of prior therapies was two (ranging from one to five), and the median duration of last systemic therapy was 9.6 months. Sixty-three percent of patients had previously received temozolomide and 57% percent had previously received radiotherapy. A safety analysis conducted for all 35 treated non-enhancing glioma patients as of the data cut-off demonstrated that ivosidenib was well-tolerated with a favorable safety profile in glioma patients. No dose limiting toxicities were observed. The majority of adverse events reported by investigators were mild to moderate, with the most common being headache, diarrhea, nausea and vomiting. There were 5 patients with SAEs and all were deemed unrelated to study treatment. Efficacy data from all 35 non-enhancing glioma patients as of the data cut-off showed that two patients had a minor response by investigator assessment according to the Response Assessment in Neuro-Oncology for low grade glioma (RANO-LGG) and 29 (83%) patients had stable disease. The median PFS for all non-enhancing patients was 13 months, and the median PFS for Grade 2 patients (n=24) had not been reached. For patients in the expansion arm (n=24), the average six-month tumor growth was 24% prior to treatment and 11% following treatment with ivosidenib.

ClarIDHy
Ivosidenib is being evaluated in ClarIDHy, a registration-enabling phase 3, multicenter, randomized, double-blind, placebo-controlled clinical trial of ivosidenib in previously-treated patients with nonresectable or metastatic cholangiocarcinoma with an IDH1 mutation. The trial has an overall endpoint of PFS. The trial was initiated in December 2016 and is currently enrolling patients, and we expect to complete enrollment in 2019.
AG-881: brain penetrant pan-IDH program
AG-881 is an orally available, selective, brain-penetrant, pan-IDH mutant inhibitor, which provides added flexibility to our current portfolio of IDH mutant inhibitors. We are currently focusing our development efforts for AG-881 in glioma. We and Celgene are developing AG-881 pursuant to the AG-881 Agreements, described below.
We are conducting two phase 1 multi-center, open-label clinical trials of AG-881, one in patients with advanced IDH1 or IDH2 mutant-positive solid tumors, including glioma, and the other in patients with advanced IDH1 or IDH2 mutant-positive hematologic malignancies whose cancer has progressed on a prior IDH inhibitor therapy. The goal of these trials is to evaluate the safety, pharmacokinetics, pharmacodynamics and clinical activity of AG-881 in advanced solid tumors and hematologic malignancies, respectively. In each trial, AG-881 is administered continuously as a single agent dosed orally in a 28-day cycle. The first portion of each trial includes a dose-escalation phase in which cohorts of patients receive ascending oral doses of AG-881 to determine the maximum tolerated dose, or MTD, and/or the recommended phase 2 dose based on safety and tolerability. The second portion of each trial is a dose expansion phase where patients receive AG-881 to further evaluate the safety, tolerability and clinical activity of the recommended phase 2 dose.Agios-2023Pipeline-v3a-1.jpg
The phase 1 trial in patients with advanced IDH1 or IDH2 mutant-positive hematologic malignancies has completed its dose escalation portion, establishing proof of mechanism as measured by reductions in 2HG levels, and is now closed for enrollment. No MTD was reached. In the phase 1 trial in IDH1 or IDH2 mutant-positive advanced solid tumors, an MTD was established and enrollment is complete.
We have not yet presented any clinical data from these trials. In October 2017, we presented the first preclinical data of AG-881 in IDH mutant-positive solid and hematologic malignancies at the AACR-NCI-EORTC International Conference on Molecular Targets and Cancer Therapeutics in Philadelphia, Pennsylvania.
In the first half of 2018, we intend to initiate a perioperative study with ivosidenib and AG-881 in low grade glioma to further investigate their effects on brain tumor tissue. Pursuant to the AG-881 Agreements, described below, Celgene has elected not to participate in this clinical trial and, as a result, we will fund the trial ourselves. Celgene will continue to co-fund the ongoing phase 1 trials of AG-881 described above.
PKRPK Activator ProgramPrograms
PK is thean enzyme involved in glycolysis — the second to last reaction in glycolysis-the conversion of glucose into lactic acid. This enzyme is critical for the survival of the cell and has several tissue-specific isoforms (PKR, PKL, PKM1 and PKM2). Pyruvate kinase-R, or PKR, is the isoform of pyruvate kinasePK that is present in red blood cells, or RBCs. Mutations in PKR cause defects in red cellRBC glycolysis and lead to a hematological RGDrare disease known as pyruvate kinase deficiency, or PK deficiency. Glycolysis is the only pathway available for RBCs to maintain the production of Adenosine-5’-triphosphate,adenosine triphosphate, or ATP, which is a form of chemical energy within cells. Accordingly, total absencewe believe that activation of themutant forms of PKR gene is not compatiblecan restore glycolytic pathway activity and increase RBC health in patients with life. PK deficiency, leads to a shortened life span forand activation of wild-type (non-mutated) PKR can increase ATP which can then meet the increased energy demands resulting from metabolic stress in RBCs of patients with hemolytic anemias such as thalassemia and is the most common form of non-spherocytic hemolytic anemia in humans.SCD.
PK Deficiency
PK deficiency is a rare genetic disorder and disease understanding is still evolving. We estimate that the prevalence of PK deficiency is between approximately 1-in-75,0003,000 and 1-in-200,000 people,8,000 individuals in the United States and weEU5, and believe that the disease is likely under-diagnosed. PK deficiency leads to a shortened life span for RBCs and is the most common form of non-spherocytic hemolytic anemia in humans.
There is currently no known unique ethnic or geographic representation of the disease. The disease manifests by mild to severe forms of anemia caused by the excessive premature destruction of RBCs. The chronic hemolysis can lead to long-term complications and comorbidities, regardless of the degree of the anemia, often resulting in jaundice and lifelong conditions
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associated with chronic anemia and secondary complications. The precise mechanism for the destructionhemolysis is not well understood but is thought to result from membrane instability secondary to the metabolic defect caused by the low level of PKR enzyme. The hemolysis is “extra-vascular” in that the RBCs are destroyed in small capillaries or organs and do not spontaneously break open in the circulation. PK deficiency is an autosomal recessive disease whereby all patients inherit two mutations, one from each parent. Children with the disease produce PKR enzyme that has only a fraction of the normal level of activity (generally <50%). Parents of affected children have only one copy of the mutated PKR enzymeCurrent management strategies for PK deficiency, including blood transfusion and splenectomy, are clinically normal.associated with both short- and long-term risks. More than 250350 different mutations have been identified to date. As a result, there are many different possible mutant combinations and no one clear mutational profile. The mutations observed in PK deficiency patients are classified in two main categories. A missense mutation causes a single amino acid change in the protein, generally resulting in some functional protein in the RBCs. A non-missense mutation is any mutation other than a missense mutation, generally resulting in little functional protein in the RBCs. It is estimated that 58 percent of patients with PK deficiency have two missense mutations, 27 percent have one missense and one non-missense mutation, and 15 percent have two non-missense mutations. Boston Children’s Hospital, in collaboration with us, is conducting a Natural History Study to better understand the symptoms and complications

of PK deficiency, identify patients and treatment centers, and capture other clinical data, including genetic information. We intend to initiatemaintain a global registry, called Peak, for up to 500 adult and pediatric patients with PK deficiency in the first quarter of 2018 to increase understanding of the long-term disease burden of this chronic hemolytic anemia.
AG-348:Thalassemia
Thalassemia is a hereditary blood disorder in which mutations in the α- or β-globin chains of hemoglobin lead to globin chain precipitates and aggregates that disturb the RBC membrane and induce oxidative stress, leading to decreased survival of RBC precursors, ineffective erythropoiesis, hemolysis of mature RBCs, and anemia. We estimate that the prevalence of thalassemia is between 18,000 and 23,000 individuals in the United States and EU5; approximately 70,000 individuals in Saudi Arabia, United Arab Emirates, Kuwait, Bahrain, Qatar and Oman, also known as the Gulf Council Countries, or GCC; and greater than one million individuals worldwide. In addition to anemia, patients with thalassemia can experience enlarged spleen, bone deformities, iron overload, fatigue, and infection. Current treatment strategies for thalassemia include blood transfusion and bone marrow transplantation, as well as newer therapies such as Reblozyl® (luspatercept-aamt) for the treatment of beta-thalassemia or Casgevy® for the treatment of transfusion-dependent beta-thalassemia. We believe that the activation of wild-type PKR may increase ATP production and improve red cell fitness and survival of thalassemic RBCs, by increasing the clearance globin chain aggregates through ATP-dependent proteolytic mechanisms.
Sickle Cell Disease (SCD)
SCD is an inherited blood disorder caused by mutations in hemoglobin that enable the hemoglobin to form long polymeric chains under certain conditions such as low oxygenation, or deoxygenation. Polymerization of this irregular hemoglobin results in RBCs taking on a sickle shape, causing them to aggregate and obstruct small blood vessels, restricting blood flow to organs resulting in pain, cell death and organ damage. We estimate that the prevalence of SCD is between 120,000 and 135,000 individuals in the United States and EU5 and greater than three million individuals worldwide. RBC deoxygenation is modulated by several factors, including the levels of 2,3-diphosphoglycerate, or 2,3-DPG, which is found to be elevated in sickle cell patient RBCs. Current treatment strategies focus on managing and preventing acute RBC sickling, and include hydroxyurea, L-glutamine and blood transfusions, as well as recently approved therapies such as Adakveo® and Oxbryta®. We believe that activation of wild-type PKR in patients with SCD may reduce hemoglobin polymerization and the sickling process by at least two mechanisms. Reducing the level of 2,3-DPG in RBCs would increase the oxygenation state of hemoglobin to reduce sickling, while increasing the levels of ATP may improve RBC hydration status which may also inhibit the sickling process.
Lower Risk MDS (LR MDS)
MDS is a heterogeneous group of rare hematological malignancies characterized by dysfunctional hematopoiesis (or formation of blood cells), progressive cytopenia (or lower-than-normal number of blood cells) and an increased risk of progression to acute myeloid leukemia, or AML. The most common type of MDS is LR MDS, but many existing therapies and therapies under development focus on high risk MDS. Among patients with LR MDS, which is less likely to progress to AML, the primary concern is symptomatic anemia. We estimate that the prevalence of LR MDS in the United States and EU5 is between 75,000 and 80,000 individuals. We believe that activation of wild-type PK Deficiency Programin LR MDS patients may improve deficient PK activity in MDS erythrocytes. Current treatment options for LR MDS often require in-office visits and transfusions, and erythropoiesis stimulating agents and Reblozyl® are the only approved therapies to treat anemia in a subset of patients. Despite approved therapies in subsets of patients, LR MDS associated anemia remains a disease with a high unmet medical need.
AG-348Phenylketonuria (PKU)
PKU, is a rare, genetic disease caused by deficiency of the PAH enzyme. Lack of PAH activity leads to the accumulation of phenylalanine and downstream neurocognitive deficits. Patients with PKU are therefore often advised to consume a highly restricted diet to in order to minimize phenylalanine intake, which can further reduce patient quality of life. We estimate that the
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prevalence of PKU in the United States and EU5 is between 35,000 and 40,000 individuals. To directly address the underlying cause of PKU, we are developing AG-181, a PAH stabilizer with a goal of reducing phenylalanine levels.
Polycythemia Vera (PV)
PV is a rare blood disorder with no disease-modifying treatments that affects approximately 100,000 individuals in the United States. PV is characterized by excessive production of RBCs, which leads to increased blood volume and viscosity, and can result in thrombosis, cardiovascular events, and death. Phlebotomy, which is the procedure of withdrawing blood, is the current standard of care for patients with PV.
PYRUKYND® (mitapivat): First-in-Class PK Activator
We are developing PYRUKYND® for the treatment of PK deficiency and other hemolytic anemias such as thalassemia and SCD. PYRUKYND® is an orally available small molecule and a potent activator of the wild-type (normal) and mutated PKR enzyme. We have shown that AG-348 can restore ATP levels and decrease 2,3-diphosphoglycerate, or 2,3-DPG, levelsPK enzymes.
In February 2022, the FDA approved PYRUKYND® for the treatment of hemolytic anemia in blood sampled from patientsadults with PK deficiency when treated ex-vivo with AG-348. The wild-type PKR activityin the United States. In November 2022, we received marketing authorization from the European Commission for PYRUKYND® for the treatment of AG-348 allowedPK deficiency in adult patients in the studyEU. In December 2022, we received marketing authorization in Great Britain for PYRUKYND® for the treatment of enzyme activationPK deficiency in healthy volunteers, providing an opportunity to understandadult patients under the safety, dosingEuropean Commission Decision Reliance Procedure. In addition, we are currently evaluating PYRUKYND® in clinical trials for the treatment of thalassemia, SCD, and pharmacodynamic activity of AG-348 prior to entering a proof-of-concept study in patients, and provides for potential expansion opportunities into other anemias. The FDA granted us orphan drug designation for AG-348 for treatment ofpediatric patients with PK deficiency. We intend to initiate two global, pivotal trials of AG-348 in PK deficiency in the first half of 2018: ACTIVATE-T, a single arm trial of approximately 20 regularly transfused patients, is expected to initiate in the first quarter of 2018, and ACTIVATE, a 1:1 randomized, placebo-controlled trial of approximately 80 patients who do not receive regular transfusions, is expected to initiate in the second quarter of 2018. We also expect to initiate a phase 2 proof of concept trial of AG-348 in thalassemia in the fourth quarter of 2018.
DRIVE-PK
In June 2015, we initiated DRIVE PK, a global phase 2, first-in-patient, open-label safety and efficacy clinical trial of AG-348 in adult, transfusion-independent patients with PK deficiency. The multi-center, randomized trial includes two arms with up to 25 patients each. The patients in the first arm receive 50 mg twice daily, and the patients in the second arm receive 300 mg twice daily. The trial includes a 24-week treatment period with the opportunity for continued treatment beyond 24 weeks based on safety and clinical activity.
In June 2016, we reported the first clinical data from DRIVE PK at EHA, establishing proof of concept for AG-348. The trial reached target enrollment of 52 patients in November 2016, and in December 2017, we reported updated data from the trial at ASH 2017. As of the July 14, 2017 data cut-off, 43 patients completed the six-month core dosing period and nine patients discontinued treatment during the core dosing period. Thirty-six of 43 patients who completed the six-month core treatment period entered the extension period. As of the data cut-off, 29 patients remained on treatment in the extension period. A safety analysis was conducted based on all 52 treated patients as of the data cut-off. AG-348 remained well-tolerated, and the majority of treatment-related AEs were Grade 1-2; the most frequent being headache, insomnia and nausea. Four patients experienced treatment-related AEs leading to discontinuation: pleural effusion (n=1), hypertriglyceridemia (n=1), pharyngitis/nausea (n=1) and anemia (n=1). Four patients experienced treatment-related SAEs: withdrawal hemolysis followed by anemia (n=1), anemia (n=1), osteoporosis (n=1) and hypertriglyceridemia (n=1). Measurements of hormone levels in men at doses less than or equal to 50 mg twice daily suggest mild aromatase inhibition by AG-348, and ongoing follow-up will continue to assess the potential clinical significance of this aromatase inhibition. Twenty-six of 52 patients (50%) overall and 25 of 42 patients (60%) with at least one missense mutation achieved rapid and sustained Hb increases from baseline of greater than 1.0 g/dL as of the data cut-off. In patients who had Hb increases of greater than 1.0 g/dL, the mean maximum Hb increase was 3.4 g/dL (range 1.1 to 5.8 g/dL). The median time to first Hb increase of greater than 1.0 g/dL was 10 days (range 7 to 187 days). The median baseline Hb in patients who experienced a maximum Hb increase of greater than 1.0 g/dL was 9.7 g/dL (range 7.3 to 12.3 g/dL) compared to 8.0 g/dL (range 6.5 to 10.1 g/dL) in patients who did not experience the increase.
ACTIVATE/ACTIVATE-T
We intend to initiate two global, pivotal trials of AG-348 in PK deficiency in the first half of 2018: ACTIVATE-T, a single arm trial of approximately 20 regularly transfused patients, is expected to initiate in the first quarter of 2018, and ACTIVATE, a 1:1 randomized, placebo-controlled trial of 80 patients who do not receive regular transfusions, is expected to initiate in the second quarter of 2018. The primary endpoint of the ACTIVATE trial is the proportion of patients who achieve at least a 1.5 g/dL increase in Hb sustained over multiple visits, and the primary endpoint of the ACTIVATE-T trial is a reduction in transfusion burden over a six-month period compared to the patient’s transfusion history.
In addition to the above planned and ongoing clinical trials of AG-348, we plan to initiate a phase 2 proof of concept trial of AG-348 in thalassemia in the fourth quarter of 2018.
We have worldwide development and commercial rights to AG-348PYRUKYND® and expect to fund the future development and commercialization costs related to this program.
AG-270: Targeting MAT2A PYRUKYND® has been granted orphan drug designation for the treatment of MTAP-deleted cancers
AG-270, a MAT2A inhibitor, is our development candidate focused on MTAP-deleted cancers. We submitted an IND for AG-270 in November 2017 and, in December 2017,PK deficiency by the FDA concluded that we may proceed with a proposed phase 1 dose-escalation trial in multiple tumor types carrying an MTAP deletion, which we expect to initiate inand the first quarter of 2018.

MTAP is a metabolic gene that is deleted in approximately 15 percent of all cancers. We have shown in preclinical studies that MTAP deletion predicts sensitivity to inhibition of a subset of enzymes involved inEMA. Additionally, PYRUKYND® has received orphan drug designation from the synthesis or utilization of the methyl donor S-adenosylmethionine, or SAM. Among this subset of enzymes, we have targeted MAT2A, the enzyme responsible for
the synthesis of SAM in tumor cells. We have discovered small molecule inhibitors of MAT2A, including AG-270, that reduce SAM production and cause antiproliferative effects in MTAP-null cancer cell lines in vitro and in MTAP-deleted tumor models in vivo. MTAP deletion is readily detected by a genomic or immunohistochemistry test, thus allowing the selection of patients predicted to be sensitive to the therapy.
In March 2017, we announced that Celgene designated AG-270 as a development candidate under our 2016 research agreement with Celgene, or the 2016 Agreement. Pursuant to the 2016 Agreement, Celgene paid us an $8.0 million designation fee upon its designation of AG-270 as a development candidate. Exploratory research, drug discovery and early development of AG-270 is led by us, and Celgene will have an opt-in right on AG-270 up through phase 1 dose escalation for at least a $30.0 million fee. Upon opt-in, we and Celgene will have global co-development and co-commercialization rights with a worldwide 50/50 cost and profit share on AG-270, and we will be eligible for up to $168.8 million in clinical and regulatory milestone payments.
Targeting DHODHFDA for the treatment of hematologic malignanciesthalassemia and SCD.
In January 2018, we announced that we plan to submit an IND in the fourth quarter of 2018 for our latest development candidate, an inhibitor of DHODH, licensed by us from Aurigene Discovery Technologies Limited, for the treatment of hematologic malignancies. We have discovered a lineage-specific dependence on DHODHbuilt our commercial infrastructure to support the commercial launch of PYRUKYND® in hematologic malignancies, particularly AML and diffuse large B-cell lymphoma. DHODH catalyzes a critical stepadult PK deficiency in the biosynthesis of pyridimidines, which are critical for the production of RNA and DNA. We believe that DHODH inhibition will be differentiated from standard-of-care therapies, both by exhibiting activity in cancers that are resistant to standard-of-care chemotherapeutics and through a mechanism of anti-tumor effect that combines cell growth arrest and cellular differentiation.
Collaborations with Celgene
2016 Agreement
In May 2016, we entered into the 2016 Agreement with Celgene, which is focused on MIO. In addition to new programs identified under the 2016 Agreement, both parties also agreed that all future development and commercialization of two remaining cancer metabolism programs discovered under the 2010 Agreement, including AG-270, our MAT2A inhibitor, will be governed by the 2016 Agreement.
During the research term of the 2016 Agreement, we plan to conduct research programs focused on discovering compounds that are active against metabolic targets in the immuno-oncology, or IO, field. The initial four-year research term will expire on May 17, 2020, and may be extended for up to two, or in specified cases, up to four additional one-year terms.
For each program under the 2016 Agreement, we may nominate compounds that meet specified criteria as development candidates and, in limited circumstances, Celgene may also nominate compounds as development candidates for each such program. Celgene may designate the applicable program for further development following any such nomination, after which we may conduct, at our expense, additional preclinical and clinical development for such program through the completion of an initial phase 1 dose escalation study.
At the end of the research term, Celgene may designate for continued development up to three research programs for which development candidates have yet to be nominated, which are referred to as continuation programs. We may conduct further research and preclinical and clinical development activities on any continuation program, at our expense, through the completion of an initial phase 1 dose escalation study.
We granted Celgene the right to obtain exclusive options for development and commercialization rights for each program that Celgene has designated for further development and for each continuation program. Celgene may exercise each such option beginning on the designation of a development candidate for such program (or on the designation of such program as a continuation program) and ending on the earlier of: (i) the end of a specified period after we have furnished Celgene with specified information about the initial phase 1 dose escalation study for such program, or (ii) January 1, 2030. Research programs that have applications in the inflammation or autoimmune, or I&I, field that may result from the 2016 Agreement will also be subject to the exclusive options described above.
We will retain rights to any program that Celgene does not designate for further development or as to which it does not exercise its option.
Under the terms of the 2016 Agreement, following Celgene’s exercise of its option with respect to a program, the parties will enter into either a co-development and co-commercialization agreement if such program is in the IO field, or a license agreement if such program is in the I&I field. Under each co-development and co-commercialization agreement, the two parties

will co-develop and co-commercialize licensed products worldwide. Either we or Celgene will lead development and commercialization of licensed products for the United States, and Celgene will lead development and commercialization of licensed products outside of the United States. Depending on the country, the parties will each have the right to provide a portion of field-based marketing activities. Under each license agreement, Celgene will have the sole right to develop and commercialize licensed products worldwide.
Co-development and co-commercialization agreements Under each co-development and co-commercialization agreement entered into under the 2016 Agreement, the parties will split all post-option exercise worldwide development costs, subject to specified exceptions, as well as any profits from any net sales of, or commercialization losses related to, licensed productsIn connection with our regulatory approvals in the IO field. Celgene hasEU and Great Britain, we are currently providing access to PYRUKYND® free of charge for eligible patients in those jurisdictions through a global managed access program. We may provide access to PYRUKYND® for adult patients with PK deficiency in other jurisdictions upon request through the optionglobal managed access program, on either a free of charge or for charge basis. Beyond the global managed access program, we continue to designate one program in the IO field as the 65/35 program, for which Celgene will be the lead partyevaluate options for the United States and will have a 65% profit or loss share. For programs in the IO field other than the 65/35 program, we and Celgene will alternate, on a program-by-program basis, being the lead party for the United States, with us having the right to be the lead party for the first such program, and each party will have a 50% profit or loss share. The lead party for the United States will book commercial sales of licensed products, if any, in the United States, and Celgene will book commercial sales of licensed products, if any, outside of the United States.
License agreements Under each license agreement under the 2016 Agreement, Celgene will be responsible for all post-option exercise worldwide development and associated costs, subject to specified exceptions, as well as worldwide commercialization and associated costs, for licensed products in the I&I field.
Financial terms Under the terms of the 2016 Agreement, we received an initial upfront payment in the amount of $200.0 million. The 2016 Agreement provides specified rights to extend the research term for up to two, or in specified cases, up to four, additional years by paying a $40.0 million per-year extension fee. Celgene will pay an $8.0 million designation fee for each program that Celgene designates for further development and for each continuation program. During the year ended December 31, 2017, we received $8.0 million from Celgene upon the designation of AG-270, our MAT2A inhibitor, as a development candidate. For each program as to which Celgene exercises its option to develop and commercialize, subject to antitrust clearance, Celgene will pay an option exercise fee of at least $30.0 million for any designated development program and at least $35.0 million for any continuation programs. In certain cases, Celgene may exercise its option to develop and commercialize two early-stage I&I programs, prior to Celgene designating the program for further development, by paying an option exercise fee of $10.0 million.
We are eligible to receive the following milestone-based payments associated with the 2016 Agreement:
ProgramMilestoneAmount
65/35 program in IO fieldSpecified clinical development event$25.0 million
65/35 program in IO fieldSpecified regulatory milestone eventsUp to $183.8 million
50/50 program in IO fieldSpecified clinical development event$20.0 million
50/50 program in IO fieldSpecified regulatory milestone eventsUp to $148.8 million
I&I fieldSpecified clinical development event$25.0 million
I&I fieldSpecified regulatory milestone eventsUp to $236.3 million
I&I fieldSpecified commercial milestone eventsUp to $125.0 million
Additionally, for each licensed program in the I&I field, we are eligible to receive royalties at tiered, low double-digit percentage rates on Celgene’s net sales, if any, of the applicable licensed products.
Opt-out right Under the 2016 Agreement, we may elect to opt out of the cost and profit share under any co-development and co-commercialization agreement, subject to specified exceptions. Upon opting out, Celgene will have the sole right to develop, manufacture and commercialize the applicable licensed products throughout the world, at its cost, and we will undertake transitional activities reasonably necessary to transfer the development, manufacture and commercialization of such licensed products to Celgene, at our expense. Further, in lieu of the profit or loss sharing described above, we would be eligible to receive royalties at tiered, low double-digit percentage rates on Celgene’s net sales, if any, of the applicable licensed products. However, we would continue to be eligible to receive the developmental and regulatory milestone-based payments described above.
Term The term of the 2016 Agreement commenced on May 17, 2016 and, if not terminated earlier, will expire upon the later of the last-to-expire of the research term and all option exercise periods, or, if an option is exercised by Celgene for one or more programs in the collaboration, upon the termination or expiration of the last-to-exist co-development and co-commercialization agreement or license agreement, as applicable, for any such program.

Termination Subject to specified exceptions, Celgene may terminate the 2016 Agreement in its entirety for any reason by providing us with prior written notice if there are no active co-development and co-commercialization agreements or license agreements in place or on a program-by-program basis if there are no active co-development and co-commercialization agreements or license agreements in place for the terminated program(s). Either party may terminate the 2016 Agreement for the insolvency of the other party. On a program-by-program basis, prior to the exercise of an option, either party may terminate the 2016 Agreement either in its entirety or with respect to one or more programs on prior written notice to the other party in the case of an uncured material breach by the other party that frustrates the fundamental purpose of the 2016 Agreement. Following the exercise of an option for a program, either party may terminate the 2016 Agreement with respect to such program if such party terminates the co-development and co-commercialization agreement or license agreement for such program for an uncured material breach by the other party that frustrates the fundamental purpose of such agreement. Either party may terminate a co-development and co-commercialization agreement or a license agreement upon the bankruptcy or insolvency of the other party. Either party also has the right to terminate the co-development and co-commercialization agreement or license agreement if the other party or any of its affiliates challenges the validity, scope or enforceability of or otherwise opposes, any patent included within the intellectual property rights licensed to the other party under such agreement.
Exclusivity While any of Celgene’s options remain available under the 2016 Agreement, subject to specified exceptions, we may not directly or indirectly develop, manufacture or commercialize, outside of the 2016 Agreement, any therapeutic modality in the IO or I&I field with specified activity against a metabolic target.
During the term of each co-development and co-commercialization agreement and license agreement, subject to specified exceptions, neither we nor Celgene may directly or indirectly develop, manufacture or commercialize outside of such agreement any therapeutic modality in any field with specified activity against the metabolic target that is the focus of the program licensed under such agreement.
Ivosidenib Letter Agreement
On May 17, 2016, we entered into a letter agreement with Celgene regarding ivosidenib, or the Ivosidenib Letter Agreement. Under the Ivosidenib Letter Agreement, the parties agreed to terminate the 2010 Agreement, effective as of August 15, 2016, as to the program directed to the IDH1 target, for which ivosidenib is the lead development candidate. Under the 2010 Agreement, Celgene had held development and commercialization rights to the IDH1 programPYRUKYND® outside of the United States, including through exploring potential partnership opportunities.
We are evaluating PYRUKYND® in the following clinical trials:
An extension study evaluating the long-term safety, tolerability and efficacy of treatment with PYRUKYND® in patients from ENERGIZE, our completed phase 3, double-blind, randomized, placebo-controlled multicenter study pivotal trial of PYRUKYND® in adults with non-transfusion-dependent alpha- or beta-thalassemia. We announced topline data for ENERGIZE in January 2024. A total of 194 patients were enrolled in the study, with 130 randomized to PYRUKYND® 100 mg twice-daily, and 64 randomized to matched placebo. 122 patients (93.8%) in the PYRUKYND® arm and 62 patients (96.9%) in the placebo arm completed the 24-week double-blind period of the study. The study met the primary endpoint of hemoglobin response, where treatment with PYRUKYND® demonstrated a statistically significant increase in hemoglobin response compared to placebo, as 42.3% of patients in the PYRUKYND® arm achieved a hemoglobin response, compared to 1.6% of patients in the placebo arm (2-sided p<0.0001). Treatment with PYRUKYND® also demonstrated statistically significant improvements compared to placebo for both key secondary endpoints: (i) change from baseline in average Functional Assessment of Chronic Illness Therapy-Fatigue, or FACIT-Fatigue, subscale score from week 12 to week 24 and (ii) change from baseline in average emoglobin concentration from week 12 to week 24. During the 24-week double-blind period, four (3.1%) subjects in the PYRUKYND® arm experienced adverse events, or AEs, leading to discontinuation, and there were no AEs in the placebo arm leading to discontinuation. We plan to provide a more detailed analysis of the data from this trial at an upcoming medical meeting and we held such rights insideaim to submit an NDA for PYRUKYND® in thalassemia to the United States. AsFDA by the end of 2024.
ENERGIZE-T, a resultphase 3, double-blind, randomized, placebo-controlled multicenter study evaluating the efficacy and safety of PYRUKYND® as a potential treatment for adults with transfusion-dependent alpha- or beta-thalassemia, defined as 6 to 20 RBC units transfused and ≤ six-week transfusion-free period during the 24-week period before randomization. The primary endpoint of the Ivosidenib Letter Agreement,trial is percentage of patients with transfusion reduction response, defined as a ≥50% reduction in transfused RBC units with a reduction of ≥2 units of transfused RBCs in any consecutive 12-week period through week 48 compared with baseline. Secondary endpoints include additional transfusion reduction measures and percentage of participants with transfusion-independence. This trial has completed enrollment and we obtained global rightsplan to ivosidenibannounce topline data from this trial in mid-2024.
RISE UP, a phase 2/3 study evaluating the efficacy and safety of PYRUKYND® in SCD patients who are 16 years of age or older, have had between two and 10 sickle cell pain crises in the past 12 months, and have hemoglobin within the range of 5.5 to 10.5 g/dL during screening. We enrolled 79 patients in the phase 2 portion of the trial, with 26 patients in
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the 50 mg twice daily mitapivat arm, 26 patients in the 100 mg twice daily mitapivat arm and 27 patients in the placebo arm. The primary endpoints of the phase 2 portion of the trial were hemoglobin response, defined as defined as ≥ 1 g/dL increase in average hemoglobin concentration from week 10 to week 12 compared to baseline, and safety. In June 2023, we announced the phase 2 portion of this trial had achieved its primary endpoint of hemoglobin response in patients in both 50 mg and 100 mg twice daily mitapivat arms. 46.2% of patients (n=12) in the 50 mg twice daily mitapivat arm and 50.0% of patients (n=13) in the 100 mg twice daily mitapivat arm achieved a hemoglobin response, compared to 3.7% of patients (n=1) in the placebo arm (2-sided p=0.0003 and 0.0001, respectively). In December 2023, we announced the following additional results of the phase 2 portion of the trial: (i) the least-squares mean (95% confidence interval) for average change from baseline in hemoglobin levels, from week 10 through week 12, for patients in the 50 mg twice daily mitapivat, 100 mg twice daily mitapivat, and placebo arms, respectively, was 1.11 (0.77, 1.45) g/dL, 1.13 (0.79, 1.47) g/dL, and 0.05 (−0.28, 0.39) g/dL; (ii) we observed improvements in annualized rates of sickle cell pain crises as the annualized rate of sickle cell pain crises (95% confidence interval) for patients in the 50 mg twice daily and 100 mg twice daily mitapivat arms, respectively, was 0.83 (0.34, 1.99) and 0.51 (0.16, 1.59), compared to 1.71 (0.95, 3.08) for patients in the placebo arm; (iii) we observed improvement in patient-reported fatigue scores in the 50 mg twice daily mitapivat arm compared to the placebo arm, and the IDH1 program. Neither partyleast-squares mean (95% confidence interval) for average changes from baseline in patient-reported fatigue score, from week 10 through week 12, for patients in the 50 mg twice daily mitapivat, 100 mg twice daily mitapivat, and placebo arms, respectively, was −3.80 (−7.16, −0.45), −0.10 (−3.27, 3.08), and −0.17 (−3.40, 3.07). The safety profile for mitapivat observed in the phase 2 portion of the trial was generally consistent with previously reported data in other studies of SCD and other hemolytic anemias. The most common treatment-emergent AEs in the 50 mg BID, 100 mg BID, and placebo arms, respectively, were: headache (n=6, 6, 7), arthralgia (n=3, 5, 9), dysmenorrhea (n=0, 3, 0), pain (n=3, 3, 2), pain in extremity (n=1, 3, 6), back pain (n=4, 2, 3), nausea (n=1, 2, 4), fatigue (n=4, 1, 5), and influenza-like illness (n=1, 1, 3). There were no serious treatment-emergent adverse events, or TEAEs, attributed to mitapivat and there were no adverse events leading to drug reduction, discontinuation, interruption or death in either the mitapivat or the placebo arms. Of the 79 patients enrolled in the study, 73 continued into the Phase 2 open-label extension period. In October 2023, we enrolled the first patient in the phase 3 portion of this trial. The phase 3 portion includes a 52-week randomized, placebo-controlled period in which participants will be randomized in a 2:1 ratio to receive the recommended (100 mg twice daily) PYRUKYND® dose level or the placebo. The primary endpoints are hemoglobin response, defined as ≥1 g/dL increase in average hemoglobin from baseline to week 52, and annualized rate of sickle cell pain crises. Participants who complete either the phase 2 or phase 3 portion will have any further financial obligation,the option to move into a 216-week open-label extension period to continue to receive PYRUKYND®. We anticipate completing enrollment by the end of 2024 and announcing topline data for this trial in 2025.
ACTIVATE-kids and ACTIVATE-kidsT, double-blind phase 3 studies evaluating the efficacy and safety of PYRUKYND® as a potential treatment for PK deficiency in not regularly transfused and regularly transfused patients between one and 18 years old, respectively. The primary endpoint of ACTIVATE-kids is percentage of patients with hemoglobin response, defined as ≥1.5 g/dL increase in hemoglobin concentration from baseline that is sustained at two or more scheduled assessments at weeks 12, 16, and 20 during the double-blind period. The primary endpoint of ACTIVATE-kidsT is transfusion reduction response, defined as ≥33% reduction in total RBC transfusion volume from week 9 through week 32 of the double-blind period. ACTIVATE-kidsT has completed enrollment and we expect to announce topline data for this trial by the end of 2024. ACTIVATE-kids is currently enrolling patients, we expect to complete enrollment for this trial by mid-2024, and we anticipate announcing topline data for this trial in 2025.
An extension study evaluating the long-term safety, tolerability and efficacy of treatment with PYRUKYND® in patients from ACTIVATE and ACTIVATE-T, our completed pivotal trials of PYRUKYND® in not regularly transfused and regularly transfused adult patients with PK deficiency.
An extension study evaluating the long-term safety, tolerability and efficacy of treatment with PYRUKYND® in patients from DRIVE PK, our completed global phase 2, first-in-patient, open-label safety and efficacy clinical trial of PYRUKYND® in adult, not regularly transfused patients with PK deficiency.
An extension study evaluating the safety, tolerability and efficacy of treatment with PYRUKYND® in patients from our completed phase 2, open-label safety and efficacy clinical trial of PYRUKYND® in adults with non-transfusion-dependent alpha- and beta-thalassemia.
In collaboration with the Company, the National Institutes of Health, or NIH, is evaluating PYRUKYND® in a phase 1 trial in patients with SCD pursuant to a cooperative research and development agreement. The core trial period has completed, and the long-term extension study is ongoing. In June 2020, clinical proof of concept was established based on a preliminary analysis of the data from this trial.
In collaboration with the Company, University Medical Center Utrecht, or UMC Utrecht, is evaluating PYRUKYND® in patients with SCD pursuant to an investigator sponsored trial agreement. The trial has completed enrollment and
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patient follow-up is ongoing, and a 2-year extension study has been initiated for patients who complete the follow-up period.
AG-946: Novel PK Activator
We are developing AG-946, a novel PK activator, for the potential treatment of LR MDS and hemolytic anemias. We are evaluating AG-946 in a phase 1 trial of AG-946 in healthy volunteers and in patients with SCD. We have presented data from the healthy volunteer cohorts, and we have initiated the SCD patient cohort of this phase 1 trial.
We initiated a phase 2a clinical trial of AG-946 in adults with LR MDS in the third quarter of 2022, and the trial has completed enrollment with 22 patients, including royalties or milestone payments,12 patients classified as non-transfused and 10 patients classified as low transfusion burden. Patients received 5 mg of AG-946 once daily for up to 16 weeks. The two primary endpoints of the trial were transfusion independence (for patients classified as low transfusion burden), defined as transfusion-free for ≥ eight consecutive weeks during the 16-week treatment period, and hemoglobin response, defined as a ≥ 1.5 g/dL increase from baseline in the average hemoglobin concentration measured from week 8 through week 16.
In November 2023, we announced that we achieved clinical proof-of-concept in the phase 2a portion of the trial. We observed that four of the 10 patients with low transfusion burden achieved the transfusion independence endpoint, and one of the 22 patients achieved the hemoglobin response endpoint in the 16-week treatment period. The safety profile observed was consistent with data reported in the healthy volunteer study of AG-946. 19 patients elected to enroll in the extension period for up to 156 weeks. We intend to complete a full evaluation of the phase 2a trial results and assess the impact on the phase 2b portion of the protocol in 2024. We anticipate initiating a phase 2b trial of AG-946 in adults with LR MDS in mid-2024.
Other Programs
In addition to the other concerning ivosidenibaforementioned development programs, we are developing AG-181, a PAH stabilizer for the potential treatment of PKU, for which we filed an investigational new drug, or IND, application in December 2023, and plan to initiate a phase 1 study in healthy volunteers in the IDH1 program. Under the termsfirst half of the Ivosidenib Letter Agreement, the parties also agreed to conduct specified transitional activities2024. Also, in connection with the termination. In addition, pursuant to the Ivosidenib Letter Agreement, the parties are released from their exclusivity obligations under the 2010 Agreement with respect to the IDH1 program. The Ivosidenib Letter Agreement does not affect the AG-881 Agreements, which are directed to both the IDH1 target and the IDH2 target.
AG-881 Agreements
On April 27, 2015,July 2023, we entered into a joint worldwide development and profit share collaboration and license agreement with Celgene, and our wholly owned subsidiary, Agios International Sarl, entered into a collaboration and license agreement with Celgene's wholly owned subsidiary, Celgene International II Sarl, or collectively, the AG-881 Agreements. The AG-881 Agreements establish a joint worldwide collaboration focused onAlnylam for the development and commercialization of AG-881 products. Under the terms of the AG-881 Agreements, we received an initial upfront payment of $10.0 million in May 2015 and are eligible to receive milestone-based payments. The parties will split all worldwide development costs equally, subject to specified exceptions, as well as any profits from any net sales of,products containing or commercialization losses related to, licensed AG-881 products. Either party may, at its own expense and with the other party's permission, undertake additional development activities outside of the scope of the development plan agreed upon with the other party.
Financial terms We are eligible to receive up to $70.0 million in potential milestone payments under the AG-881 Agreements. The potential milestone payments are comprised of: (i) a $15.0 million milestone payment for filing of the first NDA in a major market, and (ii) up to $55.0 million in milestone payments upon achievement of specified regulatory milestone events. We may also receive royalties at tiered, low-double digit to mid-teen percentage rates on net sales if we elect not to participate in the development and commercialization of AG-881.
Collaboration governance. The collaboration is managed by a set of joint committees comprised of equal numbers of representatives from each of Celgenean siRNA preclinical development candidate discovered by Alnylam and us. The joint steering committee oversees and coordinatestargeting the overall conduct of the collaboration. The joint development committee oversees and coordinates development (including manufacturing of clinical supply) of medicines containing AG-881. The joint commercialization committee will oversee the commercialization (including manufacturing of commercial supply) of medicines containing AG-881. The joint patent committee oversees the parties’ patent rights under the collaboration. If there is not unanimity with respect to matters pertaining to the development of

AG-881, then neither party shall have decision-making authority with respect to such matter and neither party may take action with respect to such matter unless and until it is resolved by mutual consent.
Commercialization. Under the terms of the AG-881 Agreements, we will lead commercialization of licensed AG-881 products within the United States and Celgene will lead commercialization of licensed AG-881 products outside of the United States. Depending on the market, the parties will each have the right to provide a portion of field-based marketing activities.
Opt-out right. Under the AG-881 Agreements, we may elect to opt out of the cost and profit split of the collaboration at any time after April 27, 2016 by providing at least 12 months written notice to Celgene. If we opt out, Celgene will have the sole right to develop, manufacture and commercialize licensed AG-881 products throughout the world, at its cost,TMPRSS6 gene, and we will undertake transitional activities reasonably necessaryintend to transfer thepursue development manufacture and commercialization of a licensed AG-881 products to Celgene, at our cost.
If we elect to opt-out of the AG-881 Agreements, then, in lieu of the profit or loss sharing described above, we would be eligible to receive royalties at tiered, low- to mid-teen percentage rates on Celgene’s net sales of licensed AG-881 products.
Term. The term of the AG-881 Agreements will continue, unless earlier terminated, as described below, as long as we and Celgene continue to develop or commercialize licensed AG-881 products, or, in the event we opt out of the AG-881 Agreements, until expiration of the royalty term for AG-881 products.
Termination Celgene may terminate the AG-881 Agreements in their entirety for any reason upon ninety days written notice to us. Either party may terminate the AG-881 Agreementsproduct for the insolvencypotential treatment of the other party. Either party may terminate the AG-881 Agreements in their entirety orpatients with respect to one of the agreements upon prior written notice to the other party in the case of an uncured material breach by the other party that frustrates the fundamental purpose of the AG-881 Agreements. If one of the AG-881 Agreements terminates, the other will terminate automatically.
Exclusivity. Until termination or expiration of the AG-881 Agreements, neither we nor Celgene may directly or indirectly develop, manufacture or commercialize, outside of the AG-881 Agreements or the 2010 Agreement, any therapeutic modality with specified activity against both IDH1 and IDH2.
2010 Agreement
In April 2010, we entered into a collaboration agreement with Celgene focused on cancer metabolism, or the 2010 Agreement. The 2010 Agreement was amended in October 2011 and July 2014. The goal of the collaboration was to discover, develop and commercialize disease-altering therapies in oncology based on our cancer metabolism research platform. We initially led discovery, preclinical and early clinical development for all cancer metabolism programs under the collaboration. The discovery phase of the 2010 Agreement expired in April 2016.
Upon agreement to terminate the 2010 Agreement, effective as of August 15, 2016, as to the program directed to the IDH1 target, for which ivosidenib is the lead development candidate, the sole program remaining under the 2010 Agreement is IDHIFA®, a co-commercialized licensed program for which Celgene leads and funds global development and commercialization activities. We have exercised our right to participate in a portion of commercialization activities in the United States for IDHIFA® in accordance with the applicable commercialization plan.
Exclusivity. Until termination or expiration of the agreement, either in its entirety or with respect to the relevant program, we may not directly or indirectly develop, manufacture or commercialize, outside of the collaboration, any therapeutic modality with specified activity against any collaboration target that is within a licensed program or against any former collaboration target against which Celgene is conducting an independent program under the agreement.
Financial terms. Under the remaining terms of the 2010 Agreement, we are eligible to receive up to $95.0 million in potential milestone payments for the IDHIFA® program. The potential milestone payments are comprised of: (i) up to $70.0 million in milestone payments upon achievement of specified ex-U.S. regulatory milestone events, and (ii) a $25.0 million milestone payment upon achievement of a specified commercial milestone event.
Under the 2010 Agreement, we may also receive royalties at tiered, low-double digit to mid-teen percentage rates on net sales of IDHIFA®. Assuming all other revenue recognition criteria are met, royalty payments will be recognized as revenue in the period in which they are earned. During the year ended December 31, 2017, we earned $1.9 million in royalty revenue under the 2010 Agreement.
Termination. Unless terminated earlier by either party, the term of the 2010 Agreement will continue until the expiration of all royalty terms with respect to IDHIFA®. Celgene may terminate the 2010 Agreement for convenience in its entirety or with respect to IDHIFA® upon ninety days written notice to us. Either we or Celgene may terminate the 2010 Agreement, in its entirety or with respect to IDHIFA®, if the other party is in material breach and fails to cure such breach within the specified cure period. Either we or Celgene may terminate the 2010 Agreement in the event of specified insolvency events involving the other party.

If Celgene terminates the 2010 Agreement as a result of our uncured material breach, then certain of our rights and certain of Celgene’s obligations described above would change with respect to the terminated program(s), including, for example: the licenses we granted to Celgene would become perpetual; milestone payments to which we may be entitled may be reduced or eliminated; and royalties to which we may be entitled may be reduced or eliminated.
If Celgene terminates the 2010 Agreement for convenience or if we terminate the agreement as a result of Celgene’s uncured material breach, the license we granted to Celgene with respect to IDHIFA® will end, and we will have specified rights for, and Celgene will take specified actions to assist us in continuing, the development, manufacture and commercialization of medicines from the IDHIFA® program.PV.
Intellectual Property
Our commercial success depends in part on our ability to obtain and maintain proprietary or intellectual property protection for our product candidates and our core technologies, including novel biomarker and diagnostic discoveries, and other know-how, to operate without infringing on the proprietary rights of others and to prevent others from infringing on our proprietary or intellectual property rights. Our policy is to seek to protect our proprietary and intellectual property position by, among other methods, filing U.S.United States and foreign patent applications related to our proprietary technology, inventions and improvements that are important to the development and implementation of our business. We also rely on trade secrets,confidential information, know-how, in-licensing opportunities and continuing technological innovation to develop and maintain our proprietary and intellectual property position. We may also choose to rely on trade secrets to protect certain aspects of our business that are not suitable or appropriate for patent protection.
We file, or may collaborate with third parties to file, patent applications directed to our key products and product candidates, including IDHIFA®PYRUKYND®, ivosidenib, AG-881, AG-348AG-946 and AG-270,AG-181, in addition to related compounds and potential back-up compounds, in an effort to establish intellectual property positions regardingto protect these new chemical entities relating to these product candidates as well as usesmethods of new chemical entitiesusing these compounds in the treatment of diseases.diseases, formulations, solid state forms, and manufacturing processes. We may also seek patent protection with respect tofor certain biomarkers that may be useful in selectingidentifying the rightappropriate patient population for therapies with our product candidates. As of January 31, 2018 we owned or licensed approximately 16
PK activator program
The patent portfolio for our PK activator program contains issued U.S. patents 26and pending U.S. patent applications, 75 issued foreign patents, 327 pending foreign patent applications, and 12 pending Patent Cooperation Treaty, or PCT, patent applications directed to our key product candidates.compositions of matter for PYRUKYND®, as well as to related compounds, various solid state forms of PYRUKYND®, compositions of matter for additional PKR activators, such as AG-946, as well as various solid state forms, methods of use and methods of manufacture for AG-946 and other novel compounds. As of February 1, 2024, we owned 16 issued United States patents and 401 issued foreign patents, and have pending patent applications in the United States and in various foreign jurisdictions. The patents that have issued or will issue for PYRUKYND® will have a statutory expiration date of at least 2030 to 2042, and the patents that have issued or will issue for AG-946 will have a statutory expiration date of at least 2038 to 2044. Patent term adjustments or patent term extensions could result in later expiration dates. In some cases, the term of a United States patent can be shortened by the filing of a terminal disclaimer which operates to reduce the term of a patent to that of an earlier expiring patent. The foreign issued patents and pending patent applications are in a number of jurisdictions, including
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Argentina, Australia, Austria, Belgium, Brazil, Canada, China, the Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Ireland, Italy, Japan, Lebanon, Lithuania, Mexico, the Netherlands, Norway, Poland, Portugal, Romania, Russia, Saudi Arabia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Taiwan, Turkey, and the United Kingdom.
The intellectual property portfolios for our most advanced programs as of January 31, 2018 are summarized below. Prosecution is a lengthy process, during which the scope of the claims initially submitted for examination by the U.S. Patent and Trademark Office, or USPTO, can be significantly narrowed by the time they issue, if they issue at all. We expect this could be the case with respect to some of our pending patent applications referred to below.above.
IDH mutant inhibitor programsPAH stabilizer program
The intellectual propertypatent portfolio for our IDH mutant inhibitor programsPAH stabilizer program contains an issued patent and pending patent applications directed to compositions of matter for IDHIFA®, ivosidenib, and AG-881, as well as analogs thereof, and compositions of matter for IDH mutant inhibitors with different compound families, as well as methods of use for theseAG-181 and other novel compounds and diagnostic methods for detecting various IDH1 and IDH2 mutations.PAH stabilizers. As of January 31, 2018,February 1, 2024, we owned approximately 10 issued U.S. patents, 10one issued foreign patents, 20patent and have pending U.S. patent applications, 270 pending foreign patent applications in a number of jurisdictions,the United States and 10 pending PCTin various foreign jurisdictions. We expect to file national stage patent applications directed to our IDH mutant product candidates.in additional foreign jurisdictions in accordance with Patent Cooperation Treaty timelines. The patents that have been issued or will issue for our IDH mutant product candidatesPAH stabilizer program will have a statutory expiration date of at least 2033 to 2034.2043. Patent term adjustments or patent term extensions could result in later expiration dates.
PK deficiency program
The intellectual property portfolio In some cases, the term of a United States patent can be shortened by the filing of a terminal disclaimer which operates to reduce the term of a patent to that of an earlier expiring patent. Prosecution is a lengthy process, during which the scope of the claims initially submitted for examination can be significantly narrowed by the time they issue, if they issue at all. We expect this could be the case with respect to some of our PK deficiency program containspending patent applications directedreferred to compositions of matter for AG-348, as well as analogs thereof, and compositions of matter for PKR activators with different compound families, as well as methods of use for these novel compounds. As of January 31, 2018, we owned approximately six issued U.S. patents, 65 issued foreign patents, five pending U.S. patent applications and 55 pending foreign patent applications in a number of jurisdictions directed to our PK deficiency program, including our product candidate. The patents that have issued or will issue for our PK deficiency program will have a statutory expiration date of at least 2030. above.
Patent term adjustments or patent term extensions could result in later expiration dates.
MTAP-deleted cancer program
The intellectual property portfolio for our MTAP-deleted cancer program contains patent applications directed to compositions of matter for AG-270, as well as analogs thereof and other compound families, as well as methods of use for these novel compounds and diagnostic methods for detecting MTAP deletions. As of January 31, 2018, we owned approximately one pending U.S. patent application, two pending foreign patent applications, and two pending PCT patent applications directed to

our MTAP-deleted cancer program. The patents that would issue for our MTAP-deleted cancer program will have a statutory expiration date of at least 2037. Patent term adjustments or patent term extensions could result in later expiration dates.Term
The term of individual patents depends upon the legal term for patents in the countries in which they are obtained. In most countries, including the United States, the patent term is 20 years from the earliest filing date of a non-provisional patent application.application, although term extensions may be available. In the United States, a patent’s term may be lengthened by patent term adjustment, which compensates a patentee for administrative delays by the United States Patent and Trademark Office, or USPTO, in examining and granting a patent or may be shortened if a patent is terminally disclaimed over an earlier filed patent. The term of a patent that covers a drug or biological product may also be eligible for patent term extension when FDA approval is granted, provided statutory and regulatory requirements are met. The extension of the term of foreign patents varies, in accordance with local law. Although certain of the patents granted by the regulatory authorities of the EU may expire at specific dates, the terms of patents granted in certain European countries may extend beyond such EU patent expiration date if we were to obtain a supplementary protection certificate. In addition, because of the extensive time required for clinical development and regulatory review of a product candidate we may develop, it is possible that, before any of our product candidates can be commercialized, any related patent may expire or remain in force for only a short period following commercialization, thereby reducing any advantage of any such patent.
In the future, if and when our product candidates receive approval by the FDA or foreign regulatory authorities, we expect to apply for patent term extensions on issued patents covering those products, depending upon the length of the clinical trials for each medicineproduct candidate and other factors. There can be no assurance that any of our pending patent applications will issuebe issued or that we will benefit from any patent term extension or favorable adjustment to the term of any of our patents.
Additional Considerations
As with other biotechnology and pharmaceutical companies, our ability to maintain and solidify our proprietary and intellectual property position for our product, product candidates and technologies will depend on our success in obtaining effective patent claims and enforcing those claims if granted. However, patent applications that we may file or license from third parties may not result in the issuance of patents. We also cannot predict the breadth of claims that may be allowed or enforced in our patents. Any issued patents that we may receive in the future may be challenged, invalidated or circumvented. For example, we cannot be certaina third party can challenge the patentability of one or more of the priorityclaims of inventions covered by pending third-partyan issued patent applications. Ifin a post-grant proceeding before the USPTO or a foreign patent office such as the European Patent Office, which can result in the loss of certain claims or the loss of an entire patent. In addition, it is possible that a third parties prepare and fileparty has filed a patent applicationsapplication in the United States, or abroad, that also claimclaims the same technology or therapeutics to which we have rights,chemical structures that are claimed in our own patent applications or patents. In such cases, we may have to participate in interferencelegal proceedings in the USPTO to determine priority of invention,or enter into a licensing arrangement, which could result in substantial costs to us, even if the eventual outcome is favorable to us. In addition because of the extensive time required for clinical development and regulatory review of a product candidateto patent protection, we may develop, it is possible that, before any of our product candidates can be commercialized, any related patent may expire or remain in force for only a short period following commercialization, thereby reducing any advantage of any such patent.
In addition to patents, wealso rely upon unpatented trade secrets andconfidential information, including confidential technical information, know-how and continuing technological innovation to develop and maintain our competitive position. We seek to protect our proprietary information, in part, by using confidentiality agreements with our collaborators, third-party service providers, scientific advisors, employees and consultants, and by invention assignment agreements with our employees. We also have agreements requiring assignment of inventions with selected consultants, scientific advisors and collaborators. The confidentiality agreements are designed to protect our proprietary information and, in the case of agreements or clauses requiring invention assignment, to grant us ownership of technologies that are developed through a relationship with a third party.
With respect to our proprietary cellular metabolism technology platform, we consider trade secrets and know-how to be our primary intellectual property. Trade secrets Nevertheless, confidential information and know-how can be difficult to protect. In particular, we anticipate that with respect to this technology platform, these trade secretsat least some of our technical information and know-how will, over time, be disseminatedbecome
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known within the industry through independent development, the publication of journal articles, describing the methodology, and the movement of personnel skilled in the art from academic to industry scientific positions.
Competition
The pharmaceutical and biotechnology industries are characterized by rapidly advancing technologies, intense competition and a strong emphasis on proprietary products. While we believe that our technology, development experience and scientific knowledge provide us with competitive advantages, we face potential competition from many different sources, including major pharmaceutical, specialty pharmaceutical and biotechnology companies, academic institutions and governmental agencies, and public and private research institutions. AnyPYRUKYND® and any product candidates that we successfully develop and commercialize will compete with existing therapies and new therapies that may become available in the future.
We compete in the segments of the pharmaceutical, biotechnology and other related markets that address cancer metabolism, MIOrare diseases, particularly hemolytic anemias, PKU and RGDs.PV. There are other companies working to develop rare disease therapies, in the fields of cancer metabolism, MIO and RGDs. These companies includeincluding divisions of large pharmaceutical companies and biotechnology companies of various sizes.
Cancer. In the field of cancer metabolism, our principalOur competitors include AstraZeneca Plc.; Bayer AG,but are not limited to: Bristol-Myers Squibb Company, or Bayer; Calithera Biosciences; Cornerstone Pharmaceuticals,BMS; BioMarin Pharmaceutical, Inc.; Daiichi Sankyo Company, Ltd., or Daiichi Sankyo; Eli Lilly and Company; Forma Therapeutics Holdings, LLC,BioMarin; bluebird bio, Inc., or Forma; GlaxoSmithKline plc;bluebird; Merck & Co.;, Inc., or Merck; Novartis International AG, or Novartis; Novo Nordisk A/S, or Novo; Pfizer, Inc.;, or Pfizer; Rocket Pharmaceuticals, Inc., or Rocket Pharma; Vertex Pharmaceuticals Incorporated, or Vertex; CRISPR Therapeutics AG, or CRISPR; Emmaus Life Sciences, Inc., or Emmaus; Fulcrum Therapeutics, Inc., or Fulcrum; Geron Corporation, or Geron; Keros Therapeutics, Inc., or Keros; PTC Therapeutics, Inc., or PTC; Jnana Therapeutics Inc., or Jnana; Homology Medicines Inc., or Homology; Silence Therapeutics plc, or Silence; Protagonist Therapeutics, Inc., or Protagonist; Ionis Pharmaceuticals, Inc., or Ionis; PharmaEssentia USA Corporation, or PharmaEssentia; and Roche Holdings, Inc. and its subsidiary Genentech, Inc. For example, Bayer, Daiichi Sankyo and Forma are conducting phase 1 clinical trials of their IDH mutant inhibitors, BAY1436032, DS-1001b and FT-2102, respectively, in patients with hematologic and solid tumors, including AML, MDS and glioma. The most common methods of treating patients with cancer are surgery, radiation and drug therapy, including chemotherapy, hormone therapy and targeted drug therapy. There are a variety of available drug therapies marketed for cancer. In many cases, these drugs are administered in combination to

enhance efficacy. While our product candidates may compete with many existing drug and other therapies, to the extent they are ultimately used in combination withIncyte Corporation, or as an adjunct to these therapies, our product candidates will not be competitive with them. Some of the currently approved drug therapies are branded and subject to patent protection, and others are available on a generic basis. Many of these approved drugs are well-established therapies and are widely accepted by physicians, patients and third-party payors. In general, although there has been considerable progress over the past few decades in the treatment of cancer and the currently marketed therapies provide benefits to many patients, these therapies all are limited to some extent in their efficacy and frequency of adverse events and none are successful in treating all patients. As a result, the level of morbidity and mortality from cancer remains high.
In addition to currently marketed therapies, there are also a number of medicines in late stage clinical development to treat cancer, including immuno-oncology therapies. These medicines in development may provide efficacy, safety, convenience and other benefits that are not provided by currently marketed therapies. As a result, they may provide significant competition for any of our product candidates for which we obtain market approval. For example, several investigators have reported that IDH mutant AML and glioma are sensitive to poly (ADP-ribose) polymerase inhibition in cell culture and animal models. In the MIO field, our principal competitors include AstraZeneca PLC, Merck, Genentech, Bristol-Myers Squibb Company and Novartis.
Rare genetic diseases. In the field of RGDs, our principal competitors include Alexion Pharmaceuticals, Inc.; BioMarin Pharmaceutical, Inc.; Genzyme Corporation, a Sanofi company; and Shire Plc. In addition, Rocket Pharma LTD is in the preclinical stages of development of a gene therapy to treat patients with PK deficiency.Incyte.
The most common methods for treating patients with RGDs arerare diseases include dietary restriction, dietary supplementation or replacement, treatment of symptoms and complications, gene therapy, organblood transfusions, phlebotomies, stem cell transplant and enzyme replacement therapies. ThereERTs and there are a number ofseveral marketed enzyme replacement therapies available for treating patients with RGDs. In some cases, these treatment methods are used in combination to improve efficacy.hemolytic anemias, PKU and PV. For example, recently approved treatments for thalassemia, SCD, LR MDS, PKU and PV include Reblozyl® from Merck/BMS (formerly Acceleron/BMS); Revlimid® from BMS; Zynteglo® and Lyfgenia® from bluebird; Adakveo® from Novartis; Oxbryta® from Pfizer; Casgevy® from Vertex/CRISPR; Kuvan® and Palynziq® from BioMarin; Endari® from Emmaus; Besremi® from PharmaEssentia; and Jakafi® from Incyte. While our product and product candidates may compete with existing medicines and other therapies, to the extent they are ultimately used in combination with or as an adjunct to these therapies, our product or product candidates willmay not be competitive with them. In addition to currently marketed therapies, there are also a number ofseveral products that are either enzyme replacement therapiessmall molecules, biologics, ERTs or gene therapies in various stages of clinical development to treat RGDs.hemolytic anemias, PKU and PV. For example, Rocket Pharma is conducting a clinical trial of a gene therapy targeting PK deficiency; Novo is developing etavopivat (a PKR activator) for the treatment of hemolytic anemias, including alpha and beta thalassemia, SCD and MDS; Pfizer is developing inclacumab and GBT-601 for the treatment of SCD; Geron is developing imetelstat for the treatment of LR MDS (for which they have a Prescription Drug User Fee Act, or PDUFA, goal date of June 16, 2024 for their new drug application); Fulcrum is developing pociredir (FTX-6058) in SCD; Keros is developing KER-050 for the treatment of anemia in LR MDS; a number of companies, including PTC, Jnana and Homology are developing therapies to treat PKU; and a number of companies, including Silence, Protagonist and Ionis are developing therapies to treat PV. These products in development may provide efficacy, safety, convenience and other benefits that are not provided by currentlycurrent marketed therapies.therapies or the current standards of care. As a result, they may provide significant competition for any of our product or product candidates for which we obtain market approval.
Many of our competitors may have significantly greater financial resources and expertise in research and development, manufacturing, preclinical testing, conducting clinical trials, obtaining regulatory approvals and globally marketing approved medicines than we do. Mergers and acquisitions in the pharmaceutical, biotechnology and diagnostic industries may result in even more resources being concentrated among a smaller number of our competitors. These competitors also compete with us in recruiting and retaining qualified scientific and management personnel, and establishing clinical trial sites and patient registration for clinical trials, as well as in acquiring or in-licensing technologies complementary to, or necessary for, our programs. Smaller or early stageearly-stage companies may also prove to be significant competitors, particularly through collaborative arrangements with large and established companies.
The key competitive factors affecting the success of allPYRUKYND® and any of our product candidates that we develop, if approved, are likely to be their efficacy, safety, convenience, price, the effectiveness of companion diagnostics in guiding the use of related therapeutics where appropriate, the level of generic competition and the availability of reimbursement from government and other third-party payors.
Our commercial opportunity could be reduced or eliminated if our competitors develop and commercialize medicines that are safer, more effective, have fewer or less severe side effects, are more convenient or are less expensive than any medicines that we may develop. Our competitors also may obtain FDA or other regulatory approval for their medicines more rapidly than we
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may obtain approval for ours, which could result in our competitors establishing a strong market position before we are able to enter the market. In addition, our ability to compete may be affected in many cases by insurers or other third-party payors seeking to encourage the use of generic or other branded medicines. There are many generic medicines currently on the market for the indications that we are pursuing, and additional medicines are expected to become available on a generic basis over the coming years. IfWe expect that PYRUKYND® and any of our therapeutic product candidates are approved, we expect that theymay receive marketing approval in the future will be priced at a significant premium over competitive generic medicines.
Manufacturing and Supply Chain
We do not own or operate,PYRUKYND®, AG-946, and currently have no plans to establish, any manufacturing facilities. We currently rely, and expect to continue to rely, on third parties for the manufacture of our product candidates for preclinical and clinical testing, as well as for commercial manufacture of any products that we may commercialize. To date, we have obtained materials for IDHIFA®, ivosidenib, AG-881, AG-348, and AG-270 for our ongoing and planned clinical testing from third-party manufacturers. Although we have long-term supply arrangements in place for the commercial supply of ivosidenib, we primarily obtain our

supplies from these manufacturers on a purchase order basis. We do not currently have arrangements in place for redundant supply for bulk drug substance and drug product. As we have done for ivosidenib, for all of our other product candidates, we intend to identify and qualify additional manufacturers to provide the active pharmaceutical ingredient and fill-and-finish services prior to submission of a NDA to the FDA.
IDHIFA®, ivosidenib, AG-881, AG-348, and AG-270AG-181 are organic compounds of low molecular weight, generally called small molecules. TheyOur siRNA program targeting the TMPRSS6 gene is an oligonucleotide intended for use as a sterile parenteral administration. Each can be manufactured in reliable and reproducible synthetic processes from readily available starting materials. The chemistry is amenable to scale-up and does not require unusual equipment in the manufacturing process. We expect to continue to develop drugproduct candidates that can be produced cost-effectively at contract manufacturing facilities.
We generallydo not own or operate, and currently have no plans to establish, any manufacturing or supply chain related facilities. We currently, and expect to continue to, rely on third parties for the manufacture and salesupply of our clinical and preclinical product candidates, as well as for commercial manufacture of PYRUKYND® and any companion diagnosticsproduct for which we develop.may receive marketing approval in the future. We conduct extensive prequalification programs to ensure the compliance, quality and reliability of third-party manufacturing and supply operations.
ResearchTo date, we have obtained materials for PYRUKYND®, AG-946, AG-181 and Development Expensesour siRNA program for our ongoing and planned clinical testing and ongoing preclinical testing from third-party manufacturers. We have long-term commercial manufacture and supply agreements in place for PYRUKYND®, and we obtain our supplies from these manufacturers on a purchase order basis.
ForDue to the years ended December 31, 2017, 2016volatility of the supply networks globally, we have gained regulatory approval for redundant supply of raw materials and 2015, company-sponsoredactive pharmaceutical ingredient, or API, for PYRUKYND®, and have an ongoing program to ensure this risk mitigation remains effective, including establishing safety stocks. We do not currently have arrangements in place for redundant supply for drug product, but maintain a broad safety stock program. As we have done for PYRUKYND®, we intend to identify and qualify additional manufacturing and supply related services for our other product candidates.
Government Regulation and Product Approvals
Government authorities in the United States, at the federal, state and local level, and in other countries and jurisdictions, including the EU, extensively regulate, among other things, the research, development, testing, manufacture, pricing, quality control, approval, packaging, storage, recordkeeping, labeling, advertising, promotion, distribution, marketing, post-approval monitoring and development expenses were $292.7 million, $220.2 million,reporting, and $141.8 million, respectively.import and export of biopharmaceutical products. The processes for obtaining marketing approvals in the United States and in foreign countries and jurisdictions, along with compliance with applicable statutes and regulations and other regulatory authorities, require the expenditure of substantial time and financial resources.
ReviewApproval and ApprovalRegulation of Drugs in the United States
In the United States, the FDA regulates drug products are regulated under the Federal Food, Drug and Cosmetic Act, or FDCA, and applicable implementing regulations. The process of obtaining regulatory approvalsregulations and the subsequent compliance with appropriate federal, state, localguidance. A company, institution, or organization responsible for initiating and foreign statutes and regulations requires the expenditure of substantial time and financial resources. The failure to comply with applicable requirements under the FDCA and other applicable laws at any time during the product development process, approval process or after approval may subject an applicant and/or sponsor to a variety of administrative or judicial sanctions, including refusal by the FDA to approve pending applications, withdrawal of an approval, imposition ofmanaging a clinical hold, issuance of warning lettersdevelopment program for such products, and other types of letters, product recalls, product seizures, total or partial suspension of production or distribution, injunctions, fines, refusals of government contracts, restitution, disgorgement of profits, or civil or criminal investigations and penalties brought by the FDA and the Department of Justice or other governmental entities.for their regulatory approval, is typically referred to as a sponsor.
An applicantA sponsor seeking approval to market and distribute a new drug product in the United States generally must typically undertakesatisfactorily complete each of the following:following steps before the product candidate will be approved by the FDA:
completion of preclinical testing including laboratory tests, animal studies and formulation studies which must be performed in complianceaccordance with the FDA’s good laboratory practice, or GLP, regulations;regulations and standards;
design of a clinical protocol and submission to the FDA of an IND for human clinical testing, which must take effectbecome effective before human clinical trials may begin;
approval by an independent institutional review board, or IRB, representing each clinical site before each clinical trial may be initiated;
performance of adequate and well‑controlledwell-controlled human clinical trials in accordance with good clinical practices, or GCP, to establish the safety and efficacy of the proposed drug product candidate for each indication;proposed indication, in accordance with current good clinical practices, or GCP;
preparation and submission to the FDA of an NDA;NDA for a drug product which includes not only the results of the clinical trials, but also, detailed information on the chemistry, manufacture and quality controls for the product candidate and proposed labeling for one or more proposed indication(s);
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review of the product candidate by an FDA advisory committee, where appropriate or if applicable;
satisfactory completion of one or more FDA inspectionsinspection of the manufacturing facility or facilities, including those of third parties, at which the product candidate or components thereof are producedmanufactured to assess compliance with current Good Manufacturing Practices,good manufacturing practices, or cGMP, requirements and to assure that the facilities, methods and controls are adequate to preserve the product’s identity, strength, quality and purity;
satisfactory completion of any FDA audits of the non-clinical and clinical trial sites to assure compliance with GCPsGCP and the integrity of clinical data in support of the clinical data;NDA;
payment of user fees and securing FDA approval of the NDA;NDA to allow marketing of the new drug product; and
compliance with any post‑approvalpost-approval requirements, including Risk Evaluationthe potential requirement to implement risk evaluation and Mitigation Strategies,mitigation strategies, or REMS, and post‑approvalthe potential requirement to conduct any post-approval studies required by the FDA.

Preclinical studiesStudies
Before a sponsor begins testing a product candidate with potential therapeutic value in humans, the product candidate enters the preclinical testing stage. Preclinical studiestests include laboratory evaluationevaluations of product chemistry, formulation and stability and other studies to evaluate, among other things, the toxicity of the purity and stability of the manufactured drug substance or active pharmaceutical ingredient and the formulated drug or drug product as well as in vitro and animal studies to assess the safety and activity of the drug for initial testing in humans and to establish a rationale for therapeutic use.candidate. The conduct of the preclinical studies is subject totests and formulation of the compounds for testing must comply with federal regulations and requirements, including GLP regulations.regulations and standards, and the United States Department of Agriculture’s Animal Welfare Act, if applicable. The results of the preclinical tests, together with manufacturing information and analytical data, any available clinical data or literature and plans for clinical trials, among other things, are submitted to the FDA as part of an IND.IND and are typically referred to as IND-enabling studies. Some long‑term preclinical testing, such as animal tests of reproductive adverse events and carcinogenicity, may continue after the IND is submitted.
Companies usually must complete some long‑termlong-term preclinical testing, such as animal tests of reproductive adverse events and carcinogenicity, and must also develop additional information aboutlong-term toxicity studies, may continue after the chemistry and physical characteristics of the investigational product and finalize a process for manufacturing the product in commercial quantities in accordance with cGMP requirements. The manufacturing process must be capable of consistently producing quality batches of the product candidate and, among other things, the manufacturer must develop methods for testing the identity, strength, quality and purity of the final product. Additionally, appropriate packaging must be selected and tested and stability studies must be conducted to demonstrate that the product candidate does not undergo unacceptable deterioration over its shelf life.IND is submitted.
The IND and IRB processesProcesses
An IND is an exemption from the FDCA that allows an unapproved drugproduct candidate to be shipped in interstate commerce for use in an investigational clinical trial and a request for FDA authorization to administer ansuch investigational drugproduct to humans. Such authorization must be secured prior to interstate shipment and administration of any new drugproduct candidate that is not the subject of an approved NDA. In addition to reviewing an IND to assure the safety and rights of patients, the FDA also focuses on the quality of the investigation and whether it will be adequate to permit an evaluation of the drug's safety and efficacy. In support of a request for an IND, applicantssponsors must submit a protocol for each clinical trial and any subsequent protocol amendments must be submitted to the FDA as part of the IND. In addition, the results of the preclinical tests, together with manufacturing information, analytical data, any available clinical data or literature and plans for clinical trials, among other things, are submitted to the FDA as part of an IND. The FDA requires a 30‑day30-day waiting period after the filing of each IND before clinical trials may begin. This waiting period is designed to allow the FDA to review the IND to determine whether human research subjects will be exposed to unreasonable health risks. At any time during this 30‑day30-day period, or thereafter, the FDA may raise concerns or questions about the conduct of the trials as outlined in the IND and impose a clinical or partial clinical hold. In this case, the IND sponsor and the FDA must resolve any outstanding concerns before clinical trials can begin.
Following commencement of a clinical trial under an IND, the FDA may also place a clinical hold or partial clinical hold on that trial. A clinical hold is an order issued by the FDA to the sponsor to delay a proposed clinical investigation or to suspend an ongoing investigation. A partial clinical hold is a delay or suspension of only part of the clinical work requested under the IND. For example, a specific protocol or part of a protocol is not allowed to proceed, while other protocols may do so. No more than 30 days after imposition of a clinical hold or partial clinical hold, the FDA will provide the sponsor a written explanation of the basis for the hold. Following issuance of a clinical hold or partial clinical hold, an investigation may only resume after the FDA has notified the sponsor that the investigation may proceed. The FDA will base that determination on information provided by the sponsor correcting the deficiencies previously cited or otherwise satisfying the FDA that the investigation can proceed.
A sponsor may choose, but is not required, to conduct a foreign clinical study under an IND. When a foreign clinical study is conducted under an IND, all FDA IND requirements must be met unless waived. When thea foreign clinical study is not conducted under an IND, the sponsor must ensure that the study complies with certain FDA regulatory requirements, in orderincluding GCP requirements, of the FDA to use the study as support for an IND or application for marketing approval. Specifically, on April 28, 2008, the FDA amended its regulations governing the acceptance of foreign clinical studies not conducted under an IND as support for an IND or an NDA. The final rule provides that such studies must be conducted in accordance with GCP including review and approval by an independent ethics committee, or IEC, and informed consent from subjects. The GCP requirements in the final rule encompass both ethical and data integrity standards for clinical studies. The FDA’s regulations are intended to help ensure the protection of human subjects enrolled in non‑INDnon-IND foreign clinical studies, as well as the quality and integrity of the resulting data. They further help ensure that non‑INDnon-IND foreign studies are conducted in a manner comparable to that required for IND studies.
In addition to the foregoing IND requirements, an IRB representing each institution participating in the clinical trial must review and approve the plan for any clinical trial before it commences at that institution, and the IRB must conduct a continuing review and reapprove the study at least annually. The IRB must review and approve, among other things, the study protocol and informed consent information to be provided to study subjects. An IRB must operate in compliance with FDA regulations. An IRB can suspend or terminate approval of a clinical trial at its institution, or an institution it represents, if the clinical trial is not
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being conducted in accordance with the IRB’s requirements or if the product candidate has been associated with unexpected serious harm to patients.
Additionally, some trials are overseen by an independent group of qualified experts organized by the trial sponsor, known as a data safety monitoring board or committee or DSMB.committee. This group provides authorization foras to whether or not a trial may move forward at designated check points based on access that only the group maintains to available data from the study. Suspension

or termination of development during any phase of clinical trials can occur if it is determined that the participants or patients are being exposed to an unacceptable health risk. Other reasons for suspension or termination may be made by us based on evolving business objectives and/or competitive climate.
Information aboutReporting Clinical Trial Results
Under the Public Health Service Act, sponsors of certain clinical trials must be submitted within specific timeframesof certain FDA-regulated products, including prescription drugs and biologics, are required to register and disclose certain clinical trial information on a public registry (clinicaltrials.gov) maintained by the NIH. Information related to the National Institutesproduct, patient population, phase of Health, investigation, study sites and investigators and other aspects of the clinical trial is made public as part of the registration of the clinical trial. With the issuance of pre-notices for voluntary corrective action and several notices of non-compliance during the past two years, the FDA has signaled the government’s willingness to enforce these requirements against non-compliant clinical trial sponsors. While these notices of non-compliance did not result in civil monetary penalties, the failure to submit clinical trial information to clinicaltrials.gov is a prohibited act under the FDCA with violations subject to potential civil monetary penalties of up to $10,000 for each day the violation continues. Violations may also result in injunctions and/or NIH,criminal prosecution or disqualification from federal grants.
Expanded Access to an Investigational Drug for public disseminationTreatment Use
Expanded access, sometimes called “compassionate use,” is the use of investigational new drug products outside of clinical trials to treat patients with serious or immediately life-threatening diseases or conditions when there are no comparable or satisfactory alternative treatment options. The rules and regulations related to expanded access are intended to improve access to investigational drugs for patients who may benefit from investigational therapies. FDA regulations allow access to investigational drugs under an IND by the company or the treating physician for treatment purposes on a case-by-case basis for: individual patients (single-patient IND applications for treatment in emergency settings and non-emergency settings); intermediate-size patient populations; and larger populations for use of the drug under a treatment protocol or Treatment IND Application.
While there is no obligation to make investigational products available for expanded access, sponsors are required to make policies for evaluating and responding to requests for expanded access publicly available upon the earlier of initiation of a Phase 2 or Phase 3 clinical trial, or 15 days after the drug or biologic receives designation as a breakthrough therapy, fast track product, or regenerative medicine advanced therapy.
In addition, the Right to Try Act, among other things, provides a federal framework for certain patients to access certain investigational new drug products that have completed a Phase 1 clinical trial and are undergoing investigation for FDA approval. Under certain circumstances, eligible patients can seek treatment without enrolling in clinical trials and without obtaining FDA permission under the FDA expanded access program. There is no obligation for a drug manufacturer to make its ClinicalTrials.gov website.drug products available to eligible patients as a result of the Right to Try Act, but the manufacturer must develop an internal policy and respond to patient requests according to that policy.
Human clinical trialsClinical Trials in supportSupport of an NDA
Clinical trials involve the administration of the investigational product candidate to human subjects under the supervision of a qualified investigatorsinvestigator in accordance with GCP requirements which include, among other things, the requirement that all research subjects provide their informed consent in writing before their participation in any clinical trial. Clinical trials are conducted under written studyclinical trial protocols detailing, among other things, the objectives of the study, inclusion and exclusion criteria, the objectives of the study, the parameters to be used in monitoring safety and the effectiveness criteria to be evaluated.
Human clinical trials are typically conducted in three sequential phases, whichbut the phases may overlap or be combined:combined.
Phase 1. The drug is1 clinical trials are initially introduced into healthy human subjects or,conducted in certain indications such as cancer, patients witha limited population to test the target disease or condition and testedproduct candidate for safety, dosageincluding AEs, dose tolerance, absorption, metabolism, distribution, excretion and if possible,pharmacodynamics in healthy humans or in patients. During Phase 1 clinical trials, information about the investigational drug product’s pharmacokinetics and pharmacological effects may be obtained to gain an early indicationpermit the design of its effectivenesswell-controlled and to determine optimal dosage.
scientifically valid Phase 2 clinical trials.
Phase 2. The drug is administered to a limited patient population2 clinical trials are generally conducted to identify possible adverse effectsAEs and safety risks, to preliminarily evaluate the efficacy of the product candidate for specific targeted diseasesindications, and to determine dosagedose tolerance and optimal dosage. Multiple Phase 2 clinical trials may be conducted by the sponsor to obtain information prior to beginning larger and more costly Phase 3 clinical trials. Phase 2 clinical trials are well controlled, closely monitored and conducted in a limited patient population.
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Phase 3. The drug3 clinical trials proceed if the Phase 2 clinical trials demonstrate that a dose range of the product candidate is administered topotentially effective and has an acceptable safety profile. Phase 3 clinical trials are undertaken within an expanded patient population generallyto further evaluate dosage, provide substantial evidence of clinical efficacy, and further test for safety in an expanded and diverse patient population at multiple, geographically dispersed clinical trial sites,sites. The FDA may require more than one Phase 3 clinical trial to support approval of a product candidate. A well-controlled, statistically robust Phase 3 clinical trial may be designed to deliver the data that regulatory authorities will use to decide whether or not to approve, and, if approved, how to appropriately label a drug; such Phase 3 clinical trials are referred to as “pivotal.” A Phase 2 clinical trial can be a “pivotal” trial if the design provides a well-controlled and reliable assessment of clinical benefit, particularly in well‑controlledan area of unmet medical need. A company’s designation of the phase of a trial is not necessarily indicative that the trial will be sufficient to satisfy the FDA requirements of that phase.
In December 2022, with the passage of the Food and Drug Omnibus Reform Act, or FDORA, Congress required sponsors to develop and submit a diversity action plan for each Phase 3 clinical trial or any other “pivotal study” of a new drug or biological product. These plans are meant to encourage the enrollment of more diverse patient populations in late-stage clinical trials of FDA-regulated products. Specifically, action plans must include the sponsor’s goals for enrollment, the underlying rationale for those goals, and an explanation of how the sponsor intends to meet them. In addition to these requirements, the legislation directs the FDA to issue new guidance on diversity action plans.
In June 2023, the FDA issued draft guidance with updated recommendations for GCPs aimed at modernizing the design and conduct of clinical trials. The updates are intended to help pave the way for more efficient clinical trials to generate enough datafacilitate the development of medical products. The draft guidance is adopted from the International Council for Harmonisation’s recently updated E6(R3) draft guideline that was developed to statistically evaluateenable the efficacyincorporation of rapidly developing technological and safetymethodological innovations into the clinical trial enterprise. In addition, the FDA issued draft guidance outlining recommendations for the implementation of decentralized clinical trials.
In some cases, the FDA may approve an NDA for a product candidate but require the sponsor to conduct additional clinical trials to further assess the product for approval,candidate’s safety and effectiveness after approval. Such post-approval trials are typically referred to establishas Phase 4 clinical trials. These trials are used to gain additional experience from the overall risk‑benefit profiletreatment of a larger number of patients in the productintended treatment group and to provide adequate informationfurther document a clinical benefit in the case of drugs approved under accelerated approval regulations. Failure to exhibit due diligence with regard to conducting Phase 4 clinical trials could result in withdrawal of approval for the labeling of the product.
products.
Progress reports detailing the results of the clinical trials must be submitted at least annually to the FDA and more frequently if SAEsserious AEs occur. In addition, IND safety reports must be submitted to the FDA for any of the following: serious and unexpected suspected adverse reactions; findings from other studies or animal or in vitro testing that suggest a significant risk in humans exposed to the drug;product; and any clinically important increase in the case of a serious suspected adverse reaction over that listed in the protocol or investigator brochure. Phase 1, Phase 2 and Phase 3 clinical trials may not be completed successfully within any specified period, or at all. Furthermore, the FDA or the sponsor may suspend or terminate a clinical trial at any time on various grounds, including a finding that the research subjects are being exposed to an unacceptable health risk. Similarly, an IRB can suspend or terminate approval of a clinical trial at its institution, or an institution it represents, if the clinical trial is not being conducted in accordance with the IRB’s requirements or if the drug has been associated with unexpected serious harm to patients. The FDA will typically inspect one or more clinical sites to assure compliance with GCP and the integrity of the clinical data submitted.
ConcurrentInteractions with the FDA During the Clinical Development Program
Following the clearance of an IND and the commencement of clinical trials, companies often complete additional animal studiesa sponsor will continue to have interactions with the FDA and mustthe sponsor may meet with the FDA at certain points in the clinical development program. Specifically, sponsors may meet with the FDA prior to the submission of an IND, or a pre-IND meeting, at the end of Phase 2 clinical trial, or a EOP2 meeting, and before an NDA is submitted, or a pre-NDA meeting. Meetings at other times may also develop additionalbe requested. These meetings provide an opportunity for the sponsor to share information about the chemistrydata gathered to date with the FDA and physical characteristicsfor the FDA to provide advice on the next phase of development.
There are five types of meetings that occur between sponsors and the drugFDA. Type A meetings are those necessary for an otherwise stalled product development program to proceed or to address an important safety issue. Type B meetings include pre-IND and pre-NDA meetings as well as finalizeend of phase meetings, such as EOP2 meetings. A Type C meeting is any meeting other than a processType A or Type B meeting regarding the development and review of a product, including, for manufacturingexample, meetings to facilitate early consultations on the use of a biomarker as a new surrogate endpoint that has never been previously used as the primary basis for product approval in the proposed context of use. A Type D meeting is focused on a narrow set of issues (typically limited to no more than two focused topics) and should not require input from more than three disciplines or divisions. Finally, INitial Targeted Engagement for Regulatory Advice on CBER producTs, or INTERACT, meetings are intended for novel products and development programs that present unique challenges in the early development of an investigational product.
Such meetings may be conducted in person, via teleconference/videoconference, or written response only with minutes reflecting the questions that the sponsor posed to the FDA and the FDA’s responses. The FDA has indicated that its responses, as conveyed in meeting minutes and advice letters, only constitute mere recommendations and/or advice made to a sponsor and,
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as such, sponsors are not bound by such recommendations and/or advice. Nonetheless, from a practical perspective, a sponsor’s failure to follow the FDA’s recommendations for design of a clinical program may put the program at significant risk of failure. In September 2023, the FDA issued draft guidance outlining the terms of such meetings in more detail.
Review and Approval of an NDA
To obtain approval to market a drug product in commercial quantities in accordance with cGMP requirements. The manufacturing processthe United States, a marketing application must be capable of consistently producing quality batchessubmitted to the FDA that provides sufficient data establishing the safety and efficacy of the proposed drug candidate and, among other things,product for its intended indication. The application must develop methods for testing the identity, strength, quality, purity, and potency of the final drug. Additionally, appropriate packaging must be selected and tested and stability studies must be conducted to demonstrate that the drug candidate does not undergo unacceptable deterioration over its shelf life.
Submission of an NDA to the FDA
Assuming successful completion of required clinical testing and other requirements, the results of theinclude all relevant data available from pertinent preclinical studies and clinical trials, including negative or ambiguous results as well as positive findings, together with detailed information relating to the product’s chemistry, manufacture,manufacturing, controls and proposed labeling, among other things, arethings. Data can come from company-sponsored clinical trials intended to test the safety and effectiveness of a product use, or from alternative sources, including studies initiated by investigators. To support marketing approval, the data submitted must be sufficient in quality and quantity to establish the safety and efficacy of the drug product to the satisfaction of the FDA.
The NDA is a vehicle through which sponsors formally propose that the FDA as part of an NDA requesting approval to marketapprove a new product for marketing and sale in the drug productUnited States for one or more indications. Every new drug product candidate must be the subject of an approved NDA before it may be commercialized in the United States. Under federal law, the submission of most NDAs is subject to an application user fee, which for federal fiscal year 20182024 is $2,421,495 for an application requiring clinical data.approximately $4.05 million. The sponsor of an approved NDA is also subject to aan annual program fee, which for fiscal year 2018 of $304,162.2024 is $416,734 per product. Certain exceptions and waivers are available for some of these fees, such as an exception from the application fee for drugsproducts with orphan designation and a waiver for certain small businesses.
TheFollowing submission of an NDA, the FDA conducts a preliminary review of an NDAthe application generally within 60 calendar days of its receipt and strives tomust inform the sponsor by the 74th day after the FDA’s receipt of the submission to determineat that time or before whether the application is sufficiently complete to permit substantive review. The FDA may request additional information rather than accept an NDAthe application for filing. In this event, the application must be resubmitted with the additional information. The resubmitted application is also subject to review before

the FDA accepts it for filing. Once the submission is accepted for filing, the FDA begins an in‑depthin-depth substantive review. The FDA hasUnder the goals and policies agreed to certain performance goals inby the review processFDA under the PDUFA, applications seeking approval of NDAs. Most such applicationsNew Molecular Entities, or NMEs, are meant to be reviewed within ten months from the date of filing, and most applicationson which the FDA accepts the application for “priority review” products are meant to be reviewed within six months of filing. The review process and the PDUFA goal date may be extended by the FDA for three additional months to consider new information or clarification provided by the applicantsponsor to address an outstanding deficiency identified by the FDA following the original submission.
Before approving an NDA,application, the FDA typically will inspect the facility or facilities where the product is or will be manufactured. These pre‑approvalpre-approval inspections may cover all facilities associated with an NDA submission, including drug component manufacturing, (such as active pharmaceutical ingredients), finished drug product manufacturing and control testing laboratories. The FDA will not approve an application unless it determines that the manufacturing processes and facilities are in compliancecomply with cGMP requirements and are adequate to assure consistent production of the product within required specifications. Additionally, before approving an NDA,Under the FDA will typically inspect one or more clinical sites to assure compliance with GCP. TheReauthorization Act of 2017, the FDA must implement a protocol to expedite review of responses to inspection reports pertaining to certain drug applications, including applications for drugsproducts in a shortage or drugsthose for which approval is dependent on remediation of conditions identified in the inspection report.
In addition, as a condition of approval, the FDA may require an applicanta sponsor to develop a REMS. REMS use risk minimization strategies beyond the professional labeling to ensure that the benefits of the product outweigh the potential risks. REMS could include medication guides, communication plans for health care professionals, and elements to assure safe use, including special training or certification for prescribing or dispensing, dispensing only under certain circumstances, special monitoring and the use of patent registries. To determine whether a REMS is needed, the FDA will consider the size of the population likely to use the product, seriousness of the disease, expected benefit of the product, expected duration of treatment, seriousness of known or potential adverse events and whether the product is a new molecular entity. REMS can include medication guides, physician communication plans for healthcare professionals, and elements to assure safe use, or ETASU. ETASU may include, but are not limited to, special training or certification for prescribing or dispensing, dispensing only under certain circumstances, special monitoring, and the use of patient registries. The FDA may require a REMS before approval or post‑approval if it becomes aware of a serious risk associated with use of the product. The requirement for a REMS can materially affect the potential market and profitability of a product.an NME.
The FDA may refer an application for a novel drugproduct which presents difficult questions of safety or efficacy to an advisory committee or explain why such referral was not made. Typically, an advisory committee is a panel of independent experts, including clinicians and other scientific experts, that reviews, evaluates and provides a recommendation as to whether the application should be approved and under what conditions. The FDA is not bound by the recommendations of an advisory committee, but it considers such recommendations carefully when making decisions.
Fast Track, Breakthrough Therapy, priority reviewPriority Review and regenerative advanced therapy designationsRegenerative Advanced Therapy Designations
The FDA is authorized to designate certain products for expedited review if they are intended to address an unmet medical need in the treatment of a serious or life‑threateninglife-threatening disease or condition. These programs are referred to as fast trackcalled Fast Track designation, breakthrough therapyBreakthrough Therapy designation, priority review designation and regenerative advanced therapy designation.
Specifically, the
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Fast Track Designation. The FDA may designate a product for Fast Track review if it is intended, whethereither alone or in combination with one or more other products, for the treatment of a serious or life‑threateninglife-threatening disease or condition, and it demonstrates the potential to address unmet medical needs for such a disease or condition. For Fast Track products, sponsors may have greater interactions with the FDA and the FDA may initiate review of sections of a Fast Track product’s application before the application is complete. This rolling review process may be available if the FDA determines, after preliminary evaluation of clinical data submitted by the sponsor, that a Fast Track product may be effective. The sponsor must also provide, and the FDA must approve, a schedule for the submission of the remaining information and the sponsor must pay applicable user fees. However, the FDA’s time period goal for reviewing a Fast Track application does not begin until the last section of the application is submitted. In addition, the Fast Track designation may be withdrawn by the FDA if the FDA believes that the designation is no longer supported by data emerging in the clinical trial process.
Second, aBreakthrough Therapy Designation. A product may be designated as a Breakthrough Therapy if it is intended, either alone or in combination with one or more other products, to treat a serious or life‑threateninglife-threatening disease or condition and preliminary clinical evidence indicates that the product may demonstrate substantial improvement over existing therapies on one or more clinically significant endpoints, such as substantial treatment effects observed early in clinical development.endpoints. The FDA may take certain actions with respect to Breakthrough Therapies, includingincluding: holding meetings with the sponsor throughout the development process; providing timely advice to the product sponsor regarding development and approval; involving more senior staff in the review process; assigning a cross‑disciplinarycross-disciplinary project lead for the review team; and taking other steps to design the clinical trials in an efficient manner.
Third, thePriority Review. The FDA may designate a product for priority review if it is a product that treats a serious condition and, if approved, would provide a significant improvement in safety or effectiveness. The FDA determines, on a case-by-case basis, whether the proposed product represents a significant improvementeffectiveness when compared with other available therapies. Significant improvement may be illustrated by evidence of increased effectiveness in the treatment of a condition, elimination or substantial reduction of

a treatment‑limitingtreatment-limiting product reaction, documented enhancement of patient compliance that may lead to improvement in serious outcomes, and evidence of safety and effectiveness in a new subpopulation. A priority designation is intended to direct overall attention and resources to the evaluation of such applications, and to shorten the FDA’s goal for taking action onreview of a marketing application from ten months to six months.
Finally, with passage of the 21st Century Cures Act, or Cures Act, in December 2016, Congress authorized the FDA to accelerate review and approval of products designated as regenerative advanced therapies.Regenerative Advanced Therapy Designation. A product is eligible for thisregenerative advanced therapies designation if it is a regenerative medicine therapy (as defined in the Cures Act) that is intended to treat, modify, reverse or cure a serious or life‑threateninglife-threatening disease or condition, and preliminary clinical evidence indicates that the drugproduct has the potential to address unmet medical needs for such disease or condition. The benefits of a regenerative advanced therapy designation include early interactions with FDA to expedite development and review, benefits available to breakthrough therapies, potential eligibility for priority review and accelerated approval based on surrogate or intermediate endpoints.
Accelerated approval pathwayApproval Pathway
The FDA may grant accelerated approval to a drugDrug or biologic products studied for atheir safety and effectiveness in treating serious or life‑threatening conditionlife-threatening illnesses and that providesprovide meaningful therapeutic advantage to patientsbenefit over existing treatments based uponmay receive accelerated approval. Accelerated approval means that a determinationproduct candidate may be approved on the basis of adequate and well controlled clinical trials establishing that the drugproduct candidate has an effect on a surrogate endpoint that is reasonably likely to predict a clinical benefit. The FDA may also grant accelerated approval for such a condition whenbenefit, or on the product hasbasis of an effect on an intermediatea clinical endpoint that can be measured earlierother than an effect on irreversible morbiditysurvival or mortality, or IMM, and that is reasonably likely to predict an effect on irreversible morbidity or mortality or other clinical benefit, taking into account the severity, rarity orand prevalence of the condition and the availability or lack of alternative treatments. DrugsAs a condition of approval, the FDA may require that a sponsor of a drug or biologic product candidate receiving accelerated approval perform adequate and well controlled post-marketing clinical trials. In addition, the FDA currently requires as a condition for accelerated approval pre-approval of promotional materials.
With the passage of FDORA in December 2022, Congress modified certain provisions governing accelerated approval of drug and biologic products. Specifically, the new legislation authorized the FDA to: (i) require a sponsor to have its confirmatory clinical trial underway before accelerated approval is awarded, (ii) require a sponsor of a product granted accelerated approval must meetto submit progress reports on its post-approval studies to the same statutory standards for safetyFDA every six months (until the study is completed); and effectiveness as those granted traditional approval.
For the purposes of(iii) use expedited procedures to withdraw accelerated approval a surrogate endpoint is a marker, such as a laboratory measurement, radiographic image, physical signof an NDA or other measure that is thoughtbiologics license application after the confirmatory trial fails to predict clinical benefit, but is not itself a measure ofverify the product’s clinical benefit. Surrogate endpoints can often be measured more easily or more rapidly than clinical endpoints. An intermediate clinical endpoint is a measurement of a therapeutic effect that is considered reasonably likely to predict the clinical benefit of a drug, such as an effect on IMM. The FDA has limited experience with accelerated approvals based on intermediate clinical endpoints, but has indicated that such endpoints generally may support accelerated approval where the therapeutic effect measured by the endpoint is not itself a clinical benefit and basis for traditional approval, if there is a basis for concluding that the therapeutic effect is reasonably likely to predict the ultimate clinical benefit of a drug.
The accelerated approval pathway is most often used in settings in which the course of a disease is long and an extended period of time is required to measure the intended clinical benefit of a drug, even if the effect on the surrogate or intermediate clinical endpoint occurs rapidly. Thus, accelerated approval has been used extensively in the development and approval of drugs for treatment of a variety of cancers in which the goal of therapy is generally to improve survival or decrease morbidity and the duration of the typical disease courseFurther, FDORA requires lengthy and sometimes large trials to demonstrate a clinical or survival benefit.
The accelerated approval pathway is usually contingent on a sponsor’s agreement to conduct, in a diligent manner, additional post‑approval confirmatory studies to verify and describe the drug’s clinical benefit. As a result, a drug candidate approved on this basis is subject to rigorous post‑marketing compliance requirements, including the completion of Phase 4 or post‑approval clinical trials to confirm the effect on the clinical endpoint. Failure to conduct required post‑approval studies, or confirm a clinical benefit during post‑marketing studies, would allow the FDA to withdrawpublish on its website the drug fromrationale for why a post-approval study is not appropriate or necessary, whenever it decides not to require such a study upon granting accelerated approval. In March 2023, the market on an expedited basis. All promotional materials for drug candidates approved underFDA issued draft guidance that outlines its current thinking and approach to accelerated regulations are subject to prior review by the FDA.approval.
The FDA’s decisionDecision on an NDA
On the basis of the FDA’sBased on its evaluation of the NDAapplication and accompanying information, including the results of the inspection of the manufacturing facilities, the FDA may issue an approval letter or a complete response letter. An approval letter authorizes commercial marketing of the product with specific prescribing information for specificthe approved indications. A complete response letter generally indicates that the review cycle is complete and outlines the deficiencies in the submission, and may require substantial additional testing or information in order for the FDA to reconsider the application. If and when those deficiencies have been addressedA sponsor has one year to respond to the FDA’s satisfactiondeficiencies identified in a resubmission of the NDA, the FDA will issue an approvalcomplete response letter. The FDA has committed to reviewing such resubmissions
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in two or six months depending on the type of information included. Even with submission of this additional information, the FDA ultimately may decide that the application does not satisfy the regulatory criteria for approval.
If the FDA approves a new product, it may limit the approved indications for use forof the product,product. The FDA may also require that contraindications, warnings or precautions be included in the product labeling, require that post‑approval studies, including Phase 4 clinicalpost-approval trials, be conducted to further assess the drug’s safety after approval, require testing and surveillance programs to monitor the product after commercialization, or impose other conditions, including distribution and use restrictions or other risk management mechanisms, including REMS, which can materially affectto help ensure that the benefits of the product outweigh the potential market and profitability of the product.risks. The FDA may prevent or

limit further marketing of a product based on the results of post‑market studiespost-marketing trials or surveillance programs. After approval, many types of changes to the approved product, such as adding new indications, manufacturing changes and additional labeling claims, are subject to further testing requirements and FDA review and approval.
Post‑approval requirements
Drugs manufactured or distributed pursuant to FDA approvals are subject to pervasive and continuing regulation byUnder the Ensuring Innovation Act, signed into law in 2021, the FDA including,must publish action packages summarizing its decisions to approve new drugs within 30 days of approval of such drugs.
Post-Approval Regulation
If regulatory approval for marketing of a product or new indication for an existing product is obtained, the sponsor will be required to comply with all regular post-approval regulatory requirements as well as any post-approval requirements that the FDA may have imposed as part of the approval process. The sponsor will be required to report, among other things, certain adverse reactions and manufacturing problems to the FDA, provide updated safety and efficacy information and comply with requirements relating to recordkeeping, periodic reporting, product sampling and distribution,concerning advertising and promotionpromotional labeling requirements. Manufacturers and reportingcertain of adverse experiences with the product. After approval, most changes to the approved product, such as adding new indications or other labeling claims, are subject to prior FDA review and approval. There also are continuing, annual user fee requirements for any marketed products and the establishments at which such products are manufactured, as well as new application fees for supplemental applications with clinical data.
In addition, drug manufacturers and other entities involved in the manufacture and distribution of approved drugstheir subcontractors are required to register their establishments with the FDA and certain state agencies, and are subject to periodic unannounced inspections by the FDA and thesecertain state agencies for compliance with ongoing regulatory requirements, including cGMP requirements. Changes to the manufacturing process are strictly regulated and often require prior FDA approval before being implemented. FDA regulations also require investigation and correction of any deviations from cGMP and impose reporting and documentation requirements uponregulations. Accordingly, the sponsor and any third‑party manufacturers that the sponsor may decide to use. Accordingly,its third-party manufacturers must continue to expend time, money and effort in the areaareas of production and quality control to maintain compliance with cGMP compliance.and other regulatory requirements.
A product may also be subject to official lot release, meaning that the manufacturer is required to perform certain tests on each lot of the product before it is released for distribution. If the product is subject to official release, the manufacturer must submit samples of each lot, together with a release protocol showing a summary of the history of manufacture of the lot and the results of all the manufacturer’s tests performed on the lot, to the FDA. The FDA may in addition perform certain confirmatory tests on lots of some products before releasing the lots for distribution. Finally, the FDA will conduct laboratory research related to the safety, purity, potency and effectiveness of pharmaceutical products.
Once an approval is granted, the FDA may withdraw the approval if compliance with regulatory requirements and standards is not maintained or if problems occur after the product reaches the market. Later discovery of previously unknown problems with a product, including adverse events of unanticipated severity or frequency, or with manufacturing processes, or failure to comply with regulatory requirements, may result inin: revisions to the approved labeling to add new safety information; imposition of post‑marketpost-market studies or clinical trials to assess new safety risks; or imposition of distribution or other restrictions under a REMS program. Other potential consequences include, among other things:
restrictions on the marketing or manufacturing of the product, complete withdrawal of the product from the market or product recalls;
fines, warning letters or holds on post‑approvalpost-approval clinical trials;
refusal of the FDA to approve pending NDAsapplications or supplements to approved NDAs,applications, or suspension or revocation of product license approvals;
product seizure or detention, or refusal to permit the import or export of products; or
injunctions or the imposition of civil or criminal penalties.
The FDA strictly regulates the marketing, labeling, advertising and promotion of prescription drug products placed on the market. This regulation includes, among other things, standards and regulations for direct-to-consumer advertising, communications regarding unapproved uses, industry-sponsored scientific and educational activities, and promotional activities involving the Internet and social media. Promotional claims about a drug’s safety or effectiveness are prohibited before the drug is approved. After approval, a drug product generally may not be promoted for uses that are not approved by the FDA, as reflected in the product’s prescribing information, although it may be permissible, under very specific, narrow conditions, for a manufacturer to engage in nonpromotional, non-misleading communication regarding off-label information, such as distributing scientific or medical journal information. In the United States, healthcarehealth care professionals are generally permitted to prescribe drugs for such uses not described in the drug’s labeling, known as off-label uses, because the FDA does not regulate the practice of medicine. However, FDA regulations impose rigorous restrictions on manufacturers’ communications, prohibiting the promotion of off-label uses. It may
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In September 2021, the FDA published final regulations that describe the types of evidence that the agency will consider in determining the intended use of a drug or biologic. In addition, in October 2023, the FDA published draft guidance outlining the agency’s non-binding policies governing the distribution of scientific information on unapproved uses to healthcare providers. This draft guidance calls for such communications to be permissible, under very specific, narrow conditions,truthful, non-misleading, factual and unbiased and include all information necessary for a manufacturerhealthcare providers to engage in nonpromotional, non-misleading communications regarding off-labelinterpret the strengths and weaknesses and validity and utility of the information such as distributing scientific or medical journal information. about the unapproved use.
If a company is found to have promoted off-label uses, it may become subject to adverse public relations and administrative and judicial enforcement by the FDA, the Department of Justice, or the DOJ, or the Office of the Inspector General of the Department of Health and Human Services, as well as state authorities. This could subject a company to a range of penalties that could have a significant commercial impact, including civil and criminal fines, and agreements that materially restrict the manner in which a company promotes or distributes drug products. The federal government has levied large civil and criminal fines against companies for alleged improper promotion, and has also requested that companies enter into consent decrees or permanent injunctions under which specified promotional conduct is changed or curtailed.
In addition, the distribution of prescription pharmaceutical products is subject to the Prescription Drug Marketing Act, or PDMA, and its implementationimplementing regulations, as well as the Drug Supply Chain Security Act, or DSCSA, which regulatesregulate the distribution of and tracing of prescription drugs and prescription drug samples at the federal level, and setsset minimum standards for the regulation of drug distributors by the states. The PDMA, its implementing regulations and state laws limit the distribution of prescription pharmaceutical product samples, and the DSCSA imposes requirements to ensure accountability in distribution and to identify and remove counterfeit and other illegitimate products from the market.

Section 505(b)(2) NDAs
NDAs for most new drug products are based on two full clinical studiestrials which must contain substantial evidence of the safety and efficacy of the proposed new product.product for the proposed use. These applications are submitted under Section 505(b)(1) of the FDCA. The FDA is, however, authorized to approve an alternative type of NDA under Section 505(b)(2) of the FDCA. This type of application allows the applicant to rely, in part, on the FDA’s previous findings of safety and efficacy for a similar product, or published literature. Specifically, Section 505(b)(2) applies to NDAs for a drug for which the investigations made to show whether or not the drug is safe for use and effective in use and relied upon by the applicantsponsor for approval of the application “were not conducted by or for the applicantsponsor and for which the applicantsponsor has not obtained a right of reference or use from the person by or for whom the investigations were conducted.”
Thus, Section 505(b)(2) authorizes the FDA to approve an NDA based on safety and effectiveness data that were not developed by the applicant.sponsor. NDAs filed under Section 505(b)(2) may provide an alternate and potentially more expeditious pathway to FDA approval for new or improved formulations or new uses of previously approved products. If the Section 505(b)(2) applicantsponsor can establish that reliance on the FDA’s previous approval is scientifically appropriate, the applicantsponsor may eliminate the need to conduct certain preclinical or clinical studies of the new product. The FDA may also require companies to perform additional studies or measurements to support the change from the approved product. The FDA may then approve the new drug candidate for all or some of the label indications for which the referenced product has been approved, as well as for any new indication sought by the Section 505(b)(2) applicant.sponsor.
Abbreviated new drug applications for generic drugsGeneric Drugs and Regulatory Exclusivity
In 1984, with passage of the Hatch‑WaxmanHatch-Waxman Amendments to the FDCA, Congress authorizedestablished an abbreviated regulatory scheme authorizing the FDA to approve generic drugs that are shown to contain the same active ingredients as, and to be bioequivalent to, drugs previously approved by the FDA underpursuant to NDAs. Such previously approved drugs are known as the NDA provisions of the statute. To obtain approval of a generic drug, an applicant must submit an abbreviatedreference listed drugs, or RLDs. Abbreviated new drug application,applications, or ANDA,ANDAs, for generic drugs generally do not include preclinical and clinical data to demonstrate safety and effectiveness. Instead, the agency. In support of such applications, a generic manufacturersponsor may rely on the preclinical and clinical testing previously conducted for a drug product previously approved under an NDA, known as the reference‑listed drug, or RLD.
Specifically, in order for an ANDA to be approved, the FDA must find that the generic version is identical to the RLD with respect to the active ingredients, the route of administration, the dosage form, and the strength of the drug. At the same time, the FDA must also determine that the generic drug is “bioequivalent” to the innovator drug. Under the statute, a generic drug is bioequivalent to a RLD if “the rate and extent of absorption of the drug do not show a significant difference from the rate and extent of absorption of the listed drug...”
Upon approval of an ANDA, the FDA indicates whether the generic product is “therapeutically equivalent” to the RLD in its publication Approved Drug Products with Therapeutic Equivalence Evaluations, also referred to as the Orange Book. Clinicians and pharmacists consider a therapeutic equivalent generic drug to be fully substitutable for the RLD. In addition, by operation of certain state laws and numerous health insurance programs, the FDA’s designation of therapeutic equivalence often results in substitution of the generic drug without the knowledge or consent of either the prescribing clinicians or patient.
Under the Hatch‑Waxman Amendments,Hatch-Waxman Act, the FDA may not approve an ANDA or 505(b)(2) application until any applicable period of non‑patentnon-patent exclusivity for the RLD has expired. The FDCA provides a period of five years of non‑patentnon-patent data exclusivity for a new drug containing a new chemical entity.entity, or NCE. For the purposes of this provision, a new chemical entity, oran NCE is a drug that contains no active moiety that has previously been approved by the FDA in any other NDA. An active moiety is the molecule or ion responsible for the physiological or pharmacological action of the drug substance. In cases where such NCE exclusivity has been granted, an ANDAa generic or follow-on drug application may not be filed with the FDA until the expiration of five years unless the submission is accompanied by a Paragraph IV certification, in which case the applicantsponsor may submit its application four years following the original product approval.
The FDCA also provides for a period of three years of exclusivity if the NDA includes reports of one or more new clinical investigations, other than bioavailability or bioequivalence studies, that were conducted by or for the applicantsponsor and are essential to the approval of the application. This three‑yearthree-year exclusivity period often protects changes to a previously approved drug
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product, such as a new indications, dosage form,forms, route of administration, combination or indication. Three‑yearof ingredients. Three-year exclusivity would be available for a drug product that contains a previously approved active moiety, provided the statutory requirement for a new clinical investigation is satisfied. Unlike five‑yearfive-year NCE exclusivity, an award of three‑yearthree-year exclusivity does not block the FDA from accepting ANDAs or 505(b)(2) NDAs seeking approval for generic versions of the drug as of the date of approval of the original drug product. The FDA typically makes decisions about awardsproduct; rather, this three-year exclusivity covers only the conditions of data exclusivity shortly beforeuse associated with the new clinical investigations and, as a product is approved.
The FDA must establish a priority review track for certain generic drugs, requiringgeneral matter, does not prohibit the FDA to review a drug application within eight (8) monthsfrom approving follow-on applications for a drug that has three (3) or fewer approved drugs listed incontaining the Orange Book and is no longer protected by any patent or regulatory exclusivities, or is on the FDA’s drug shortage list. The new legislation also authorizes the FDA to expedite review of ‘‘competitor generic therapies’’ or drugs with inadequate generic competition, including holding meetings with or providing advice to the drug sponsor prior to submission of the application.

Hatch‑Waxman patent certification and the 30‑month stayoriginal active ingredient.
Upon approvalsubmission of an NDA or a supplement thereto, NDA sponsors are required to list with the FDA each patent with claims that cover the applicant’ssponsor’s product or an approved method of using the product. EachUpon approval of a new drug, each of the patents listed by the NDA sponsor is published in the FDA's publication "Approved Drug Products with Therapeutic Equivalence Evaluations," also referred to as the Orange Book. When an ANDA applicantsponsor files its application with the FDA, the applicant is required to certify to the FDA concerning any patents listed for the reference product in the Orange Book, except for patents covering methods of use for whichBook. Specifically, the ANDA applicantsponsor must certify: (i) the required patent information has not been filed, (ii) the listed patent has expired, (iii) the listed patent has not expired, but will expire on a particular date and approval is sought after patent expiration or (iv) the listed patent is invalid, unenforceable or will not seeking approval.be infringed by the new product. To the extent that the Section 505(b)(2) applicantsponsor is relying on studies conducted for an already approved product, the applicantsponsor is required to certify to the FDA concerning any patents listed for the approved product in the Orange Book to the same extent that an ANDA applicantsponsor would.
Specifically, the applicant must certify with respect to each patent that:
the required patent information has not been filed;
the listed patent has expired;
the listed patent has not expired, but will expire on a particular date and approval is sought after patent expiration; or
the listed patent is invalid, unenforceable or will not be infringed by the new product.
A certification that the new product will not infringe the already approved product’s listed patents or that such patents are invalid or unenforceable is called a Paragraph IV certification. If the applicantsponsor does not challenge the listed patents, or indicates that it is not seeking approval of a patented method of use, the ANDA applicationor 505(b)(2) NDA will not be approved until all the listed patents claiming the referenced product have expired (other than method of use patents involving indications for which the ANDA applicant is not seeking approval).expired.
If the ANDA applicantsponsor or the 505(b)(2) sponsor has provided a Paragraph IV certification to the FDA, the applicantsponsor must also send notice of the Paragraph IV certification to the NDA owner and patent holders once the ANDA or 505(b)(2) NDA has been accepted for filing by the FDA. The NDA owner and patent holders may then initiate a patent infringement lawsuit in response to the notice of the Paragraph IV certification. The filing of a patent infringement lawsuit within 45 days after the receipt of a Paragraph IV certification automatically prevents the FDA from approving the ANDA or 505(b)(2) NDA until the earlier of 30 months after the receipt of the Paragraph IV notice, expiration of the patent, or a decision in the infringement case that is favorable to the ANDA applicant.
To the extent that the Sectionor 505(b)(2) applicant is relying on studies conducted for an already approved product, the applicant is required to certify to the FDA concerning any patents listed for the approved product in the Orange Book to the same extent that an ANDA applicant would. As a result, approval of a Section 505(b)(2) NDA can be stalled until all the listed patents claiming the referenced product have expired, until any non‑patent exclusivity, such as exclusivity for obtaining approval of a new chemical entity, listed in the Orange Book for the referenced product has expired, and, in the case of a Paragraph IV certification and subsequent patent infringement suit, until the earlier of 30 months, settlement of the lawsuit or a decision in the infringement case that is favorable to the Section 505(b)(2) applicant.sponsor.
Pediatric studies and exclusivityStudies
Under the Pediatric Research Equity Act of 2003, or PREA, an NDA or supplement thereto must contain data that are adequate to assess the safety and effectiveness of the drug product for the claimed indications in all relevant pediatric subpopulations, and to support dosing and administration for each pediatric subpopulation for which the product is safe and effective. With enactment of the Food and Drug Administration Safety and Innovation Act or FDASIA, in 2012, sponsorsSponsors must also submit pediatric study plans prior to the assessment data. Those plans must contain an outline of the proposed pediatric study or studies the applicantsponsor plans to conduct, including study objectives and design, any deferral or waiver requests and other information required by regulation. The applicant,sponsor, the FDA, and the FDA’s internal review committee must then review the information submitted, consult with each other and agree upon a final plan. The FDA or the applicantsponsor may request an amendment to the plan at any time.
For drugs intended to treat a serious or life-threatening disease or condition, the FDA must, upon the request of an applicant,a sponsor, meet to discuss preparation of the initial pediatric study plan or to discuss deferral or waiver of pediatric assessments. In addition, the FDA will meet early in the development process to discuss pediatric study plans with drug sponsors. The legislation requiressponsors, and the FDA tomust meet with drug sponsors by no later than the end-of-phase 1 meeting for serious or life-threatening diseases and by no later than ninety (90) days after the FDA’s receipt of the study plan.
The FDA may, on its own initiative or at the request of the applicant,sponsor, grant deferrals for submission of some or all pediatric data until after approval of the product for use in adults, or full or partial waivers from the pediatric data requirements. Additional requirements and procedures relatingA deferral may be granted for several reasons, including a finding that the product or therapeutic candidate is ready for approval for use in adults before pediatric trials are complete or that additional safety or effectiveness data needs to be collected before the pediatric trials begin. The law requires the FDA to send a PREA Non-Compliance letter to sponsors who have failed to submit their pediatric assessments required under PREA, have failed to seek or obtain a deferral requests and requestsor deferral extension or have failed to request approval for extension of deferrals are contained in FDASIA.a required pediatric formulation. Unless otherwise required by regulation, the pediatric data requirements do not apply to products with orphan designation.designation, although the FDA has recently taken steps to limit what it considers abuse of this statutory exemption in PREA by announcing that it does not intend to grant any additional orphan drug designations for rare pediatric subpopulations of what is otherwise a common disease. The FDA maintains a list of diseases that are exempt from the requirements of the PREA. In May 2023, the FDA issued new draft guidance that further describes the pediatric study requirements under PREA.
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Pediatric Exclusivity
Pediatric exclusivity is another type of non‑patentnon-patent marketing exclusivity in the United States and, if granted, provides for the attachment of an additional six months of marketing protection to the term of any existing patent or regulatory exclusivity including the

non‑patent and orphan exclusivity.for drug products. This six‑monthsix-month exclusivity may be granted if an NDA sponsor submits pediatric data that fairly respond to a written request from the FDA for such data. The data do not need to show the product to be effective in the pediatric population studied; rather, if the clinical trial is deemed to fairly respond to the FDA’s request, the additional protection is granted. If reports of requested pediatric studies are submitted to and accepted by the FDA within the statutory time limits, whatever statutory or regulatory periods of exclusivity or patent protection cover the product are extended by six months. This is not a patent term extension, but it effectively extends the regulatory period during which the FDA cannot approve another application. With regard to patents, the six-month pediatric exclusivity period will not attach to any patents for which a generic (ANDA or 505(b)(2) NDA) applicantsponsor submitted a paragraphParagraph IV patent certification, unless the NDA sponsor or patent owner first obtains a court determination that the patent is valid and infringed by a proposed generic product.
Orphan drug designationDrug Designation and exclusivityExclusivity
Under the Orphan Drug Act, the FDA may designate a drug product as an “orphan drug” if it is intended to treat a rare disease or condition, (generallygenerally meaning that it affects fewer than 200,000 individuals in the United States, or more in cases in which there is no reasonable expectation that the cost of developing and making a drug product available in the United States for treatment of the disease or condition will be recovered from sales of the product).product. A company must requestseek orphan productdrug designation before submitting an NDA.NDA for the candidate product. If the request is granted, the FDA will disclose the identity of the therapeutic agent and its potential use. Orphan productdrug designation does not convey any advantage in or shorten the duration ofPDUFA goal dates for the regulatory review and approval process.process, although it does convey certain advantages such as tax benefits and exemption from the PDUFA application fee.
If a product with orphan statusdesignation receives the first FDA approval for the disease or condition for which it has such designation, or for a select indication or use within the rare disease or condition for which it was designated, the product generally will be receivingreceive orphan productdrug exclusivity. Orphan productdrug exclusivity means that the FDA may not approve any other applicationsanother sponsor’s marketing application for the same productdrug for the same indicationcondition for seven years, except in certain limited circumstances. Competitors may receiveOrphan exclusivity does not block the approval of a different products for the indication for which the orphan product has exclusivity and may obtain approval for the same rare disease or condition, nor does it block the approval of the same product but for a different indication.conditions. If a drug or drug product designated as an orphan productdrug ultimately receives marketing approval for an indication broader than what was designated in its orphan productdrug application, it may not be entitled to exclusivity.
Orphan drug exclusivity will also not bar approval of another orphan drugproduct under certain circumstances, including if a subsequent product with the same drug for the same indicationcondition is shown to be clinically superior to the approved product on the basis of greater efficacy or safety, or providing a major contribution to patient care, or if the company with orphan drug exclusivity is not able to meet market demand. The new legislation reverses prior precedentThis is the case despite an earlier court opinion holding that the Orphan Drug Act unambiguously required the FDA to recognize orphan exclusivity regardless of a showing of clinical superiority.
In September 2021, the Court of Appeals for the 11th Circuit held that, for the purpose of determining the scope of market exclusivity, the term “same disease or condition” in the statute means the designated “rare disease or condition” and could not be interpreted by the FDA to mean the “indication or use.” Thus, the court concluded that orphan drug exclusivity applies to the entire designated disease or condition rather than the “indication or use.” Although there have been legislative proposals to overrule this decision, they have not been enacted into law. In January 2023, the FDA announced that, in matters beyond the scope of that court’s order, the FDA will continue to apply its existing regulations tying orphan-drug exclusivity to the uses or indications for which the orphan drug was approved.
Patent term restorationTerm Restoration and extensionExtension
A patent claiming a new drug product, its method of use or its method of manufacture may be eligible for a limited patent term extension under the Hatch‑WaxmanHatch-Waxman Act, which permits a patent restoration of up to five years for patent term lost during product development and the FDA regulatory review. The restoration period granted on a patent covering a product is typically one‑halfone-half the time between the effective date of an INDwhen a clinical investigation involving human beings has begun and the submission date of an NDA,application for approval, plus the time between the submission date of an NDAapplication and the ultimate approval date. Patent term restoration cannot be used to extend the remaining patent term of a patent past a total of 14 years from the product’s approval date. Only one patent applicable to an approved drug product is eligible for the extension, and the application for the extension must be submitted prior to the expiration of the patent in question. A patent that covers multiple drugsproducts for which approval is sought can only be extended in connection with one of the approvals. The USPTO reviews and approves the application for any patent term extension or restoration in consultation with the FDA. We cannot provide
Health Care Law and Regulation
Health care providers and third-party payors play a primary role in the recommendation and prescription of drug products that are granted marketing approval. Arrangements with providers, consultants, third-party payors and customers are subject to
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broadly applicable fraud and abuse, anti-kickback, false claims laws, patient privacy laws and regulations and other health care laws and regulations that may constrain business and/or financial arrangements. Restrictions under applicable federal and state health care laws and regulations, include the following:
the federal Anti-Kickback Statute, which prohibits, among other things, persons and entities from knowingly and willfully soliciting, offering, paying, receiving or providing remuneration, directly or indirectly, in cash or in kind, to induce or reward either the referral of an individual for, or the purchase, order or recommendation of, any assurancegood or service, for which payment may be made, in whole or in part, under a federal health care program such as Medicare and Medicaid;
the federal civil and criminal false claims laws, including the civil False Claims Act, and civil monetary penalties laws, which prohibit individuals or entities from, among other things, knowingly presenting, or causing to be presented, to the federal government, claims for payment that are false, fictitious or fraudulent or knowingly making, using or causing to made or used a false record or statement to avoid, decrease or conceal an obligation to pay money to the federal government;
the federal Health Insurance Portability and Accountability Act of 1996, or HIPAA, which created additional federal criminal laws that prohibit, among other things, knowingly and willfully executing, or attempting to execute, a scheme to defraud any patent term extensionhealth care benefit program or making false statements relating to health care matters;
HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act, and their respective implementing regulations, including the Final Omnibus Rule published in January 2013, which impose obligations, including mandatory contractual terms, with respect to safeguarding the privacy, security and transmission of individually identifiable health information;
the federal false statements statute, which prohibits knowingly and willfully falsifying, concealing or covering up a material fact or making any U.S. patent will be obtained and, if obtained, the duration of such extension,materially false statement in connection with the delivery of or payment for health care benefits, items or services;
the Foreign Corrupt Practices Act, or FCPA, which prohibits companies and their intermediaries from making, or offering or promising to make improper payments to non-U.S. officials for the purpose of obtaining or retaining business or otherwise seeking favorable treatment;
the federal transparency requirements known as the federal Physician Payments Sunshine Act, under the Patient Protection and Affordable Care Act, as amended by the Health Care Education Reconciliation Act, or the ACA, which requires certain manufacturers of drugs, devices, biologics and medical supplies to report annually to the Centers for Medicare & Medicaid Services, or CMS, within the United States Department of Health and Human Services, or HHS, information related to payments and other transfers of value made by that entity to physicians, other healthcare providers and teaching hospitals, as well as ownership and investment interests held by physicians and their immediate family members; and
analogous state and foreign laws and regulations, such as state anti-kickback and false claims laws, which may apply to health care items or services that are reimbursed by non-government third-party payors, including private insurers.
Further, some state laws require pharmaceutical companies to comply with the pharmaceutical industry’s voluntary compliance guidelines and the relevant compliance guidance promulgated by the federal government in addition to requiring manufacturers to report information related to payments to physicians and other health care providers or marketing expenditures. Additionally, some state and local laws require the registration of pharmaceutical sales representatives in the jurisdiction. State and foreign laws also govern the privacy and security of health information in some circumstances, many of which differ from each other in significant ways and often are not preempted by HIPAA, thus complicating compliance efforts.
Violations of these laws are punishable by criminal and/or civil sanctions, including, in some instances, exclusion from participation in federal and state health care programs, such as Medicare and Medicaid.
Pharmaceutical Insurance Coverage and Health Care Reform
In the United States and other countries, patients who are prescribed treatments for their conditions and providers performing the prescribed services generally rely on third-party payors to reimburse all or part of the associated health care costs. Significant uncertainty exists as to the coverage and reimbursement status of products approved by the FDA and other government authorities. Thus, even if a product candidate is approved, sales of the product will depend, in part, on the extent to which third-party payors, including government health programs in the United States such as Medicare and Medicaid, commercial health insurers and managed care organizations, provide coverage and establish adequate reimbursement levels for the product. The process for determining whether a payor will provide coverage for a product may be separate from the process for setting the price or reimbursement rate that the payor will pay for the product once coverage is approved. Third-party payors are increasingly challenging the prices charged, examining the medical necessity and reviewing the cost-effectiveness of medical products and services and imposing controls to manage costs. Third-party payors may limit coverage to specific
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products on an approved list, also known as a formulary, which might not include all the approved products for a particular indication.
In order to secure coverage and reimbursement for any product that might be approved for sale, a company may need to conduct expensive pharmacoeconomic studies to demonstrate the medical necessity and cost-effectiveness of ourthe product, candidates.in addition to the costs required to obtain FDA or other comparable marketing approvals. Nonetheless, product candidates may not be considered medically necessary or cost effective. A decision by a third-party payor not to cover a product could reduce physician utilization once the product is approved and have a material adverse effect on sales, results of operations and financial condition. Additionally, a payor’s decision to provide coverage for a product does not imply that an adequate reimbursement rate will be approved. Further, one payor’s determination to provide coverage for a product does not assure that other payors will also provide coverage and reimbursement for the product, and the level of coverage and reimbursement can differ significantly from payor to payor.
The 21st Century Curescontainment of health care costs also has become a priority of federal, state and foreign governments, and the prices of products have been a focus in this effort. Governments have shown significant interest in implementing cost-containment programs, including price controls, restrictions on reimbursement and requirements for substitution of generic products. Adoption of price controls and cost-containment measures, and adoption of more restrictive policies in jurisdictions with existing controls and measures, could further limit a company’s revenue generated from the sale of any approved products. Coverage policies and third-party reimbursement rates may change at any time. Even if favorable coverage and reimbursement status is attained for one or more products for which a company or its collaborators receive marketing approval, less favorable coverage policies and reimbursement rates may be implemented in the future.
There have been several federal and state proposals during the last few years regarding the pricing of pharmaceutical and biopharmaceutical products, limiting coverage and reimbursement for drugs, biologics and other medical products, government control and other changes to the health care system in the United States.
In March 2010, the United States Congress enacted the ACA, which, among other things, includes changes to the coverage and payment for drug products under government health care programs. Among the provisions of the ACA of importance to our potential product candidates are:
an annual, nondeductible fee on any entity that manufactures or imports specified branded prescription drugs and biologic agents, apportioned among these entities according to their market share in certain government healthcare programs;
expansion of eligibility criteria for Medicaid programs by, among other things, allowing states to offer Medicaid coverage to certain individuals with income at or below 133% of the federal poverty level, thereby potentially increasing a manufacturer’s Medicaid rebate liability;
expanded manufacturers’ rebate liability under the Medicaid Drug Rebate Program, or MDRP, by increasing the minimum rebate for both branded and generic drugs, and revising the definition of “average manufacturer price,” or AMP, for calculating and reporting Medicaid drug rebates on outpatient prescription drug prices;
addressed a new methodology by which rebates owed by manufacturers under the MDRP are calculated for drugs that are inhaled, infused, instilled, implanted or injected;
expanded the types of entities eligible for the 340B drug discount program;
established the Medicare Part D coverage gap discount program by requiring manufacturers to provide a 50% (and 70% starting January 1, 2019) point-of-sale-discount off the negotiated price of applicable brand drugs to eligible beneficiaries during their coverage gap period as a condition for the manufacturers’ outpatient drugs to be covered under Medicare Part D; and
a new Patient-Centered Outcomes Research Institute to oversee, identify priorities in, and conduct comparative clinical effectiveness research, along with funding for such research.
Other legislative changes have been proposed and adopted in the United States since the ACA was enacted. In August 2011, the Budget Control Act of 2011, among other things, created measures for spending reductions by Congress. A Joint Select Committee on Deficit Reduction, tasked with recommending a targeted deficit reduction of at least $1.2 trillion for the years 2013 through 2021, was unable to reach required goals, thereby triggering the legislation’s automatic reduction to several government programs. This includes aggregate reductions of Medicare payments to providers up to 2% per fiscal year, which will now remain in effect for six months into 2032.
The Consolidated Appropriations Act, which was signed into law by President Biden in December 2022, made several changes to sequestration of the Medicare program. Section 1001 of the Consolidated Appropriations Act delays the 4% Statutory Pay-As-You-Go Act of 2010, or PAYGO, sequester for two years, through the end of 2024. Triggered by enactment of the American Rescue Plan Act of 2021, the 4% cut to the Medicare program would have taken effect in January 2023. The
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Consolidated Appropriations Act’s health care offset title includes Section 4163, which extends the 2% Budget Control Act of 2011 Medicare sequester for six months into 2032 and lowers the payment reduction percentages in years 2030 and 2031.
Since enactment of the ACA, there have been, and continue to be, numerous legal challenges and Congressional actions to repeal and replace provisions of the law. For example, with enactment of the Tax Cuts and Jobs Act of 2017 on December 22, 2017, Congress repealed the “individual mandate.” The repeal of this provision, which requires most Americans to carry a minimal level of health insurance, became effective in 2019. On November 10, 2020, the Supreme Court heard oral arguments as to whether the individual mandate portion of the ACA is an essential and inseverable feature of the ACA, and therefore because the mandate was repealed as part of the Tax Cuts and Jobs Act of 2017, the remaining provisions of the ACA are invalid as well. On June 17, 2021, the Supreme Court dismissed this action after finding that the plaintiffs did not have standing to challenge the ACA’s minimum essential coverage provision at issue in the case. Litigation and legislation over the ACA are likely to continue, with unpredictable and uncertain results.
The Trump Administration also took executive actions to undermine or delay implementation of the ACA, including directing federal agencies with authorities and responsibilities under the ACA to waive, defer, grant exemptions from, or delay the implementation of any provision of the ACA that would impose a fiscal or regulatory burden on states, individuals, healthcare providers, health insurers, or manufacturers of pharmaceuticals or medical devices. On January 28, 2021, however, President Biden rescinded those orders and issued a new executive order which directs federal agencies to reconsider rules and other policies that limit Americans’ access to health care, and consider actions that will protect and strengthen that access. Under this executive order, federal agencies are directed to re-examine: policies that undermine protections for people with pre-existing conditions, including complications related to COVID-19; demonstrations and waivers under Medicaid and the ACA that may reduce coverage or undermine the programs, including work requirements; policies that undermine the Health Insurance Marketplace or other markets for health insurance; policies that make it more difficult to enroll in Medicaid and under the ACA; and policies that reduce affordability of coverage or financial assistance, including for dependents.
Pharmaceutical Prices
The costs of prescription pharmaceuticals have also been the subject of considerable discussion in the United States. To date, there have been several recent U.S. congressional inquiries, as well as proposed and enacted state and federal legislation designed to, among other things, bring more transparency to drug pricing, review the relationship between pricing and manufacturer patient programs, and reduce the costs of drugs under Medicare and Medicaid. To those ends, the Trump Administration issued several executive orders intended to lower the costs of prescription drug products. Certain of these orders are reflected in recently promulgated regulations, including an interim final rule implementing a most favored nation model for prices that would tie Medicare Part B payments for certain physician-administered pharmaceuticals to the lowest price paid in other economically advanced countries, effective January 1, 2021, but such rule has been subject to a nationwide preliminary injunction. In December 13, 2016, President Obama signed2021, the Cures ActCMS issued a final rule to rescind it. With issuance of this rule, CMS stated that it will explore all options to incorporate value into payments for Medicare Part B pharmaceuticals and improve beneficiaries' access to evidence-based care.
In addition, the HHS and the FDA published a final rule allowing states and other entities to develop a Section 804 Importation Program to import certain prescription drugs from Canada into the United States. That regulation was challenged in a lawsuit by the Pharmaceutical Research and Manufacturers of America, or PhRMA, but the case was dismissed by a federal district court in February 2023 after the court found that PhRMA did not have standing to sue HHS.Nine states (Colorado, Florida, Maine, New Hampshire, New Mexico, North Dakota, Texas, Vermont and Wisconsin) have passed laws allowing for the importation of drugs from Canada.Certain of these states have submitted Section 804 Importation Program proposals and are awaiting FDA approval.On January 5, 2024, the FDA approved Florida’s plan for Canadian drug importation.
Further, the HHS finalized a regulation removing safe harbor protection for price reductions from pharmaceutical manufacturers to plan sponsors under Part D, either directly or through pharmacy benefit managers, unless the price reduction is required by law. The Curesfinal rule would also eliminate the current safe harbor for Medicare drug rebates and create new safe harbors for beneficiary point-of-sale discounts and pharmacy benefit manager service fees. It originally was set to go into effect on January 1, 2022, but with passage of the Inflation Reduction Act of 2022, or IRA, has been delayed by Congress to January 1, 2032.
The IRA has implications for Medicare Part D, which is designeda program available to modernizeindividuals who are entitled to Medicare Part A or enrolled in Medicare Part B to give them the option of paying a monthly premium for outpatient prescription drug coverage. Among other things, the IRA requires manufacturers of certain drugs to engage in price negotiations with Medicare (beginning in 2026), with prices that can be negotiated subject to a cap; imposes rebates under Medicare Part B and personalize healthcare, spur innovationMedicare Part D to penalize price increases that outpace inflation (first due in 2023); and research, and streamlinereplaces the discovery and developmentPart D coverage gap discount program with a new discounting program (beginning in 2025).The IRA permits the Secretary of new therapiesthe HHS to implement many of these provisions through increased federal funding of particular programs. It authorizes increased fundingguidance, as opposed to regulation, for the FDAinitial years.
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Specifically, with respect to spend on innovation projects.price negotiations, Congress authorized Medicare to negotiate lower prices for certain costly single-source drug and biologic products that do not have competing generics or biosimilars and are reimbursed under Medicare Part B and Part D.CMS may negotiate prices for ten high-cost drugs paid for by Medicare Part D starting in 2026, followed by 15 Medicare Part D drugs in 2027, 15 Medicare Part B or Part D drugs in 2028, and 20 Medicare Part B or Part D drugs in 2029 and beyond.This provision applies to drug products that have been approved for at least 9 years and biologics that have been licensed for 13 years, but it does not apply to drugs and biologics that have been approved for a single rare disease or condition.Further, the legislation subjects drug manufacturers to civil monetary penalties and a potential excise tax for failing to comply with the legislation by offering a price that is not equal to or less than the negotiated “maximum fair price” under the law or for taking price increases that exceed inflation. The legislation also requires manufacturers to pay rebates for drugs in Medicare Part D whose price increases exceed inflation. The new law also amends the Public Health Service Actcaps Medicare out-of-pocket drug costs at an estimated $4,000 a year in 2024 and, thereafter beginning in 2025, at $2,000 a year.
The IRA includes a provision exempting orphan drugs from Medicare price negotiation but this exclusion has been interpreted by CMS in final guidance issued in July 2023 to reauthorize and expand fundingapply only to those orphan drugs with an approved indication (or indications) for a single rare disease or condition. The final guidance clarifies that CMS will consider only active designations/approvals when evaluating a drug for the NIH. The Act establishesexclusion, such that designations/indications withdrawn before the NIH Innovation Fund to pay for the cost of development and implementation of a strategic plan, early stage investigators and research. Itselected drug publication date will not be considered. CMS also charges the NIH with leading and coordinating expanded pediatric research. Further, the Cures Act directs the Centers for Disease Control and Prevention to expand surveillance of neurological diseases.
With amendments to the FDCA and the Public Health Service Act, or PHSA, Title III of the Cures Act seeks to accelerate the discovery, development, and delivery of new medicines and medical technologies. Toclarified that, end, and among other provisions, the Cures Act reauthorizes the existing priority review voucher program for certain drugs intended to treat rare pediatric diseases until 2020; creates a new priority review voucher program for drug applications determined to be material national security

threat medical countermeasure applications; revises the FDCA to streamline review of combination product applications; requires the FDA to evaluate the potential use of “real world evidence” to help support approval of new indications for approved drugs; provides a new “limited population” approval pathway for antibiotic and antifungal drugs intended to treat serious or life‑threatening infections; and authorizes the FDA to designateif a drug asloses its orphan drug exclusion status, the agency will use the earliest date of approval/licensure to determine whether the product is a “regenerative advanced therapy,” thereby making it eligible for certain expedited reviewqualifying single source drug subject to price negotiations.
In June 2023, Merck filed a lawsuit against HHS and approval designations.
FDA approval and regulation of companion diagnostics
If safe and effective use of a therapeutic depends on an in vitro diagnostic, then the FDA generally will require approval or clearance ofCMS asserting that, diagnostic, known as a companion diagnostic, at the same time that the FDA approves the therapeutic product. In August 2014, the FDA issued final guidance clarifying the requirements that will apply to approval of therapeutic products and in vitro companion diagnostics. According to the guidance, for novel drugs, a companion diagnostic device and its corresponding therapeutic should be approved or cleared contemporaneously by the FDA for the use indicated in the therapeutic product’s labeling.
If FDA determines that a companion diagnostic device is essential to the safe and effective use of a novel therapeutic product or indication, FDA generally will not approve the therapeutic product or new therapeutic product indication if the companion diagnostic device is not approved or cleared for that indication. Approval or clearance of the companion diagnostic device will ensure that the device has been adequately evaluated and has adequate performance characteristics in the intended population. The review of in vitro companion diagnostics in conjunction with the review of our therapeutic treatments for cancer will, therefore, likely involve coordination of review by the FDA’s Center for Drug Evaluation and Research and the FDA’s Center for Devices and Radiological Health Office of In Vitro Diagnostics Device Evaluation and Safety.
Under the FDCA, in vitro diagnostics, including companion diagnostics, are regulated as medical devices. In the United States, the FDCA and its implementing regulations, and other federal and state statutes and regulations govern, among other things, medical device design and development, preclinical and clinical testing, premarket clearance or approval, registration and listing, manufacturing, labeling, storage, advertising and promotion, sales and distribution, export and import, and post-market surveillance. Unlessthe IRA’s Drug Price Negotiation Program for Medicare constitutes an exemption applies, diagnostic tests require marketing clearance or approval fromuncompensated taking in violation of the FDA prior to commercial distribution. The two primary typesFifth Amendment of FDA marketing authorization applicable to a medical device are premarket notification, also called 510(k) clearance, and premarket approval, or PMA approval.
The PMA process,the Constitution. Subsequently, several other parties, including the gatheringU.S. Chamber of clinicalCommerce and preclinical datapharmaceutical companies, also filed lawsuits in various courts with similar constitutional claims against HHS and the submission toCMS. Litigation involving these and review by the FDA, can take several years or longer. It involves a rigorous premarket review during which the applicant must prepare and provide the FDA with reasonable assuranceother provisions of the device’s safetyIRA will continue with unpredictable and effectivenessuncertain results.
At the state level, individual states are increasingly aggressive in passing legislation and implementing regulations designed to control pharmaceutical and biological product pricing, including price or patient reimbursement constraints, discounts, restrictions on certain product access and marketing cost disclosure and transparency measures, and, in some cases, designed to encourage importation from other countries and bulk purchasing. Many states have required drug manufacturers and other entities in the drug supply chain, including health carriers, pharmacy benefit managers and wholesale distributors, to disclose information about the device and its components regarding, among other things, device design, manufacturing and labeling. PMA applications are subject to an application fee, which exceeds $250,000 for most PMAs.pricing of pharmaceuticals. In addition, PMAs for certain devices must generally include the results from extensive preclinicalregional health care authorities and adequateindividual hospitals are increasingly using bidding procedures to determine what pharmaceutical products and well-controlled clinical trials to establish the safety and effectiveness of the device for each indication for which FDA approval is sought. In particular, for a diagnostic, a PMA application typically requires data regarding analytical and clinical validation studies. As part of the PMA review, the FDAsuppliers will typically inspect the manufacturer’s facilities for compliance with the Quality System Regulation, or QSR, which imposes elaborate testing, control, documentationbe included in their prescription drug and other quality assurance requirements.
PMA approval is not guaranteed, and the FDA may ultimately respond to a PMA submission with a not approvable determination based on deficiencies in the application and require additional clinical trial or other data that may be expensive and time-consuming to generate and that can substantially delay approval. If the FDA’s evaluation of the PMA application is favorable, the FDA typically issues an approvable letter requiring the applicant’s agreement to specific conditions, such as changes in labeling, or specific additional information, such as submission of final labeling, in order to secure final approval of the PMA. If the FDA’s evaluation of the PMA or manufacturing facilities is not favorable, the FDA will deny approval of the PMA or issue a not approvable letter. A not approvable letter will outline the deficiencies in the application and, where practical, will identify what is necessary to make the PMA approvable. The FDA may also determine that additional clinical trials are necessary, in which case the PMA approval may be delayed for several months or years while the trials are conducted and then the data submitted in an amendment to the PMA. If the FDA concludes that the applicable criteria have been met, the FDA will issue a PMA for the approved indications, which can be more limited than those originally sought by the applicant. The PMA can include post-approval conditions that the FDA believes necessary to ensure the safety and effectiveness of the device, including, among other things, restrictions on labeling, promotion, sale and distribution. Once granted, PMA approval may be withdrawn by the FDA if compliance with post approval requirements, conditions of approval or other regulatory standards are not maintained or problems are identified following initial marketing.
After a device is placed on the market, it remains subject to significant regulatory requirements. Medical devices may be marketed only for the uses and indications for which they are cleared or approved. Device manufacturers must also establish registration and device listings with the FDA. A medical device manufacturer’s manufacturing processes and those of its suppliers are required to comply with the applicable portions of the

QSR, which cover the methods and documentation of the design, testing, production, processes, controls, quality assurance, labeling, packaging and shipping of medical devices. Domestic facility records and manufacturing processes are subject to periodic unscheduled inspections by the FDA. The FDA also may inspect foreign facilities that export products to the United States.health care programs.
Review and Approval of DrugMedicinal Products in the European Union
In order to market any product outside of the United States, a companysponsor must also comply with numerous and varying regulatory requirements of other countries and jurisdictions regarding quality, safety and efficacy, and governing, among other things, clinical trials, marketing authorization, commercial sales and distribution of products. Whether or not it obtains FDA approval for a product, the company woulda sponsor will need to obtain the necessary approvals by the comparable foreignnon-U.S. regulatory authorities before it can commence clinical trials or marketing of the product in those countries or jurisdictions. The approvalSpecifically, the process ultimately varies between countries and jurisdictions and can involve additional product testing and additional administrative review periods. The time required to obtain approval in other countries and jurisdictions might differ from and be longer than that required to obtain FDA approval. Regulatory approval in one country or jurisdiction does not ensure regulatory approval in another, but a failure or delay in obtaining regulatory approval in one country or jurisdiction may negatively impact the regulatory process in others.
Procedures governing approval of drugmedicinal products in the European Union
PursuantEU generally follows the same lines as in the United States. It entails satisfactory completion of preclinical studies and adequate and well-controlled clinical trials to establish the safety and efficacy of the product for each proposed indication. It also requires the submission to the Europeanrelevant competent authorities of a marketing authorization application, or MAA, and granting of a marketing authorization by these authorities before the product can be marketed and sold in the EU.
Clinical Trial Approval
On January 31, 2022, the Clinical Trials Regulation (EU) No 536/2014, or the Clinical Trials Regulation, became effective in the EU and replaced the prior Clinical Trials Directive a system2001/20/EC. The Clinical Trials Regulation aims to simplify and streamline the authorization, conduct and transparency of clinical trials in the EU. Under the new coordinated procedure for the approval of clinical trials, the sponsor of a clinical trial to be conducted in more than one Member State of the EU, or EU Member State, will only be required to submit a single application for approval. The submission will be made through the Clinical Trials Information System, a new clinical trials portal overseen by the EMA, and available to clinical trial sponsors, competent authorities of the EU Member States and the public.
Beyond streamlining the process, the Clinical Trials Regulation includes a single set of documents to be prepared and submitted for the application as well as simplified reporting procedures for clinical trial sponsors; and a harmonized procedure for the assessment of applications for clinical trials, which is divided in two parts. Part I is assessed by the competent authorities of all EU Member States in which an application for authorization of a clinical trial has been submitted, or EU Member States
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concerned. Part II is assessed separately by each EU Member State concerned. Strict deadlines have been established for the assessment of clinical trial applications. The role of the relevant ethics committees in the E.U. has been implemented throughassessment procedure will continue to be governed by the national legislationlaw of the member states. Under this system, an applicantEU Member State concerned. However, overall related timelines will be defined by the Clinical Trials Regulation.
The Clinical Trials Regulation did not change the preexisting requirement that a sponsor must obtain prior approval from the competent national authority of a E.U. member statethe EU Member State in which the clinical trial is to be conducted. If the clinical trial is conducted in different EU Member States, the competent authorities in each of these EU Member States must provide their approval for the conduct of the clinical trial. Furthermore, the applicantsponsor may only start a clinical trial at a specific clinical site after a competentthe applicable ethics committee has issued a favorable opinion. A
Parties conducting certain clinical trials must, as in the United States, post clinical trial application,information in the EU at the EudraCT website.
Priority Medicines (PRIME) Designation in the EU
In March 2016, the EMA launched an initiative to facilitate development of product candidates in indications, often rare, for which few or CTA, must be accompanied by an investigational medicinalno therapies currently exist. The priority medicines, or PRIME, scheme is intended to encourage drug development in areas of unmet medical need and provides accelerated assessment of products representing substantial innovation reviewed under the centralized procedure. Products from small- and medium-sized enterprises may qualify for earlier entry into the PRIME scheme than larger companies. Many benefits accrue to sponsors of product candidates with PRIME designation, including but not limited to, early and proactive regulatory dialogue with the EMA, frequent discussions on clinical trial designs and other development program elements, and accelerated MAA assessment once a dossier has been submitted. Importantly, a dedicated agency contact and rapporteur from the Committee for Human Medicinal Products, or IMPD, with supporting information prescribed byCHMP, or Committee for Advanced Therapies are appointed early in the European Clinical Trials Directive and corresponding national lawsPRIME scheme facilitating increased understanding of the member states and further detailed in applicable guidance documents.product at EMA’s Committee level.
Marketing Authorization
To obtain a marketing approval ofauthorization for a product under E.U.EU regulatory systems, an applicanta sponsor must submit an MAA either under a centralized procedure administered by the EMA, or one of the procedures administered by competent authorities in the EU Member States, decentralized procedure; national procedure; or mutual recognition procedure.
The centralized procedure provides for the grant of a single marketing authorization by the European CommissionEMA that is valid forin all E.U. member states.EU Member States, as well as Iceland, Liechtenstein and Norway. The centralized procedure is compulsory for specific products, including for medicines produced by certain biotechnological processes, products designated as orphan medicinal products, advanced therapy medicinal products, and products with a new active substance indicated for the treatment of certain diseases. For products with a new active substance indicated for the treatment of other diseases and products that are highly innovative or for which a centralized process is in the interest of patients, the centralized procedure may be optional. The centralized procedure may at the request of the sponsor also be used in certain other cases. The centralized procedure is optional for products that represent a significant therapeutic, scientific or technical innovation, or whose authorization would be in the interest of public health.
Under the centralized procedure, the Committee for Medicinal Products for Human Use, or the CHMP, established at the EMA is responsible for conducting the initial assessment of a product. The CHMP is also responsible for several post‑authorization and maintenance activities, such as the assessment of modifications or extensions to an existing marketing authorization. Under the centralized procedure in the E.U., the maximum timeframe for the evaluation of an MAA is 210 days, excluding clock stops, when additional information or written or oral explanation is to be provided by the applicantsponsor in response to questions of the CHMP. Accelerated evaluationassessment might be granted by the CHMP in exceptional cases, when a medicinal product is of major interest from the point of view of public health and in particular from the viewpoint of therapeutic innovation. In this circumstance,The timeframe for the EMA ensuresevaluation of an MAA under the accelerated assessment procedure is 150 days, excluding stop clocks.
There are also two other possible routes to authorize medicinal products in several EU countries, which are available for investigational medicinal products that fall outside the opinionscope of the CHMP is given within 150 days.centralized procedure:
TheDecentralized procedure. Using the decentralized procedure, is available to applicants who wish to market a productsponsor may apply for simultaneous authorization in various E.U. member states where such product hasmore than one EU country of medicinal products that have not received marketing approvalyet been authorized in any E.U.EU country and that do not fall within the mandatory scope of the centralized procedure. The sponsor may choose a member states before. The decentralized procedure provides for approval by one or more other, or concerned, member states of an assessment of an application performed by one member state designated by the applicant, known as the reference member state. Under thisstate to lead the scientific evaluation of the application.
Mutual recognition procedure an applicant submits an application based on identical dossiers and related materials, including. In the mutual recognition procedure, a draft summary of product characteristics, and draft labeling and package leaflet, tomedicine is first authorized in one EU Member State (which acts as the reference member state and concerned member states. The reference member state prepares a draft assessment report and drafts of the related materials within 210 days after receipt of a valid application. Within 90 days of receiving the reference member state’s assessment report and related materials, each concerned member state must decide whether to approve the assessment report and related materials.
If a member state cannot approve the assessment report and related materials on the grounds of potential serious risk to public health, the disputed points are subject to a dispute resolution mechanism and may eventually be referred to the European Commission, whose decision is binding on all member states.
Within this framework, manufacturers may seek approval of hybrid medicinal products under Article 10(3) of Directive 2001/83/EC. Hybrid applications rely, in part, on information and data from a reference product and new data from appropriate preclinical tests and clinical trials. Such applications are necessary when the proposed product does not meet the strict definition of a generic medicinal product, or bioavailability studies cannot be used to demonstrate bioequivalence, or there are

changes in the active substance(s)state), therapeutic indications, strength, pharmaceutical form or route of administration of the generic product compared to the reference medicinal product. In such cases the results of tests and trials must be consistent with the data content standards required in the Annex to the Directive 2001/83/EC, as amended by Directive 2003/63/EC.
Hybrid medicinal product applications have automatic access to the centralized procedure when the reference product was authorized for marketing via that procedure. Where the reference product was authorized via the decentralized procedure, a hybrid application may be accepted for consideration under the centralized procedure if the applicant shows that the medicinal product constitutes a significant therapeutic, scientific or technical innovation, or the granting of a community authorization for the medicinal product is in the interest of patients at the community level.
Clinical trial approval in the European Union
Requirements for the conduct of clinical trials in the E.U. including GCP are set forth in the Clinical Trials Directive 2001/20/EC and the GCP Directive 2005/28/EC. Pursuant to Directive 2001/20/EC and Directive 2005/28/EC, as amended, a system for the approval of clinical trials in the E.U. has been implemented through national legislation of the E.U. member states. Under this system, approval must be obtained from the competent national authority of each E.U. member state in which a study is planned to be conducted. To this end, a CTA is submitted, which must be supported by an IMPD and further supporting information prescribed by Directive 2001/20/EC and Directive 2005/28/EC and other applicable guidance documents. Furthermore, a clinical trial may only be started after a competent ethics committee has issued a favorable opinion on the CTA in that country.
In April 2014, the E.U. passed the new Clinical Trials Regulation, (EU) No 536/2014, which will replace the current Clinical Trials Directive 2001/20/EC. To ensure that the rules for clinical trials are identical throughout the E.U., the new E.U. clinical trials legislation was passed as a regulation that is directly applicable in all E.U. member states. All clinical trials performed in the E.U. are required to be conducted in accordance with the Clinical Trials Directive 2001/20/EC until the new Clinical Trials Regulation (EU) No 536/2014 becomes applicable. According to the current plans of the EMA, the new Clinical Trials Regulation will become applicable in 2019. The Clinical Trials Directive 2001/20/EC will, however, still apply three years from the date of entry into application of the Clinical Trials Regulation to (i) clinical trials applications submitted before the entry into application and (ii) clinical trials applications submitted within one year after the entry into application if the sponsor opts for old system.
The new Clinical Trials Regulation aims to simplify and streamline the approval of clinical trial in the E.U. The main characteristics of the regulation include: a streamlined application procedure via a single entry point, the E.U. portal; a single set of documents to be prepared and submitted for the application as well as simplified reporting procedures that will spare sponsors from submitting broadly identical information separately to various bodies and different member states; a harmonized procedure for the assessment of applications for clinical trials, which is divided in two parts (Part I is assessed jointly by all member states concerned, and Part II is assessed separately by each member state concerned); strictly defined deadlines for the assessment of CTAs; and the involvement of the ethics committees in the assessment procedure in accordance with the national lawprocedures of that country. Following this, further marketing authorizations can be progressively sought from other EU countries in a procedure whereby the countries concerned agree to recognize the validity of the member state concerned but within the overall timelines definedoriginal, national marketing authorization produced by the Clinical Trials Regulation.reference member state.
Periods
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Marketing authorization is valid for five years in principle andUnder the above-described procedures, before granting the marketing authorization, may be renewed after five years on the basis of a re‑evaluation of the risk‑benefit balance by the EMA or by the competent authority of the authorizing member state. To this end, the marketing authorization holder must provide the EMA or the competent authority with a consolidated versionauthorities of the file in respectMember States of the European Economic Area, or EEA, make an assessment of the risk-benefit balance of the product on the basis of scientific criteria concerning its quality, safety and efficacy, including all variations introduced sinceefficacy.
Conditional Approval
The European Commission may also grant a so-called “conditional marketing authorization” prior to obtaining the marketing authorization was granted, at least six months before the marketing authorization ceases to be valid. Once renewed, the marketing authorization is validcomprehensive clinical data required for an unlimited period, unlessapplication for a full marketing authorization. Such conditional marketing authorizations may be granted for product candidates (including medicines designated as orphan medicinal products), if (i) the European Commissionproduct candidate is intended for the treatment, prevention or medical diagnosis of seriously debilitating or life-threatening diseases, (ii) the competent authority decides, on justified grounds relating to pharmacovigilance, to proceed with one additional five‑year renewal. Any authorization which is not followed by the actual placingrisk-benefit balance of the drug onproduct candidate is positive; (iii) it is likely that the E.U. market (in casesponsor will be in a position to provide the required comprehensive clinical trial data; (iv) the product fulfills an unmet medical need; and (v) the benefit to public health of centralized procedure) orthe immediate availability on the market of the authorizing member state within three years aftermedicinal product concerned outweighs the risk inherent in the fact that additional data are still required. A conditional marketing authorization ceasesmay contain specific obligations to be fulfilled by the marketing authorization holder, including obligations with respect to the completion of ongoing or new clinical studies, and with respect to the collection of pharmacovigilance data. Conditional marketing authorizations are valid (the so‑called sunset clause).for one year, and may be renewed annually, if the risk-benefit balance remains positive, and after an assessment of the need for additional or modified conditions and/or specific obligations. The timelines for the centralized procedure described above also apply with respect to the review by the CHMP of applications for a conditional marketing authorization, but applicants can also request the EMA to conduct an accelerated assessment, for instance in cases of unmet medical needs.
Regulatory Data and market exclusivityProtection in the European UnionEU
In the E.U., new chemical entitiesEU, innovative medicinal products approved based on a complete independent data package qualify for eight years of data exclusivity upon marketing authorization and an additional two years of market exclusivity. This data exclusivity if granted,pursuant to Directive 2001/83/EC. Regulation (EC) No 726/2004 repeats this entitlement for medicinal products authorized in accordance with the centralized authorization procedure. Data exclusivity prevents regulatory authorities in the E.U.sponsors for authorization of generics of these innovative products from referencing the innovator’s data to assess a generic (abbreviated)(abridged) application for a period of eight years, after whichyears. During an additional two-year period of market exclusivity, a generic marketing authorizationMAA can be submitted and authorized, and the innovator’s data may be referenced, but not approved for two years.no generic medicinal product can be placed on the EU market until the expiration of the market exclusivity. The overall ten‑yearten-year period will be extended to a maximum of eleven11 years if, during the first eight years of those ten years, the marketing authorization holder obtains an authorization for one or more new therapeutic indications which, during the scientific evaluation prior to their authorization, are held to bring a significant clinical benefit in comparison with existing therapies. Even if a compound is considered to be a new chemical entity andan NCE so that the sponsor is able to gaininnovator gains the prescribed period of data exclusivity, another

company nevertheless could also market another version of the product if such company can complete a fullobtained marketing authorization based on an MAA with a complete databaseindependent data package of pharmaceutical, test, preclinical tests and clinical trialstrials.
Periods of Authorization and obtainRenewals
A marketing approvalauthorization has an initial validity for five years in principle. The marketing authorization may be renewed after five years based on a re-evaluation of the risk-benefit balance by the EMA or by the competent authority of the EU Member State. To this end, the marketing authorization holder must provide the EMA or the competent authority with a consolidated version of the file in respect of quality, safety and efficacy, including all variations introduced since the marketing authorization was granted, at least six months before the marketing authorization ceases to be valid. The European Commission or the competent authorities of the EU Member States may decide, on justified grounds relating to pharmacovigilance, to proceed with one additional five-year period of marketing authorization. Once subsequently definitively renewed, the marketing authorization shall be valid for an unlimited period. Any authorization which is not followed by the actual placing of the medicinal product on the EU market (in case of centralized procedure) or on the market of the authorizing EU Member State within three years after authorization ceases to be valid (the so-called sunset clause).
Pediatric Studies and Exclusivity
Prior to obtaining a marketing authorization in the EU, sponsors must demonstrate compliance with all measures included in an EMA-approved Pediatric Investigation Plan, or PIP, covering all subsets of the pediatric population, unless the EMA has granted a product-specific waiver, a class waiver, or a deferral for one or more of the measures included in the PIP. The respective requirements for all marketing authorization procedures are laid down in Regulation (EC) No 1901/2006, the so-called Pediatric Regulation. This requirement also applies when a company wants to add a new indication, pharmaceutical form or route of administration for a medicine that is already authorized. The Pediatric Committee of the EMA, or PDCO, may grant deferrals for some medicines, allowing a company to delay development of the medicine for children until there is enough information to demonstrate its product.effectiveness and safety in adults. The PDCO may also grant waivers when development of a medicine for children is not needed or not appropriate, such as for diseases that only affect the adult population. Before an MAA can be filed or an existing marketing authorization can be amended, the EMA requests that companies comply with the agreed studies and measures listed in each relevant PIP. If a sponsor obtains a marketing authorization in all EU Member States,
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or a marketing authorization granted in the centralized procedure by the European Commission, and the study results for the pediatric population are included in the product information, even when negative, the medicine is then eligible for an additional six month period of qualifying patent protection through extension of the term of the Supplementary Protection Certificate, or SPC, or alternatively a one year extension of the regulatory market exclusivity from ten to eleven years, as selected by the marketing authorization holder.
Orphan drug designationDrug Designation and exclusivityExclusivity
Regulation (EC) No. 141/2000, as implemented by Regulation (EC) No. 847/2000 provides that a drug shallcan be designated as an orphan drug by the European Commission if its sponsor can establish:establish that the product is intended for the diagnosis, prevention or treatment ofof: (1) a life‑threateninglife-threatening or chronically debilitating condition affecting not more than five in ten thousand10,000 persons in the European CommunityEU when the application is made,made; or that the product is intended for the diagnosis, prevention or treatment of(2) a life‑threatening,life-threatening, seriously debilitating or serious and chronic condition in the European CommunityEU and that without incentives it is unlikely that the marketing of the drug in the European CommunityEU would generate sufficient return to justify the necessary investment. For either of these conditions, the applicantsponsor must demonstrate that there exists no satisfactory method of diagnosis, prevention or treatment of the condition in question that has been authorized in the European CommunityEU or, if such method exists, the drug will be of significant benefit to those affected by that condition.
Regulation 847/2000 sets out criteriaOnce authorized, orphan medicinal products are entitled to 10 years of market exclusivity in all EU Member States and procedures governing designationa range of other benefits during the development and regulatory review process, including scientific assistance for study protocols, authorization through the centralized marketing authorization procedure covering all member countries, and a reduction or elimination of registration and marketing authorization fees. However, marketing authorization may be granted to a similar medicinal product with the same orphan drugs inindication during the E.U. Specifically, an application10-year period with the consent of the marketing authorization holder for designation as anthe original orphan medicinal product canor if the manufacturer of the original orphan medicinal product is unable to supply sufficient quantities. Marketing authorization may also be made any time priorgranted to a similar medicinal product with the same orphan indication if this product is safer, more effective or otherwise clinically superior to the filing of an application for approval to market theoriginal orphan medicinal product. Marketing authorization for an orphan drug leads to a ten‑yearThe period of market exclusivity. This periodexclusivity may, however,in addition, be reduced to six years if atit can be demonstrated on the endbasis of the fifth year, it is establishedavailable evidence that the product no longer meets the criteria fororiginal orphan drug designation, for example because themedicinal product is sufficiently profitable not to justify maintenance of market exclusivity. Market exclusivity can be revoked only in very selected cases, such as consent from the marketing authorization holder, inability
Patent Term Extensions
The EU also provides for patent term extension through SPCs. The rules and requirements for obtaining an SPC are similar to supply sufficient quantities of the product, demonstration of “clinically relevant superiority” by a similar medicinal product, or, after a review by the Committee for Orphan Medicinal Products, requested by a member state in the fifth year of the marketing exclusivity period (if the designation criteria are believed to no longer apply). Medicinal products designated as orphan drugs pursuant to Regulation 141/2000 shall be eligible for incentives made available by the European Community and by the member states to support research into, and the development and availability of, orphan drugs.
Regulatory requirements after marketing authorization
Asthose in the United States, bothStates. An SPC may extend the term of a patent for up to five years after its originally scheduled expiration date and can provide up to a maximum of 15 years of marketing authorization holders and manufacturers of medicinal productsexclusivity for a drug. In certain circumstances, these periods may be extended for six additional months if pediatric exclusivity is obtained. Although SPCs are subject to comprehensive regulatory oversightavailable throughout the EU, sponsors must apply on a country by country basis. Similar patent term extension rights exist in certain other foreign jurisdictions outside the EMA and the competent authorities of the individual E.U. Member States both before andEU.
Regulatory Requirements after grant of the manufacturing and marketing authorizations. The holder ofa Marketing Authorization has been Obtained
When an E.U. marketing authorization for a medicinal product must, for example,in the EU is obtained, the holder of the marketing authorization is required to comply with E.U. pharmacovigilance legislationa range of requirements applicable to the manufacturing, marketing, promotion and its related regulations and guidelines which entail many requirements for conducting pharmacovigilance, or the assessment and monitoring of the safetysale of medicinal products. These include:
The EU’s pharmacovigilance or safety reporting rules, which can impose post-authorization studies and additional monitoring obligations.
The manufacturing process forof authorized medicinal products, for which a separate manufacturer’s license is mandatory, must also be conducted in strict compliance with the E.U. is also highly regulatedapplicable EU laws, regulations and regulators may shut down manufacturing facilities that they believe do not comply with regulations. Manufacturing requires a manufacturing authorization,guidance, including Directive 2001/83/EC, Directive 2003/94/EC, Regulation (EC) No 726/2004 and the manufacturing authorization holder must comply with variousEuropean Commission Guidelines for Good Manufacturing Practice. These requirements set out in the applicable E.U. laws, includinginclude compliance with E.U.EU cGMP standards when manufacturing medicinal products and active pharmaceutical ingredients.API, including the manufacture of API outside of the EU with the intention to import the API into the EU.
In the E.U., the advertisingThe marketing and promotion of approved productsauthorized drugs, including industry-sponsored continuing medical education and advertising directed toward the prescribers of drugs and/or the general public, are strictly regulated in the EU notably under Directive 2001/83EC, as amended, and EU Member State laws. Direct-to-consumer advertising of prescription medicines is prohibited across the EU.
General Data Protection Regulation
Many countries outside of the United States maintain rigorous laws governing the privacy and security of personal information. The collection, use, disclosure, transfer, or other processing of personal data, including personal health data, regarding individuals who are located in the EEA, and the processing of personal data that takes place in the EEA, is subject to E.U. Member States’ laws governing promotionthe European Union General Data Protection Regulation, or GDPR, which became effective on May 25, 2018. The GDPR is wide-ranging in scope and imposes numerous requirements on companies that process personal data, including requirements relating
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to processing health and other sensitive data, obtaining consent of the individuals to whom the personal data relates, providing information to individuals regarding data processing activities, implementing safeguards to protect the security and confidentiality of personal data, providing notification of data breaches, and taking certain measures when engaging third-party processors. The GDPR also imposes strict rules on the transfer of personal data to countries outside the EEA, including the United States, and permits data protection authorities to impose large penalties for violations of the GDPR, including potential fines of up to €20 million or 4% of annual global revenues, whichever is greater. The GDPR also confers a private right of action on data subjects and consumer associations to lodge complaints with clinicians, misleadingsupervisory authorities, seek judicial remedies, and comparative advertisingobtain compensation for damages resulting from violations of the GDPR. Compliance with the GDPR will be a rigorous and unfair commercial practices.time-intensive process that may increase the cost of doing business or require companies to change their business practices to ensure full compliance. There are ongoing concerns about the ability of companies to transfer personal data from the EU to other countries. In July 2020, the Court of Justice of the European Union, or the CJEU, invalidated the EU-U.S. Privacy Shield framework, one of the mechanisms used to legitimize the transfer of personal data from the EEA to the United States. The CJEU decision also drew into question the long-term viability of an alternative means of data transfer, the standard contractual clauses, for transfers of personal data from the EEA to the United States. This CJEU decision may lead to increased scrutiny on data transfers from the EU to the United States generally and increase our costs of compliance with data privacy legislation as well as our costs of negotiating appropriate privacy and security agreements with our vendors and business partners.
Additionally, in October 2022, President Biden signed an executive order to implement the EU-U.S. Data Privacy Framework, which would serve as a replacement to the EU-U.S. Privacy Shield. The EU initiated the process to adopt an adequacy decision for the EU-U.S. Data Privacy Framework in December 2022 and the European Commission adopted the adequacy decision on July 10, 2023. The adequacy decision permits U.S. companies who self-certify to the EU-U.S. Data Privacy Framework to rely on it as a valid data transfer mechanism for data transfers from the EU to the United States. However, some privacy advocacy groups have already suggested that they will be challenging the EU-U.S. Data Privacy Framework. If these challenges are successful, they may not only impact the EU-U.S. Data Privacy Framework, but also further limit the viability of the standard contractual clauses and other data transfer mechanisms. The uncertainty around this issue has the potential to impact our business.
As with other issues related to withdrawal of the United Kingdom from the EU, there are open questions about how personal data will be protected in the United Kingdom and whether personal information can transfer from the EU to the United Kingdom. Following the withdrawal of the United Kingdom from the EU, the UK Data Protection Act 2018 applies to the processing of personal data that takes place in the United Kingdom and includes parallel obligations to those set forth by GDPR. While the Data Protection Act 2018 in the United Kingdom that “implements” and complements the GDPR has achieved Royal Assent on May 23, 2018 and is now effective in the United Kingdom, it is still unclear whether transfer of data from the EEA to the United Kingdom will remain lawful under GDPR. The UK government has already determined that it considers all EU and EEA member states to be adequate for the purposes of data protection, ensuring that data flows from the United Kingdom to the EU/EEA remain unaffected. In addition, other legislation adopted by individual E.U. Member States may applya recent decision from the European Commission appears to deem the United Kingdom as being “essentially adequate” for purposes of data transfer from the EU to the advertisingUnited Kingdom, although this decision may be re-evaluated in the future.
Beyond GDPR, there are privacy and promotiondata security laws in a growing number of medicinal products.countries around the world. While many loosely follow GDPR as a model, other laws contain different or conflicting provisions. These laws require that promotional materialswill impact our ability to conduct our business activities, including both our clinical trials and advertising in relation to medicinal products comply with the product’s Summaryany eventual sale and distribution of Product Characteristics, or SmPC, as approved by the competent authorities. Promotion of a medicinal product that does not comply with the SmPC is considered to constitute off‑label promotion, which is prohibited in the European Union.commercial products.
Brexit and the regulatory frameworkRegulatory Framework in the United Kingdom
The United Kingdom’s withdrawal from the EU took place on January 31, 2020. The EU and the United Kingdom reached an agreement on their new partnership in the Trade and Cooperation Agreement, which was applied provisionally beginning on January 1, 2021, and which entered into force on May 1, 2021. The Trade and Cooperation Agreement focuses primarily on free trade by ensuring no tariffs or quotas on trade in goods, including healthcare products such as medicinal products. The EU and the United Kingdom will form two separate markets governed by two distinct regulatory and legal regimes, except that Northern Ireland will continue to broadly follow EU laws as further described below. As such, the Trade and Cooperation Agreement seeks to minimize barriers to trade in goods while accepting that border checks will become inevitable as a consequence that the United Kingdom is no longer part of the single market. As of January 1, 2021, the Medicines and Healthcare products Regulatory Agency, or MHRA, became responsible for supervising medicines and medical devices in Great Britain, comprising England, Scotland, and Wales under domestic law whereas Northern Ireland continues to be subject to EU rules under the Northern Ireland Protocol.
On June 23, 2016,February 27, 2023, the electorateUnited Kingdom government and the European Commission announced a political agreement in principle to replace the Northern Ireland Protocol with a new set of arrangements, known as the “Windsor Framework”. This new framework fundamentally changes the existing system under the Northern Ireland Protocol, including with respect to the regulation of medicinal products in the United Kingdom. In particular, the MHRA will be responsible for approving all
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medicinal products destined for the United Kingdom market (i.e., Great Britain and Northern Ireland), and the EMA will no longer have any role in approving medicinal products destined for Northern Ireland. A single United Kingdom-wide marketing authorization will be granted by the MHRA for all medicinal products to be sold in the United Kingdom, or U.K. votedenabling products to be sold in favor of leavinga single pack and under a single authorization throughout the E.U, which is commonly referred to as “Brexit”. Thereafter,United Kingdom. The Windsor Framework was approved by the EU-United Kingdom Joint Committee on March 29, 2017,24, 2023. The United Kingdom government and the country formally notifiedEU will enact legislative measures to bring it into law. On June 9, 2023, the E.U. of its intention to withdraw pursuant to Article 50MHRA announced that the medicines aspects of the Lisbon Treaty.Windsor Framework will apply from January 1, 2025. The withdrawalHuman Medicines Regulations 2012 (SI 2012/1916) (as amended), or HMR, is the primary legal instrument for the regulation of medicines in the U.K.United Kingdom. The HMR has incorporated into the domestic law the body of EU law instruments governing medicinal products that pre-existed prior to the United Kingdom’s withdrawal from the E.U.EU.
EU laws which have been transposed into United Kingdom law through secondary legislation continue to be applicable as “retained EU law”. However, new legislation such as the Clinical Trials Regulation will take effect either on the effective datenot be applicable in Great Britain. Since a significant proportion of the withdrawal agreement or, in the absence of agreement, two years after the U.K. provides a notice of withdrawal pursuant to the E.U. Treaty. Since the regulatory framework for pharmaceutical products in the U.K.United Kingdom covering the quality, safety, and efficacy of pharmaceutical products, clinical trials, marketing authorization,authorizations, commercial sales, and distribution of pharmaceutical products is derived from E.U.EU directives and regulations, Brexit could materiallymay have a material impact upon the future regulatory regime which applieswith respect to productsthe development, manufacture, importation, approval, and the approvalcommercialization of our product candidates in the U.K. It remains to be seen how, if at all, Brexit will impact regulatory requirements for product candidates and products inUnited Kingdom. For example, the U.K.

Pharmaceutical Coverage, Pricing and Reimbursement
Significant uncertainty exists as to the coverage and reimbursement status of products approvedUnited Kingdom is no longer covered by the FDAcentralized procedures for obtaining EU-wide marketing authorizations from the EMA, and other government authorities. Sales of productsa separate marketing authorization will depend, in part, on the extentbe required to which third‑party payors, including government health programsmarket our product candidates in the United States such as MedicareKingdom. A new international recognition framework has been in place since January 1, 2024, whereby the MHRA will have regard to decisions on the approval of marketing authorizations made by the EMA and Medicaid, commercial health insurers and managed care organizations, provide coverage, and establish adequate reimbursement levels for, such products. The process forcertain other regulators when determining whether a payor will provide coveragean application for a product may be separate from the processnew Great Britain marketing authorization.
Pricing Decisions for setting the price or reimbursement rate that the payor will pay for the product once coverage is approved. Third‑party payors are increasingly challenging the prices charged, examining the medical necessity, and reviewing the cost‑effectiveness of medical products and services and imposing controls to manage costs. Third‑party payors may limit coverage to specific products on an approved list, or formulary, which might not include all of the approved products for a particular indication.
In order to secure coverage and reimbursement for any product that might be approved for sale, a company may need to conduct expensive pharmacoeconomic studies in order to demonstrate the medical necessity and cost‑effectiveness of the product, in addition to the costs required to obtain FDA or other comparable regulatory approvals. Nonetheless, product candidates may not be considered medically necessary or cost effective. Additionally, a payor’s decision to provide coverage for a drug product does not imply that an adequate reimbursement rate will be approved. Further, one payor’s determination to provide coverage for a drug product does not assure that other payors will also provide coverage for the drug product. Third‑party reimbursement may not be sufficient to maintain price levels high enough to realize an appropriate return on investment in product development.
The containment of healthcare costs also has become a priority of federal, state and foreign governments and the prices of drugs have been a focus in this effort. Governments have shown significant interest in implementing cost‑containment programs, including price controls, restrictions on reimbursement and requirements for substitution of generic products. Adoption of price controls and cost‑containment measures, and adoption of more restrictive policies in jurisdictions with existing controls and measures, could further limit a company’s revenue generated from the sale of any approved products. Coverage policies and third‑party reimbursement rates may change at any time. Even if favorable coverage and reimbursement status is attained for one or more products for which a company or its collaborators receive regulatory approval, less favorable coverage policies and reimbursement rates may be implemented in the future.
Outside the United States, ensuring adequate coverage and payment for our product candidates will face challenges. Pricing of prescription pharmaceuticals is subject to governmental control in many countries. Pricing negotiations with governmental authorities can extend well beyond the receipt of regulatory marketing approval for a product and may require us to conduct a clinical trial that compares the cost effectiveness of our product candidates or products to other available therapies. The conduct of such a clinical trial could be expensive and result in delays in our commercialization efforts.Approved Products
In the E.U.,EU, pricing and reimbursement schemes vary widely from country to country. Some countries provide that drug products may be marketed only after a reimbursement price has been agreed. Some countries may require the completion of additional studies that compare the cost‑effectivenesscost-effectiveness of a particular drugproduct candidate to currently available therapies.therapies or so-called health technology assessments, in order to obtain reimbursement or pricing approval. For example, the E.U.EU provides options for its member statesMember States to restrict the range of drug products for which their national health insurance systems provide reimbursement and to control the prices of medicinal products for human use. E.U. member statesMember States may approve a specific price for a drug product or it may instead adopt a system of direct or indirect controls on the profitability of the company placing the drug product on the market. Other member statesMember States allow companies to fix their own prices for drug products, but monitor and control company profits.prescription volumes and issue guidance to physicians to limit prescriptions. Recently, many countries in the EU have increased the amount of discounts required on pharmaceuticals, and these efforts could continue as countries attempt to manage health care expenditures, especially in light of the severe fiscal and debt crises experienced by many countries in the EU. The downward pressure on healthcarehealth care costs in general, particularly prescription drugs,products, has become intense. As a result, increasingly high barriers are being erected to the entry of new products. In addition, in some countries, cross‑border imports from low‑priced markets exert competitive pressurePolitical, economic and regulatory developments may further complicate pricing negotiations, and negotiations may continue after reimbursement has been obtained. Reference pricing used by various Member States, and parallel trade (i.e., arbitrage between low-priced and high-priced Member States), can further reduce prices. There can be no assurance that may reduce pricing within a country. Anyany country that haswith price controls or reimbursement limitations for drugpharmaceutical products may notwill allow favorable reimbursement and pricing arrangements.
Healthcare Law and Regulation
Healthcare providers and third‑party payors play a primary role in the recommendation and prescription of drug products that are granted regulatory approval. Arrangements with providers, consultants, third‑party payors and customers are subject to broadly applicable fraud and abuse and other healthcare laws and regulations that may constrain our business and/or financial arrangements. Such restrictions under applicable federal and state healthcare laws and regulations, include the following:
the federal Anti‑Kickback Statute, which prohibits, among other things, persons and entities from knowingly and willfully soliciting, offering, receiving or providing remuneration, directly or indirectly, in cash or in kind, to induce or reward either the referral of an individual for, or the purchase, order or recommendation of, any good or service, for which payment may be made, in whole or in part, under a federal healthcare program such as Medicare and Medicaid;

the federal civil and criminal false claims laws, including the civil False Claims Act, and civil monetary penalties laws, which prohibit individuals or entities from, among other things, knowingly presenting, or causing to be presented, to the federal government, claims for payment that are false or fraudulent or making a false statement to avoid, decrease or conceal an obligation to pay money to the federal government;
the federal Health Insurance Portability and Accountability Act of 1996, or HIPAA, which created additional federal criminal laws that prohibit, among other things, knowingly and willingly executing, or attempting to execute, a scheme to defraud any healthcare benefit program or making false statements relating to healthcare matters;
HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act and its implementing regulations, which also imposes obligations, including mandatory contractual terms, with respect to safeguarding the privacy, security and transmission of individually identifiable health information;
the federal transparency requirements known as the federal Physician Payments Sunshine Act, under the Patient Protection and Affordable Care Act, as amended by the Health Care Education Reconciliation Act, or the Affordable Care Act, which requires certain manufacturers of drugs, devices, biologics and medical supplies to report annually to the Centers for Medicare & Medicaid Services, or CMS, within the U.S. Department of Health and Human Services, information related to payments and other transfers of value to clinicians and teaching hospitals and clinician ownership and investment interests; and
analogous state and foreign laws and regulations, such as state anti‑kickback and false claims laws, which may apply to healthcare items or services that are reimbursed by non‑governmental third‑party payors, including private insurers.
Some state laws require pharmaceutical companies to comply with the pharmaceutical industry’s voluntary compliance guidelines and the relevant compliance guidance promulgated by the federal government in addition to requiring drug manufacturers to report information related to payments to clinicians and other healthcare providers or marketing expenditures. State and foreign laws also govern the privacy and security of health information in some circumstances, many of which differ from each other in significant ways and often are not preempted by HIPAA, thus complicating compliance efforts.
Healthcare Reform
A primary trend in the United States healthcare industry and elsewhere is cost containment. There have been a number of federal and state proposals during the last few years regarding the pricing of pharmaceutical and biopharmaceutical products, limiting coverage and reimbursement for drugs and other medical products, government control and other changes to the healthcare system in the United States.
By way of example, the United States and state governments continue to propose and pass legislation designed to reduce the cost of healthcare. In March 2010, the United States Congress enacted the Affordable Care Act, which, among other things, includes changes to the coverage and payment for products under government health care programs. Among the provisions of the Affordable Care Act of importance to our potential drug candidates are:
an annual, nondeductible fee on any entity that manufactures or imports specified branded prescription drugs and biologic agents, apportioned among these entities according to their market share in certain government healthcare programs, although this fee would not apply to sales of certain products approved exclusively for orphan indications;
expansion of eligibility criteria for Medicaid programs by, among other things, allowing states to offer Medicaid coverage to certain individuals with income at or below 133% of the federal poverty level, thereby potentially increasing a manufacturer’s Medicaid rebate liability;
expanded manufacturers’ rebate liability under the Medicaid Drug Rebate Program by increasing the minimum rebate for both branded and generic drugs and revising the definition of “average manufacturer price,” or AMP, for calculating and reporting Medicaid drug rebates on outpatient prescription drug prices and extending rebate liability to prescriptions for individuals enrolled in Medicare Advantage plans;
addressed a new methodology by which rebates owed by manufacturers under the Medicaid Drug Rebate Program are calculated for drugs that are inhaled, infused, instilled, implanted or injected;
expanded the types of entities eligible for the 340B drug discount program;
established the Medicare Part D coverage gap discount program by requiring manufacturers to provide a 50% point-of-sale-discount off the negotiated price of applicable brand drugs to eligible beneficiaries during their

coverage gap period as a condition for the manufacturers’ outpatient drugs to be covered under Medicare Part D;
a new Patient-Centered Outcomes Research Institute to oversee, identify priorities in, and conduct comparative clinical effectiveness research, along with funding for such research;
the Independent Payment Advisory Board, or IPAB, which has authority to recommend certain changes to the Medicare program to reduce expenditures by the program that could result in reduced payments for prescription drugs. However, the IPAB implementation has been not been clearly defined. PPACA provided that under certain circumstances, IPAB recommendations will become law unless Congress enacts legislation that will achieve the same or greater Medicare cost savings; and
established the Center for Medicare and Medicaid Innovation within CMS to test innovative payment and service delivery models to lower Medicare and Medicaid spending, potentially including prescription drug spending. Funding has been allocated to support the mission of the Center for Medicare and Medicaid Innovation from 2011 to 2019.
Other legislative changes have been proposed and adopted since the PPACA was enacted. These changes include the Budget Control Act of 2011, which, among other things, led to aggregate reductions to Medicare payments to providers of up to 2% per fiscal year that started in 2013 and will stay in effect through 2024 unless additional Congressional action is taken, and the American Taxpayer Relief Act of 2012, which, among other things, reduced Medicare payments to several types of providers and increased the statute of limitations period for the government to recover overpayments to providers from three to five years. These new laws may result in additional reductions in Medicare and other healthcare funding and otherwise affect the prices we may obtainarrangements for any of our product candidates for which we may obtain regulatory approval or the frequency with which any such product candidate is prescribed or used. Further, there have been several recent U.S. congressional inquiries and proposed state and federal legislation designed to, among other things, bring more transparency to drug pricing, review the relationship between pricing and manufacturer patient programs, reduce the costs of drugs under Medicare and reform government program reimbursement methodologies for drug products.
These healthcare reforms, as well as other healthcare reform measures that may be adoptedproducts, if approved in the future, may result in additional reductions in Medicare and other healthcare funding, more rigorous coverage criteria, new payment methodologies and additional downward pressure on the price for any approved product and/or the level of reimbursement physicians receive for administering any approved product. Reductions in reimbursement levels may negatively impact the prices or the frequency with which products are prescribed or administered. Any reduction in reimbursement from Medicare or other government programs may result in a similar reduction in payments from private payors. Since enactment of the ACA, there have been numerous legal challenges and Congressional actions to repeal and replace provisions of the law. In May 2017, the U.S. House of Representatives passed legislation known as the American Health Care Act of 2017. Thereafter, the Senate Republicans introduced and then updated a bill to replace the ACA known as the Better Care Reconciliation Act of 2017. The Senate Republicans also introduced legislation to repeal the ACA without companion legislation to replace it, and a “skinny” version of the Better Care Reconciliation Act of 2017. In addition, the Senate considered proposed healthcare reform legislation known as the Graham-Cassidy bill. None of these measures was passed by the U.S. Senate.
The Trump Administration has also taken executive actions to undermine or delay implementation of the ACA. In January 2017, President Trump signed an Executive Order directing federal agencies with authorities and responsibilities under the ACA to waive, defer, grant exemptions from, or delay the implementation of any provision of the ACA that would impose a fiscal or regulatory burden on states, individuals, healthcare providers, health insurers, or manufacturers of pharmaceuticals or medical devices. In October 2017, the President signed a second Executive Order allowing for the use of association health plans and short-term health insurance, which may provide fewer health benefits than the plans sold through the ACA exchanges. At the same time, the Administration announced that it will discontinue the payment of cost-sharing reduction, or CSR, payments to insurance companies until Congress approves the appropriation of funds for such CSR payments. The loss of the CSR payments is expected to increase premiums on certain policies issued by qualified health plans under the ACA. A bipartisan bill to appropriate funds for CSR payments was introduced in the Senate, but the future of that bill is uncertain.
More recently, with enactment of the Tax Cuts and Jobs Act of 2017, which was signed by the President on December 22, 2017, Congress repealed the “individual mandate.” The repeal of this provision, which requires most Americans to carry a minimal level of health insurance, will become effective in 2019. According to the Congressional Budget Office, the repeal of the individual mandate will cause 13 million fewer Americans to be insured in 2027 and premiums in insurance markets may rise.
Further, each chamber of the Congress has put forth multiple bills designed to repeal or repeal and replace portions of the ACA. Although none of these measures has been enacted by Congress to date, Congress may consider other legislation to repeal and replace elements of the ACA. The Congress will likely consider other legislation to replace elements of the ACA, during the next Congressional session.

those countries.
Segment Reporting and Geographical Information
We are engaged solely in the discovery and development of medicines in the field of cellular metabolism. Accordingly, we have determined that we operate in one operating segment. For segment
Employees and geographical financial information, see Note 2, Summary of Significant Accounting Policies, to the financial statements appearing elsewhere in this Annual Report on Form 10-K, which are incorporated herein by reference.
Our Scientific Founders and Advisors
Founders
Our founders are eminent scientists and authorities in cancer who have pioneered key advances in the field of cancer metabolism. Together, they provide scientific leadership and expertise in this field.
Lewis C. Cantley, Ph.D. Dr. Cantley is director of the Cancer Center at Weill Cornell Medical College and New York-Presbyterian Hospital. Dr. Cantley is a foremost expert in understanding the biochemical pathways linking cancer and energy metabolism.
Tak W. Mak, Ph.D. Dr. Mak is professor of medical biophysics, University of Toronto; director of the Advanced Medical Discovery Institute; and director of the Campbell Family Institute for Breast Cancer Research. Dr. Mak is a preeminent researcher of the biology of the immune system, the biology of apoptosis and the pathogenesis of cancer.
Craig B. Thompson, M.D. Dr. Thompson is president and CEO of Memorial Sloan-Kettering Cancer Center. Dr. Thompson is an authority in the study of how genes regulate apoptosis and metabolism and investigates their application in treating cancer.
Scientific Advisors
We have assembled a world-class scientific advisory board that includes renowned experts in cancer metabolism, oncology, drug discovery and translational medicine. These advisors work in close collaboration with our scientists to identify new research directions and accelerate our target validation and drug discovery programs.
NamePrimary affiliation
Joan Brugge, Ph.D.Harvard Medical School
Lewis C. Cantley, Ph.D.The Cancer Center at Weill Cornell Medical College and New York-Presbyterian Hospital
Ralph Deberardinis, M.D., Ph.D.Children's Medical Center Research Institute at University of Texas Southwestern
William G. Kaelin, Jr., M.D.Dana-Farber Cancer Institute and Harvard Medical School
Tak W. Mak, Ph.D.University of Toronto and the Campbell Family Institute for Breast Cancer Research
Pier Paolo Pandolfi, M.D., Ph.D.Beth Israel Deaconess Medical Center
Charles Sawyers, M.D.Memorial Sloan-Kettering Cancer Center
Shin-San Michael Su, Ph.D.Decibel Therapeutics
Marc Tessier-Lavigne, Ph.D.Stanford University
Craig B. Thompson, M.D.Memorial Sloan-Kettering Cancer Center
Matthew Vander Heiden, M.D., Ph.D.Koch Institute for Integrative Cancer Research at Massachusetts Institute of Technology
EmployeesHuman Capital
As of December 31, 2017,2023, we had 382383 full-time employees including 132and 3 part-time employees, withall based in the United States and of which 100 held Ph.D., Pharm.D. or M.D. or Ph.D. degrees. Of these full-time employees, 274 employees are engaged in research and development activities. None of our employees are represented by a labor union or covered byunder a collective bargaining agreement. We consideralso retain independent contractors to support the goals of our relationshiporganization. We prioritize our employee experience and we are proud of our strong employee and contractor relations.
We understand that attracting, retaining, engaging and supporting our talented team and maintaining a diverse and inclusive organization is critical to our success and our ability to increase the value we can provide for patients, shareholders and all stakeholders.
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We strive to cultivate a positive, respectful and fair work environment guided by the following three pillars:
Flexibility: We provide flexible work arrangements which result in happier, more engaged and more productive employees. We encourage a culture that promotes different perspectives, different work styles, health and wellness, care of families and productivity.
Psychological safety: We aim to ensure our teams experience psychological safety – the belief that risk-taking and failure will not be punished, which leads to higher performing teams, more creativity, candor and better results.
Deliberate development: We emphasize providing ongoing opportunities for employees to grow professionally, whether through bringing in external speakers, offering preceptorships in different departments, and providing tuition reimbursement and leadership skills training.
To incentivize and reward strong performance, we have adopted a pay for performance philosophy and we provide competitive and balanced compensation and benefits package, including short-term and long-term incentives, discretionary paid time off policy, generous parental and family leave plans and premium medical benefits.
We are committed to fostering a welcoming and diverse workplace in which individuals from a variety of backgrounds can thrive. Our diversity and inclusion program focuses on valuing three types of differences:
Representative differences (demographic diversity, such as gender, race, ethnicity, sexual orientation)
Experiential differences (identities based on life experiences that may change over time)
Cognitive differences (unique ways of understanding and interpreting the world)
We set goals and track our progress to ensure that we continue to incorporate different voices across the business. We have an active cross-functional diversity council that furthers our commitment to building a diverse and inclusive organization by:
Representing and reflecting the different voices in the Agios community
Furthering the work of diversity, equity and inclusion at Agios and in our communities
Working in partnership with our employeesleadership, human resources and employee resource groups to share, drive and lead our diversity, equity and inclusion efforts
We are a majority female organization and maintain significant representation at all levels, including the Board of Directors. As of December 31, 2023, 59% of our workforce were women. Racial and ethnic diversity continues to be good.an area of focus at the Company. As of December 31, 2023, 33% of our workforce were ethnically diverse and 47% of all new hires that joined the Company in 2023 were ethnically diverse. We recognize that there is still important progress to be made, particularly as it relates to Black and Latino representation at our company, and this remains an area of continued emphasis for us.
We regularly evaluate the effectiveness of our human capital management practices through employee surveys and fostering a culture of ongoing feedback and two-way dialogue. We received feedback from employees that helped to inform how we approach programs and opportunities to improve the employee experience heading into 2024. In addition, we track important human capital metrics such as turnover rate. Voluntary and involuntary turnover rates across all levels (executives/ senior managers, mid-level managers and professionals) are in alignment with the industry average.
We are committed to providing employees with an opportunity to choose the right working arrangement for them based on their role: whether remote, hybrid, or onsite in our Cambridge office, and we continue to evaluate how we can enhance these arrangements for an optimal employee experience. The opportunity to work remotely has enabled us to hire a more diverse team including individuals from different locations and backgrounds and with a variety of responsibilities in their personal lives. In 2023, 84% of our new hires chose to work remotely and our overall organization now has a majority population of remote workers representing 59% of all employees.
We believe our ability to evolve with the ever-changing environment, coupled with our long-standing culture and values around flexibility and connection, continue to help us deliver for patients.
Our Corporate Information
We were incorporated under the laws of the State of Delaware in August 2007. Our executive offices are located at 88 Sidney Street, Cambridge, Massachusetts 02139, and our telephone number is (617) 649-8600. Our website address is www.agios.com. References to our website are inactive textual references only and the content of our website should not be deemed incorporated by reference into this Annual Report on Form 10-K.

Available Information
Our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and any amendments to these reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, are
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available free of charge on our website located at www.agios.com as soon as reasonably practicable after they are filed with or furnished to the Securities and Exchange Commission, or SEC. These reports are also available at the SEC’s website at www.sec.gov. The public may also read and copy any materials filed with the SEC at the SEC’s Public Reference Room at 100 F Street, N.E., Washington D.C. 20549. Information on the operation of the Public Reference Room may be obtained by calling the SEC at 1-800-SEC-0330.
A copy of our Corporate Governance Guidelines, Code of Business Conduct and Ethics and the charters of the Audit Committee, Compensation and People Committee, and Nominating and Corporate Governance Committee, and Science and Technology Committee are posted on our website, www.agios.com, under the heading “Corporate Governance” and are available in print to any person who requests copies by contacting us by calling (617) 649-8600 or by writing to Agios Pharmaceuticals, Inc., 88 Sidney Street, Cambridge, Massachusetts 02139.
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Item 1A. Risk Factors
The following risk factors and other information included in this Annual Report on Form 10-K should be carefully considered. The risks and uncertainties described below are not the only risks and uncertainties we face. Additional risks and uncertainties not presently known to us or that we presently deem less significant may also impair our business operations. Please see page 1 of this Annual Report on Form 10-K for a discussion of some of the forward-looking statements that are qualified by these risk factors. If any of the following risks occur, our business, financial condition, results of operations and future growth prospects could be materially and adversely affected.
Risks Related to Our Financial Position and Need for Additional Capital
We have incurred significant losses since inception. We expect to incur losses for the foreseeable future and may never achieve or maintain profitability.
Since inception, we have incurred significant operating losses. Our net losses were $314.7 million, $198.5 million and $117.7 million for the years ended December 31, 2017, 2016 and 2015, respectively. As of December 31, 2017, we had an accumulated deficit of $798.1 million. Other than revenue from royalties on sales of IDHIFA®, we have not generated any revenue from product sales. Our most advanced product candidates are in clinical development stages and we have not yet obtained marketing approval for a product candidate, other than U.S. Food and Drug Administration's, or FDA, approval of IDHIFA® in August 2017 for the treatment of adult patients with relapsed or refractory acute myeloid leukemia, or R/R AML, and an IDH2 mutation as detected by an FDA-approved test. We have financed our operations primarily through private placements of our preferred stock, our initial public offering and the concurrent private placement, our follow-on public offerings and our collaboration agreements with Celgene Corporation and its subsidiaries, or Celgene, focused on cancer metabolism and metabolic immuno-oncology. We have devoted substantially all of our efforts to research and development. Although we may from time to time report profitable results, we expect to continue to incur significant expenses and increasing operating losses for the foreseeable future. The net losses we incur may fluctuate significantly from quarter to quarter. We anticipate that our expenses will increase substantially if and as we:
initiate and continue clinical trials for our product candidates, including: ivosidenib, AG-881, AG-348, and AG-270;
continue our research and preclinical development of our product candidates;
seek to identify additional product candidates;
seek marketing approvals for our product candidates that successfully complete clinical trials;
establish a sales, marketing and distribution infrastructure to commercialize any medicines for which we may obtain marketing approval;
require the manufacture of larger quantities of product candidates for clinical development and, potentially, commercialization;
maintain, expand and protect our intellectual property portfolio;
hire additional clinical, quality control and scientific personnel;
add additional personnel to support our product development and planned future commercialization efforts and our operations;

add equipment and physical infrastructure to support our research and development; and
acquire or in-license other medicines and technologies.
To become and remain profitable, we must develop and eventually commercialize a medicine or medicines with significant market potential. This will require us to be successful in a range of challenging activities, including completing preclinical testing and clinical trials of our product candidates, obtaining marketing approval for these product candidates, manufacturing, marketing and selling those medicines for which we may obtain marketing approval and satisfying any post-marketing requirements. We may never succeed in these activities and, even if we do, may never generate revenue that are significant or large enough to achieve profitability. If we do achieve profitability, we may not be able to sustain or increase profitability on a quarterly or annual basis. Our failure to become and remain profitable would decrease the value of our company and could impair our ability to raise capital, maintain our research and development efforts, expand our business or continue our operations. A decline in the value of our company could also cause our stockholders to lose all or part of their investment.
We will need substantial additional funding. If we are unable to raise capital when needed, we would be forced to delay, reduce or eliminate our product development programs or commercialization efforts.
We expect our expenses to increase in connection with our ongoing activities, particularly as we continue the research and development of, initiate and continue clinical trials of, and seek marketing approvals for, our product candidates. For example, we submitted a new drug application, or NDA, for ivosidenib in IDH1 mutant-positive R/R AML in December 2017. Pursuant to the 2010 Agreement, we have certain co-promotion rights to IDHIFA® in the U.S. Although Celgene will reimburse us for our co-promotion efforts for IDHIFA® under the 2010 Agreement, if we obtain additional marketing approvals for any of our other product candidates, such as ivosidenib, we expect to incur significant commercialization expenses related to product sales, marketing, manufacturing and distribution to the extent that such sales, marketing, manufacturing and distribution are not the responsibility of Celgene or other collaborators. Accordingly, we will need to obtain substantial additional funding in connection with our continuing operations. If we are unable to raise capital when needed or on attractive terms, we would be forced to delay, reduce or eliminate our research and development programs or future commercialization efforts.
We expect that our existing cash, cash equivalents and marketable securities as of December 31, 2017, together with the net proceeds from our January 2018 follow-on public offering, anticipated product and royalty revenue, anticipated interest income, anticipated expense reimbursements under our collaboration agreements, but excluding any additional program-specific milestone payments, will enable us to fund our operating expenses and capital expenditure requirements through at least the end of 2020. Our estimate as to how long we expect our existing cash and cash equivalents to be available to fund our operations is based on assumptions that may prove to be wrong, and we could use our available capital resources sooner than we currently expect. Further, changing circumstances, some of which may be beyond our control, could cause us to consume capital significantly faster than we currently anticipate, and we may need to seek additional funds sooner than planned. Our future capital requirements will depend on many factors, including:
the scope, progress, results and costs of drug discovery, preclinical development, laboratory testing and clinical trials for our product candidates;
the success of, and developments regarding, our collaborations;
the costs, timing and outcome of regulatory review of our product candidates;
the costs of preparing, filing and prosecuting patent applications, maintaining and enforcing our intellectual property rights and defending intellectual property-related claims;
our ability to establish and maintain additional collaborations on favorable terms, if at all; and
the extent to which we acquire or in-license other medicines and technologies.
Identifying potential product candidates and conducting preclinical testing and clinical trials is a time-consuming, expensive and uncertain process that takes years to complete, and we may never generate the necessary data or results required to obtain additional marketing approvals and achieve product sales. In addition, our product candidates, if approved, may not achieve commercial success. Even if we succeed in developing and commercializing one or more of our product candidates, we may never achieve sufficient sales revenue to achieve or maintain profitability. Accordingly, we will need to continue to rely on additional financing to achieve our business objectives. Adequate additional financing may not be available to us on acceptable terms, or at all.
Raising additional capital may cause dilution to our stockholders, restrict our operations or require us to relinquish rights to our technologies or product candidates.
Until such time, if ever, as we can generate substantial product revenue, we expect to finance our cash needs through a combination of equity offerings, debt financings, collaborations, strategic alliances and licensing arrangements. We do not have any committed external source of funds, other than our collaborations, which are limited in scope and duration. To the extent

that we raise additional capital through the sale of equity or convertible debt securities, ownership interests will be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect the rights of our common stockholders. Debt financing, if available, may require us to enter into agreements that include covenants limiting or restricting our ability to take specific actions, such as incurring additional debt, making capital expenditures or declaring dividends. In addition, securing financing could require a substantial amount of time and attention from our management and may divert a disproportionate amount of their attention away from day-to-day activities, which may adversely affect our management’s ability to oversee the development of our product candidates.
If we raise funds through additional collaborations, strategic alliances or licensing arrangements with third parties, we may have to relinquish valuable rights to our technologies, future revenue streams, research programs or product candidates or to grant licenses on terms that may not be favorable to us.
Our short operating history may make it difficult for you to evaluate the success of our business to date and to assess our future viability.
We were founded in the second half of 2007 and commenced operations in late 2008. Our operations to date have been limited to organizing and staffing our company, business planning, raising capital, acquiring and developing our technology, identifying potential product candidates, undertaking preclinical and clinical studies of our product candidates, and establishing a commercial infrastructure. All of our product candidates are still in preclinical and clinical development, with the exception of IDHIFA®. We have not yet demonstrated our ability to successfully complete any large-scale or pivotal clinical trials, obtain other marketing approvals for our product candidates, manufacture a commercial scale medicine, or arrange for a third party to do so on our behalf, or conduct sales and marketing activities necessary for successful commercialization. Typically, it takes about 10 to 15 years to develop one new medicine from the time it is discovered to when it is available for treating patients, assuming that it successfully completes all stages of research and development and achieves marketing approval, all of which is highly uncertain. Consequently, any predictions you make about our future success or viability may not be as accurate as they could be if we had a longer operating history.
We may encounter unforeseen expenses, difficulties, complications, delays and other known and unknown factors that may adversely affect our ability to successfully commercialize our product candidates. We will need to transition from a company with a research focus to a company capable of supporting commercial activities. We may not be successful in such a transition.
We expect our financial condition and operating results to continue to fluctuate significantly from quarter to quarter and year to year due to a variety of factors, many of which are beyond our control. Accordingly, you should not rely upon the results of any quarterly or annual periods as indications of future operating performance.
Risks Related to the Discovery, Development, and Commercialization of our Products and Product Candidates
We do not know whether we will be able to develop any medicines of commercial value, based on our approach to the discovery and development of product candidates that target cellular metabolism.
Our scientific approach focuses on using our proprietary technology to identify key metabolic enzymes in cancer, rare genetic diseases, or RGDs, or other diseased cells in the laboratory and then using these key enzymes to screen for and identify product candidates targeting cellular metabolism. We are also focused on metabolic immuno-oncology, an emerging field of cancer research focused on altering the metabolic state of immune cells to enhance the body’s immune response to cancer.
Our focus on using our proprietary technology to screen for and identify product candidates targeting cellular metabolism may not result in the discovery and development of commercially viable medicines to treat cancer or RGDs. Any medicines that we develop may not effectively correct metabolic pathways or alter the metabolic state of immune cells. If we are able to develop a product candidate that targets cellular metabolism in preclinical studies, we may not succeed in demonstrating safety and efficacy of the product candidate in human clinical trials. In addition, even if we obtain marketing approval for one of our product candidates, we can provide no assurance that commercialization of such product candidate will be successful.
We are reliant on Celgene for the successful development and commercialization of IDHIFA®. If Celgene doesdo not successfully commercialize IDHIFA®PYRUKYND® and other products for the treatment of adult patients with R/R AML and an IDH2 mutation,which we receive approval, our future prospects may be substantially harmed.
In August 2017,February 2022, we obtained marketing approval from the FDA approved IDHIFA®for PYRUKYND® (mitapivat) for the treatment of hemolytic anemia in adults with PK deficiency in the United States. In November 2022, we received marketing authorization from the European Commission for PYRUKYND® for the treatment of PK deficiency in adult patients with R/R AMLin the EU and an IDH2 mutation, onin December 2022 we received marketing authorization in Great Britain for PYRUKYND® for the basistreatment of an NDA submitted by Celgene. Although IDHIFA®PK deficiency in adult patients under the European Commission Decision Reliance Procedure. PYRUKYND® is the first product in our rare disease portfolio that has received FDAmarketing approval and is our first product following the sale of our oncology business to Servier in R/R AML with an IDH2 mutation, we and Celgene are still evaluating IDHIFA® in other clinical trials. Celgene maintains worldwide development and commercial rights to IDHIFA® and Celgene will fund the development and commercialization costs related to this program, although we have certain co-commercialization and co-promotion rights to IDHIFA®. Under the 2010 Agreement, Celgene is responsible for all development costs for IDHIFA®, and we are eligible to receive up to $95.0 million in milestone payments and a tiered royalty on any net sales of products containing IDHIFA®. Thus, ourMarch 2021. Our ability to generate productmeaningful revenue from IDHIFA®PYRUKYND® will depend heavily on Celegene’sour successful development and eventual commercialization of the product.

In connection with our regulatory approvals in the EU and Great Britain, we are currently providing access to PYRUKYND® free of charge for eligible patients in those jurisdictions through a global managed access program.
The development and commercialization of IDHIFA®PYRUKYND® could be unsuccessful if:
IDHIFA® becomes no longer acceptedthe medical community and third-party payors do not accept PYRUKYND® as safe, efficacious and cost-effective for the treatment of adult patientsadults with R/R AML and an IDH2 mutationPK deficiency in the medical community and by third-party payors;approved jurisdictions;
Celgene failswe fail to continue to applymaintain the necessary financial resources and expertise to manufacturing, marketingmanufacture, market and selling IDHIFA®sell PYRUKYND®;
Celgene does not continuewe fail to develop, implement and implementmaintain effective marketing, sales and distribution strategies and operations for the development and commercialization of IDHIFA®PYRUKYND®;
Celgene does notwe fail to continue to develop, validate and maintain a commercially viable manufacturing process for IDHIFA®PYRUKYND® that is compliant with current good manufacturing practices;practices, or cGMP;
Celgene do notwe fail to successfully obtain third party reimbursement and generate commercial demand that results in expected sales of IDHIFA®PYRUKYND®;
PYRUKYND® may become subject to unfavorable pricing regulations and third-party reimbursement practices;
we or Celgene encounter any third partythird-party patent interference, derivation, inter partes review, post-grant review, reexamination or patent infringement claims with respect to IDHIFA®PYRUKYND®;
Celgene does notwe fail to comply with regulatory and legal requirements applicable to the sale of IDHIFA®PYRUKYND®;
competing drug products are approved for the same indications as IDHIFA®PYRUKYND®;
newsignificant safety, manufacturing and/or quality risks are identified;
IDHIFA®PYRUKYND® fails to gain and/or maintain sufficient market acceptance by physicians, patients, healthcare payors and others in the medical community;
a significant number of eligible patients with PK deficiency are not prescribed PYRUKYND® and, if they are, such patients do not stay on treatment; or
PYRUKYND® does not demonstrate acceptable safety and efficacy in current or future clinical trials, or otherwise does not meet applicable regulatory standards for approval in indications other than for the treatment of adult patients with R/R AML and an IDH2 mutation;
Celgene determines to re-prioritize its commercial or development programs and reduce or terminate its efforts on the development or commercialization of IDHIFA®; or
Celgene does not maintain or defend intellectual property rights associated with IDHIFA®.indications.
If we or Celgene experience significant delays or an inability to successfully develop and commercialize IDHIFA®,PYRUKYND® our business would be materially harmed.
We may not be successful in our efforts to identify or discover potential product candidates.
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A key element
the research methodology used may not be successful in identifying appropriate biomarkers or potential product candidates; or
potential product candidates may, on further study, be shown to have harmful side effects or other characteristics that indicate that they are unlikely to be medicines that will receive marketing approval and achieve market acceptance.
Research programs to identify new product candidates require substantial technical, financial and human resources. We may choose to focus our efforts and resources on a potential product candidate that ultimately proves to be unsuccessful.
If we are unable to identify suitable compounds for preclinical and clinical development, we will not be able to obtain product revenue in future periods, which likely would result in significant harm to our financial position and adversely impact our stock price.
We depend heavily on the success of our most advancedclinical-stage product candidates, which are stillincluding the potential approval of PYRUKYND® for use in clinical development.indications other than PK deficiency and in other jurisdictions. Clinical trials of our product candidates may not be successful.successful for a number of important reasons. If we or our collaborators are unable to commercialize our product candidates or experience significant delays in doing so, our business will be materially harmed.
We have invested a significant portion of our efforts and financial resources in the identification of our product candidates and the development of our most advanced clinical product candidates, which are ivosidenib and AG-881 for the treatment of hematological and solid tumors and AG-348 for the

treatment of pyruvate kinase, or PK, deficiency. We have initiated clinical trials for these product candidates. In December 2017, we submitted an NDA to the FDA for ivosidenib for the treatment of patients with R/R AML and an IDH1 mutation. We also plan to submit a Marketing Authorization Application, or MAA, to the European Medicines Agency, or EMA, for ivosidenib for IDH1 mutant-positive R/R AML in the fourth quarter of 2018. In addition, we intend to initiate two global, pivotal trials of AG-348 in PK deficiency in the first half of 2018, and we also expect to initiate a phase 2 proof of concept trial of AG-348 in thalassemia in the fourth quarter of 2018. Our next most advanced cancer product candidate is AG-270. We submitted an investigational new drug application, or IND, for AG-270 in November 2017 and, in December 2017, the FDA concluded that we may proceed with a proposed phase 1 dose-escalation trial in multiple tumor types carrying a methylthioadenosine phosphorylase deletion, which we expect to initiate in the first quarter of 2018. We have not commenced clinical trials for any of our other product candidates.programs, including PYRUKYND®. Our ability to generate meaningful product revenue will depend heavily on the successful clinical development and eventual commercialization of our product candidates.
The success of ivosidenibcurrent and our otherany future product candidates, including PYRUKYND®. While we obtained marketing approval of PYRUKYND® for the treatment of hemolytic anemia in adults with PK deficiency in the United States and marketing authorization of PYRUKYND® for the treatment of adults with PK deficiency in the EU and Great Britain, we cannot be certain that we will depend on many factors, including the following:
successful enrollmentobtain marketing approval of PYRUKYND® in and completion of, clinical trials;
safety, tolerability and efficacy profiles that are satisfactory to the FDA, the EMA or any comparable foreign regulatory authority for marketing approval;
timely receipt of marketing approvals from applicable regulatory authorities;
establishing both clinical and commercial manufacturing capabilities or making arrangements with third-party manufacturers;
the performance of any collaborators;
obtaining and maintaining patent and trade secret protection and non-patent exclusivity for our medicines;
launching commercial sales of the medicines, if and when approved, whether aloneindications other than PK deficiency or in collaboration with others;
acceptance of the medicines, if and when approved, by patients, the medical community and third-party payors;
effectively competing with other therapies;
continuing acceptable safety profile for the medicines following approval;
enforcing and defending intellectual property rights and claims; and
achieving desirable medicinal properties for the intended indications.
Many of these factors are beyond our control, including clinical development, the regulatory submission process, potential threats to our intellectual property rights and the manufacturing, marketing and sales efforts of any collaborator. If we or any collaborators do not achieve one or more of these factors in a timely manner or at all, we or such collaborators could experience significant delays or an inability to successfully commercialize our most advanced product candidates, which would materially harm our business.
If clinical trials of our product candidates fail to demonstrate safety and efficacy to the satisfaction of regulatory authorities or do not otherwise produce positive results, we may incur additional costs or experience delays in completing, or ultimately be unable to complete, the development and commercialization of our product candidates.jurisdictions.
We, and any collaborators, are not permitted to commercialize, market, promote or sell any product candidate in the United States without obtaining marketing approval from the FDA. Foreign regulatory authorities, such as the EMA, impose similar requirements. We have not previously submitted similar drug approval filings to comparablerequirements in foreign regulatory authorities for any of our product candidates.jurisdictions. Before obtaining marketing approval from regulatory authorities for the sale of our product candidates, we must complete preclinical development and then conduct extensive clinical trials to demonstrate the safety and efficacy of our product candidates in humans. In December 2017, we submitted an NDA to the FDA for ivosidenib in IDH1 mutant-positive R/R AML, and we plan to submit an MAA to the EMA for ivosidenib for IDH1 mutant-positive R/R AML in the fourth quarter of 2018. However, we can provide no assurance that we will receive regulatory approval of ivosidenib on the timeframe we expect, or at all.
Clinical testing is expensive, difficult to design and implement, can take many years to complete and is uncertain as to outcome. We cannot guarantee that any clinical trials will be conducted as planned or completed on schedule, if at all. The clinical development of our product candidates is susceptible to the risk of failure inherent at any stage of product development, including failuredevelopment. Moreover, we, or any collaborators, may experience any of a number of possible unforeseen adverse events in connection with clinical trials, many of which are beyond our control, including:
we, or our collaborators, may fail to demonstrate efficacy in a clinical trial or across a broad population of patients, the occurrence of adverse events that are severe or medically or commercially unacceptable, failure to comply with protocols or applicable regulatory requirements and determination by the FDA or any comparable foreign regulatory authority that a product candidate may notpatients;

continue development or is not approvable. For instance, in December 2016, we withdrew our IND for AG-519, our second PKR activator, following verbal notification of a clinical hold from the FDA relating to a previously disclosed case of drug-induced cholestatic hepatitis which occurred in our phase 1 clinical trial of AG-519 in healthy volunteers. Although these decisions and this hepatic adverse event finding do not affect our ongoing global phase 2 clinical trial, also known as DRIVE PK, for AG-348, our first PKR activator, we cannot provide any assurances that there will not be similar or other treatment-related severe adverse events in DRIVE PK or our other clinical trials, that our other trials will not be placed on clinical hold in the future, or that patient recruitment for DRIVE PK or our other trials will not be adversely impacted.
Itit is possible that even if one or more of our product candidates has a beneficial effect, that effect will not be detected during clinical evaluation as a result of one or more of a variety of factors, including the size, duration, design, measurements, conduct or analysis of our clinical trials. Conversely, as a result of the same factors, our clinical trials may indicate an apparent positive effect of a product candidate that is greater than the actual positive effect, if any. Similarly,For example, many compounds that initially showed promise in our clinical trials we may failearlier stage testing for treating specific indications have later been found to detect toxicitycause side effects that prevented further development of or intolerability caused by the compound;
our product candidates or mistakenly believe that our product candidates are toxic or not well-tolerated when that is not in fact the case.
Any inability to successfully complete preclinical and clinical development could result in additional costs to us, or any future collaborators, and impair our ability to generate revenue from product sales, regulatory and commercialization milestones and royalties. Moreover, if we or our collaborators are required to conduct additional clinical trialsmay have undesirable side effects or other testing of our product candidates beyond those that we currently contemplate, if weunexpected characteristics or our collaborators are unableotherwise expose participants to successfully complete clinical trials of our product candidates or other testing, if the results of these trials or tests are not positive or are only modestly positive or if there are safety concerns, we or our collaborators may:
be delayed in obtaining marketing approval for our product candidates;
not obtain marketing approval at all;
obtain approval for indications or patient populations that are not as broad as intended or desired;
obtain approval with labeling that includes significant use or distribution restrictions or safety warnings, including boxed warnings;
be subject to additional post-marketing testing requirements; or
have the medicine removed from the market after obtaining marketing approval.
Our failure to successfully complete clinical trials of our product candidates and to demonstrate the efficacy and safety necessary to obtain regulatory approval to market any of our product candidates would significantly harm our business.
If we, or any collaborators, experience any of a number of possible unforeseen events in connection with clinical trials of our product candidates, potential clinical development, marketing approval or commercialization of our product candidates could be delayed or prevented.
We or our collaborators may experience numerous unforeseen events during, or as a result of, clinical trials that could delay or prevent our ability to receive marketing approval or commercialize our product candidates, including:
regulators or institutional review boards may not authorizeunacceptable health risks, causing us, our collaborators or our investigators, regulators or institutional review boards or the data safety monitoring board for such trial to commencehalt, delay, interrupt, suspend or terminate the trials or cause us, or any collaborators, to abandon development or limit development of that product candidate to certain uses or subpopulations in which the undesirable side effects or other characteristics are less prevalent, less severe or more acceptable from a clinical trialrisk-benefit perspective;
if our product candidates have undesirable side effects, it could result in a more restrictive label, or conduct a clinical trial at a prospective trial site;it could result in the delay or denial of marketing approval by the FDA or comparable foreign regulatory authorities;
we or our collaborators may have delays in reaching or fail to reach agreement on acceptable clinical trial contracts or clinical trial protocols with prospective trial sites;
clinical trials of our product candidates may produce negative or inconclusive results, and we, or our collaborators, may decide, or regulators may require us, to conduct additional clinical trials, including testing in more subjects, or abandon product development programs;
regulators or institutional review boards may not authorize us, our collaborators or our investigators to commence a clinical trial or conduct a clinical trial at a prospective trial site;
we or our collaborators may have delays in reaching or fail to reach agreement on acceptable clinical trial contracts or clinical trial protocols with prospective trial sites;
the number of patients required for clinical trials of our product candidates may be larger than we anticipate; enrollment in these clinical trials, which may be particularly challenging for some of the orphan diseases we target in our RGDrare disease programs, may be slower than we anticipate; or participants may drop out of these clinical trials at a higher rate than we anticipate;
third-party contractors used by us or our collaborators may fail to comply with regulatory requirements or meet their contractual obligations in a timely manner, or at all;
we or our collaborators might have to suspend or terminate clinical trials of our product candidates for various reasons, including a finding that the participants are being exposed to unacceptable health risks;
regulators, institutional review boards, or the data safety monitoring board for such trials may require that we, our collaborators or our investigators suspend or terminate clinical research for various reasons, including

noncompliance with regulatory requirements or a finding that the participants are being exposed to unacceptable health risks;
the cost of clinical trials of our product candidates may be greater than anticipated;
the supply or quality of our product candidates or other materials necessary to conduct clinical trials of our product candidates may be insufficient or inadequate; and
our product candidates may have undesirable side effects or other unexpected characteristics, causing us, our collaborators or our investigators, regulators or institutional review boards to suspend or terminate the trials.
Product development costs for us, or any collaborators, will increase if we, or they, experience delays in testing or pursuing marketing approvals and we, or they, may be required to obtain additional funds to complete clinical trials and prepare for possible commercialization of our product candidates. We do not know whether any preclinical tests or clinical trials will begin as planned, will need to be restructured, or will be completed on schedule or at all. Significantsignificant preclinical study or clinical trial delays also could shorten any periods during which we, or any future collaborators, may have the exclusive right to commercialize our product candidates or allow our competitors, or the competitors of any collaborators, to bring products to market before we, or any collaborators, do;
the cost of clinical trials of our product candidates may be greater than anticipated; and
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the supply or quality of our product candidates or other materials necessary to conduct clinical trials of our product candidates may be insufficient or inadequate.
In December 2016, we withdrew our IND for AG-519, our second PK activator, following verbal notification of a clinical hold from the FDA relating to a previously disclosed case of drug-induced cholestatic hepatitis which occurred in our phase 1 clinical trial of AG-519 in healthy volunteers. Although these decisions and this hepatic adverse event finding do and impairnot affect our ability,ongoing clinical trials for PYRUKYND®, our first PK activator, we cannot provide any assurances that there will not be other treatment-related severe adverse events in our other clinical trials, or that our other trials will not be placed on clinical hold in the ability of any collaborators,future.
Our failure to successfully commercializebegin and complete clinical trials of our product candidates and may harm our businessto demonstrate the efficacy and results of operations. In addition, many of the factors that leadsafety necessary to clinical trial delays may ultimately leadobtain regulatory approval to the denial of marketing approval ofmarket any of our product candidates could result in additional costs to us, or any collaborators, would impair our ability to generate revenue from product sales, regulatory and commercialization milestones and royalties and would significantly harm our business.

We may engage in in-licensing transactions or acquisitions that could disrupt our business, cause dilution to our stockholders or reduce our financial resources.
We have and may in the future enter into additional transactions to in-license products, technologies or assets or to acquire other products, technologies, assets or businesses. As part of the evolution of our research organization, we plan to prioritize in-licensing or acquiring assets for future pipeline growth. For example, in July 2023, we entered into a license agreement with Alnylam for the development and commercialization of products containing or comprised of an siRNA development candidate discovered by Alnylam and targeting the TMPRSS6 gene, and we intend to pursue development of a licensed product for the potential treatment of PV.
Our ability to successfully in-license or acquire assets and develop product candidates following such transactions is unproven. If we do identify additional suitable candidates or assets for in-licensing transactions or acquisitions, we may not be able to make such transactions on favorable terms, or at all. Such transactions may require us to relinquish rights to develop product candidates in certain indications, limit our ability to pursue certain targets or require us to make significant milestone or royalty payments to third parties upon achievement of certain events. For example, we are responsible to pay up to $130.0 million in potential development and regulatory milestones, in addition to sales milestones as well as tiered royalties on annual net sales, if any, of any licensed products, under the license agreement with Alnylam. Further, any in-licensing transaction or acquisitions we undertake may not strengthen our competitive position, and these transactions may be viewed negatively by customers or investors. We may decide to incur debt in connection with an acquisition or an in-licensing transaction or issue our common stock or other equity securities to the stockholders of the counterparty, which would reduce the percentage ownership of our existing stockholders. We could incur losses resulting from undiscovered liabilities of the acquired business, product or technology that are not covered by the indemnification we may obtain from the seller. In addition, we may not be able to successfully integrate the acquired personnel, technologies and operations into our existing business in an effective, timely and non-disruptive manner. Such transactions may also divert management attention from day-to-day responsibilities, increase our expenses and reduce our cash available for operations and other uses. We cannot ensure that following any transaction we would achieve the expected synergies to justify the transactions. We cannot predict the number, timing or size of future transactions or the effect that any such transactions might have on our operating results.

Public health epidemics or pandemics may affect our ability to initiate or continue our planned, ongoing and future preclinical studies and clinical trials, disrupt regulatory activities, disrupt our ability to maintain a commercial infrastructure for our product or have other adverse effects on our business and operations.
Public health emergencies or pandemics could adversely affect our business, financial condition, results of operations, and prospects. We may face delays, disruptions or shortages as a result of such pandemics that may affect our ability to initiate and complete preclinical studies and clinical trials or impact our commercialization efforts. We have experienced disruptions to certain clinical and research activities at our contract research organizations, or CROs, due to the recent COVID-19 pandemic. Any future pandemic or public health emergency could result in site initiation, participant recruitment and enrollment, participant dosing, distribution of clinical trial materials, study monitoring and data analysis being paused or delayed due to changes in hospital or university policies, federal, state or local regulations, diversion of hospital resources or other reasons related to a public health emergency. If a pandemic or public health emergency arises in the future, we may face difficulties recruiting or retaining patients in our ongoing clinical trials, and patients enrolled in our clinical trials may be unable or unwilling to visit clinical trial sites which may impact the collection of important clinical trial data and may necessitate remote data verification. In addition, limitations on the ability to visit sites may affect our enrollment timelines for our clinical trials, and may adversely affect the timing of completion of our clinical trials or our ability to complete clinical trials in a fully compliant manner. Additionally, the potential suspension of clinical trial activity at clinical trial sites or reduced availability of CRO personnel may have an adverse impact on our clinical trial plans and timelines.
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The public health emergency declarations related to COVID-19 ended on May 11, 2023. The FDA ended a number of COVID-19 related policies and retained a number of COVID-19 related policies. It is unclear how, if at all, these developments will impact our efforts to develop and commercialize our product candidates.
We cannot be certain what the overall impact of future health emergencies or pandemics will be on our business.

If we experience delays or difficulties in the enrollment of patients in clinical trials, our receipt of necessary regulatory approvals could be delayed or prevented.
We or our collaborators may not be able to initiate, continue or continuecomplete clinical trials for our product candidates if we or they are unable to locate and enroll a sufficient number of eligible patients to participate in these trials as required by the FDA or analogous regulatory authorities outside the United States. Enrollment may beFurthermore, enrollment had previously been particularly challenging for somein light of the orphan diseases we target in our RGD programs. In addition, some of our competitors may have ongoing clinical trials for product candidates that would treat the same indications as our product candidates, and patients who would otherwise be eligible for our clinical trials may instead enroll in clinical trials of our competitors’ product candidates.recent COVID-19 pandemic.
Patient enrollment is also affected by other factors including:
prevalence and severity of the disease under investigation;
availability and efficacy of approved medications for the disease under investigation;
eligibility criteria for the study in question;
perceived risks and benefits of the product candidate under study;
efforts to facilitate timely enrollment in clinical trials;
patient referral practices of physicians;
the ability to monitor patients adequately during and after treatment; and
proximity and availability of clinical trial sites for prospective patients.
Utilizing our precision medicine approach, we generally focus our development activities on genetically or biomarker defined patients most likely to respond to our therapies. As a result, the potential patient populations for our clinical trials are narrowed, and we may experience difficulties in identifying and enrolling a sufficient number of patients in our clinical trials.
In particular,December 2022, with the successful completionpassage of ourthe Food and Drug Omnibus Reform Act, Congress required sponsors to develop and submit a diversity action plan for each phase 3 clinical development program for AG-348 for the treatmenttrial or any other "pivotal study" of PK deficiency is dependent upona new drug product. These plans are meant to encourage enrollment of more diverse patient populations in late-stage clinical trials of FDA-regulated products. If we are not able to adhere to these new requirements, our ability to enroll a sufficient numberconduct clinical trials may be delayed or halted.
In addition, some of our competitors may have ongoing or planned clinical trials for product candidates that would treat the same indications as our product candidates, and patients with PK deficiency. PK deficiency is a rare disease with a small patient population. Further, there are only a limited number of specialist physicians that regularly treat patients with PK deficiency and major clinical centers that support PK deficiency are concentrated in a few geographic regions. The small population of patients, the nature of the disease and limited trial sites may make it difficultwho would otherwise be eligible for us to enroll enough patients to complete our clinical trials for AG-348 for PK deficiencymay instead enroll in a timely and cost-effective manner.
In addition, other companies are conducting clinical trials or may in the future conduct clinical trials, which may have similar eligibility criteria asof our current or future clinical trials.competitors’ product candidates. For example, Daiichi Sankyo Company, Ltd., with DS-1001b, Bayer AG, or Bayer, with BAY1436032, and Forma Therapeutics Holdings, LLC, with FT-2102, are currently conducting clinical trials in patients with IDH1 mutant positive-cancers, and Rocket Pharma LTD is in the preclinical stages of development fordeveloping a gene therapy targeting PK deficiency. As these companiesdeficiency; Novo Nordisk is developing molecules for the treatment of alpha and others initiatebeta thalassemia, SCD and conduct clinical trials,LR MDS; Pfizer is developing molecules for the treatment of SCD; Fulcrum Therapeutics Inc., or Fulcrum, is developing a treatment for SCD; Geron Corporation, or Geron, is developing imetelstat for the treatment of LR MDS (for which they may competehave a Prescription Drug User Fee Act goal date of June 16, 2024 for eligible patients with our clinical trialstheir new drug application); Keros Therapeutics, or Keros, is developing KER-050 for the treatment of ivosidenib, AG-881anemia in LR MDS; PTC Therapeutics, Inc., or AG-348.PTC, and Jnana Therapeutics, Inc., or Jnana, and Homology Medicines Inc., or Homology, are developing therapies to treat PKU; and Protagonist Therapeutics, or Protagonist, Ionis Pharmaceuticals, Inc., or Ionis, Silence Therapeutics, or Silence, and Merck are developing therapies to treat PV. Competition for theseeligible patients may make it particularly difficult for us to enroll enougha sufficient number of patients to complete our clinical trials for ivosidenib, AG-881 or AG-348our product candidates in a timely and cost-effective manner.

In addition, we have a small number of clinical trial sites for certain clinical trials in the Middle East, including in Lebanon and Israel, that could be affected by the current armed conflict in Israel and the Gaza Strip.
Furthermore, weWe rely on contract research organizations, or CROs and clinical trial sites to ensure the proper and timely conduct of our clinical trials and while we have agreements governing their committed activities, we have limited influence over their actual performance. Our or our collaborators’ inability to enroll a sufficient number of patients for our clinical trials would result in significant delays or may require us to abandon one or more clinical trials altogether. Enrollment delays in our clinical trials mayaltogether, or result in increased development costs for our product candidates, which would cause the value of our company to decline and limit our ability to obtain additional financing.
If serious adverse side effects or unexpected characteristics are identified during the development of our product candidates, we may need to abandon or limit our development of some of our product candidates.
With the exception of IDHIFA®, all of our most advanced product candidates are still in clinical stage development and their risk of failure is high. It is impossible to predict when or if any of our product candidates will prove effective or safe in humans or will receive marketing approval. Adverse events or undesirable side effects caused by, or other unexpected properties of, our product candidates could cause us, any future collaborators, an institutional review board or regulatory authorities to interrupt, delay or halt clinical trials of one or more of our product candidates and could result in a more restrictive label, or the delay or denial of marketing approval by the FDA or comparable foreign regulatory authorities. If adverse effects were to arise in patients being treated with any of our product candidates, it could require us to halt, delay or interrupt clinical trials of such product candidate or adversely affect our ability to obtain requisite approvals to advance the development and commercialization of such product candidate. If any of our product candidates is associated with adverse events or undesirable side effects or has properties that are unexpected, we, or any future collaborators, may need to abandon development or limit development of that product candidate to certain uses or subpopulations in which the undesirable side effects or other characteristics are less prevalent, less severe or more acceptable from a risk-benefit perspective. Many compounds that initially showed promise in earlier stage testing for treating cancer, RGDs or other diseases have later been found to cause side effects that prevented further development of the compound. For instance, in December 2016, we withdrew our IND for AG-519, our second PKR activator, following verbal notification of a clinical hold from the FDA relating to a previously disclosed case of drug-induced cholestatic hepatitis which occurred in our phase 1 clinical trial of AG-519 in healthy volunteers. Although these decisions and this hepatic adverse event finding do not affect our ongoing global phase 2 clinical trial (DRIVE PK) for AG-348, our first PKR activator, we cannot provide any assurances that there will not be similar or other treatment-related severe adverse events in DRIVE PK or our other clinical trials, that our other trials will not be placed on clinical hold in the future, or that patient recruitment for DRIVE PK or our other trials will not be adversely impacted.
Results of preclinical studies and early clinical trials may not be predictive of results of futurelater-stage clinical trials.
The outcome of preclinical studies and early clinical trials may not be predictive of the success of later clinical trials, and interim results of clinical trials do not necessarily predict success in future clinical trials. Many companies in the pharmaceutical
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and biotechnology industries have suffered significant setbacks in late-stage clinical trials after achieving positive results in earlier stages of development, and we could face similar setbacks. The design of a clinical trial can determine whether its results will support approval of a product and flaws in the design of a clinical trial may not become apparent until the clinical trial is well advanced. We have limited experience in designing clinical trials and may be unable to design and execute a clinical trial to support marketing approval. In addition, preclinical and clinical data are often susceptible to varying interpretations and analyses. Many companies that believed their product candidates performed satisfactorily in preclinical studies and clinical trials have nonetheless failed to obtain marketing approval for the product candidates. Even if we, or futureany collaborators, believe that the results of clinical trials for our product candidates warrant marketing approval, the FDA or comparable foreign regulatory authorities may disagree and may not grant marketing approval of our product candidates.
In some instances, there can be significant variability in safety or efficacy results between different clinical trials of the same product candidate due to numerous factors, including changes in trial procedures set forth in protocols, differences in the size and type of the patient populations, changes in and adherence to the dosing regimen and other clinical trial protocols and the rate of dropout among clinical trial participants. While we obtained marketing approval of PYRUKYND® for the treatment of hemolytic anemia in adults with PK deficiency in the United States and marketing authorization of PYRUKYND® for the treatment of adults with PK deficiency in the EU and Great Britain, we cannot be certain that we will obtain marketing approval of PYRUKYND® in other indications. The results of clinical trials of PYRUKYND® for the treatment of PK deficiency do not predict that PYRUKYND® will be efficacious in our ongoing clinical trials in other indications, such as thalassemia or SCD. If we fail to receive positive results in clinical trials of our product candidates, the development timeline and regulatory approval and commercialization prospects for our most advanced product candidates, and, correspondingly, our business and financial prospects would be negatively impacted.

We may expend our limited resources to pursue a particular product candidate or indication and fail to capitalize on product candidates or indications that may be more profitable or for which there is a greater likelihood of success.
Because we have limited financial and managerial resources, we focus on research programs and product candidates that we identify for specific indications. As a result, we may forego or delay pursuit of opportunities with other product candidates or for other indications that later prove to have greater commercial potential. We have decided to evolve our approach to exploratory research and drug discovery to prioritize investment in advancing our late lead-optimization research, while continuing to progress our registration-enabling clinical programs in thalassemia, SCD and pediatric PK deficiency, our phase 2a trial in LR MDS, our IND-enabling studies for AG-181, our PAH stabilizer for the potential treatment of PKU, and our development of a licensed siRNA development candidate under our license agreement with Alnylam. Our resource allocation decisions may cause us to fail to capitalize on viable commercial medicines or profitable market opportunities. Our spending on current and future research and development programs and product candidates for specific indications may not yield any commercially viable medicines. If we do not accurately evaluate the commercial potential or target market for a particular product candidate, we may relinquish valuable rights to that product candidate through collaboration, licensing or other royalty arrangements in cases

in which it would have been more advantageous for us to retain sole development and commercialization rights to such product candidate.
If we are unable to successfully develop companion diagnostics for our product candidates, or experience significant delays in doing so, we may not realize the full commercial potential of our therapeutics.
Because we are focused on precision medicine, in which predictive biomarkers will be used to identify the right patients for our drug candidates, we believe that our success will depend, in part, on our ability to develop companion diagnostics, which are assays or tests to identify an appropriate patient population for these drug candidates. There has been limited success to date industry-wide in developing these types of companion diagnostics. To be successful, we need to address a number of scientific, technical and logistical challenges. We have little experience in the development of diagnostics and may not be successful in developing appropriate diagnostics to pair with any of our therapeutic product candidates that receive marketing approval. Companion diagnostics are subject to regulation by the FDA and similar regulatory authorities outside the United States as medical devices and require separate regulatory approval prior to commercialization. Given our limited experience in developing diagnostics, we rely and expect to continue to rely in part or in whole on third parties for their design and manufacture. We also depend on Celgene for the development of companion diagnostics for some of our cancer therapeutic product candidates, including the FDA approved companion diagnostic for IDHIFA®. If any parties, including without limitation Celgene or us, or any third parties engaged by Celgene or us are unable to successfully develop companion diagnostics for our therapeutic product candidates, or experience delays in doing so:
the development of our therapeutic product candidates may be adversely affected if we are unable to appropriately select patients for enrollment in our clinical trials;
our therapeutic product candidates may not receive marketing approval if safe and effective use of a therapeutic product candidate depends on an in vitro diagnostic; and
we may not realize the full commercial potential of any therapeutics that receive marketing approval if, among other reasons, we are unable to appropriately select patients who are likely to benefit from therapy with our medicines.
As a result of any of these events, our business would be harmed, possibly materially.
We may be unable to obtain, or may be delayed in obtaining, marketing approval for our product candidates.
In December 2017, we submitted an NDA to the FDA for ivosidenib in IDH1 mutant-positive R/R AML, and we plan to submit an MAA to the EMA for ivosidenib for IDH1 mutant-positive R/R AML in the fourth quarter of 2018. It is possible that the FDA or EMA may refuse to accept our applications for substantive review, or that the FDA or EMA may conclude after review of our data that our application is insufficient to obtain marketing approval of ivosidenib in the United States and the European Union, or E.U., respectively. If the FDA or EMA does not accept or approve our NDA for ivosidenib or the MAA for ivosidenib that we plan to submit, respectively, we may be required to conduct additional clinical trials, preclinical studies or manufacturing validation studies and submit that data to regulators before our application will be reconsidered. Depending on the extent of these or any other FDA- or EMA-required trials or studies, acceptance or approval of our NDA for ivosidenib or the MAA for ivosidenib that we plan to submit may be delayed by several years, or may require us to expend more resources than we have available. It is also possible that additional trials or studies, if performed and completed, may not be considered sufficient by the FDA or EMA to accept or approve our NDA for ivosidenib or the MAA for ivosidenib that we play to submit, respectively. Any delay in obtaining, or an inability to obtain, marketing approvals would prevent us from commercializing ivosidenib in the United States and/or abroad, generating revenue and achieving and sustaining profitability. If any of these outcomes occur, either to ivosidenib or to any future product candidate for which we may seek marketing approval, we may be forced to abandon our development efforts for ivosidenib or such future product candidates, which could significantly harm our business.
Even if any of our product candidates receives marketing approval, we or others may later discover that PYRUKYND®, or any of our product candidates that may receive marketing approval in the productfuture, is less effective than previously believed or causes undesirable side effects that were not previously identified, which could compromise our ability, or that of any future collaborators, to market the product.
Clinical trials of our product candidates are conducted in carefully defined sets of patients who have agreed to enter into clinical trials. Consequently, itIt is possible that our clinical trials, or those of any future collaborator,collaborators, may indicate an apparent positive effect of a product candidate that is greater than the actual positive effect, if any, or alternatively fail to identify undesirable side effects. If, following approval of a product candidate, including PYRUKYND®, we, or others, discover that the product is less effective than previously believed or causes undesirable side effects that were not previously identified, any of the following adverse events could occur:
regulatory authorities may withdraw their approval of the product or seize the product;

we, or any future collaborators, may be required to recall the product, change the way the product is administered or conduct additional clinical trials;
additional restrictions may be imposed on the marketing of, or the manufacturing processes for, the particular product;
we may be subject to fines, injunctions or the imposition of civil or criminal penalties;
regulatory authorities may require the addition of labeling statements, such as a “black box” warning or a contraindication, including, for example, the black box warning for differentiation syndrome on the label for IDHIFA®;statements;
we, or any future collaborators, may be required to create a Medication Guide outlining the risks of the previously unidentified side effects for distribution to patients;
we, or any future collaborators, could be sued and held liable for harm caused to patients;
the product may become less competitive; and
our reputation may suffer.
Even if
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PYRUKYND®, or any of our product candidates that may receive marketing approval theyin the future, may fail to achieve the degree of market acceptance by physicians, patients, healthcare payors and others in the medical community necessary for commercial success.
IDHIFA®PYRUKYND®, or any of our product candidates that may receive marketing approval in the future, may nonetheless fail to gain and/or maintain sufficient market acceptance by physicians, patients, healthcare payors and others in the medical community. For example, current cancer treatments like chemotherapy and radiation therapy are well established in the medical community, and doctors may continue to rely on these treatments. If PYRUKYND® or any of our product candidates that may receive marketing approval do not achieve an adequate level of acceptance, we may not generate significant product revenue and we may not become profitable. The degree of market acceptance of PYRUKYND® and any of our product candidates, if approved for commercial sale, will depend on a number of factors, including:
efficacy and potential advantages compared to alternative treatments;
the approval, availability, market acceptance and reimbursement for the companion diagnostic;
the ability to offer our medicines for sale at competitive prices;
convenience and ease of administration compared to alternative treatments;
the willingness of the target patient population to try new therapies and of physicians to prescribe these therapies;
ensuring uninterrupted product supply;
the strength of marketing and distribution support;
sufficient third-party coverage or reimbursement; and
the prevalence and severity of any side effects.

If we are unable to establish and maintain sales and marketing capabilities or enter into agreements with third parties to sell and market our product candidates, we may not be successful in commercializing PYRUKYND® or any of our product candidates if and when they are approved.
We have littlelimited experience in the sale, marketing or distribution of pharmaceutical products. To achieve commercial success for any approved medicinemedicines for which we retain sales and marketing responsibilities, we must either develop a sales and marketing organization or outsource these functions to other third parties. Although weWe have established sales and marketing capabilities to support our co-promotion effortscommercial launch of PYRUKYND® for IDHIFA®,the treatment of hemolytic anemia in adults with PK deficiency in the United States. In addition, in connection with our regulatory approvals in the EU and Great Britain, we are still buildingcurrently providing access to PYRUKYND® free of charge for eligible patients in those jurisdictions through a global managed access program. We may provide access to PYRUKYND® for adult patients with PK deficiency in other jurisdictions upon request through the global managed access program, on either a free of charge or for charge basis. We may need to further build our sales and marketing infrastructure, either directly or with third-party partners, to sell,maintain our ongoing commercialization efforts and to commercialize PYRUKYND® in other indications or participate in sales activities with our collaborators for,outside of the United States or to commercialize any of our other product candidates if and when they are approved.for which we obtain marketing approval.
There are risks involved with both establishing our own sales and marketing capabilities and entering into arrangements with third parties to perform these services. For example, recruiting and training a sales force is expensive and time consuming and could delay any product launch. If the commercial launch of a product candidate for which we recruit a sales force and establish marketing capabilities is delayed or does not occur for any reason, we would have prematurely or unnecessarily incurred these commercialization expenses. This may be costly, and our investment would be lost if we cannot retain or reposition our sales and marketing personnel.
Factors that may inhibit our efforts to commercialize our medicines on our own include:
our inability to recruit and retain adequate numbers of effective sales and marketing personnel;

the inability of sales personnel to obtain access to physicians or persuade adequate numbers of physicians to prescribe any future medicines;
the lack of complementary medicines to be offered by sales personnel, which may put us at a competitive disadvantage relative to companies with more extensive product lines; and
unforeseen costs and expenses associated with creating an independent sales and marketing organization.
If we enter into arrangements with third parties to perform sales, marketing and distribution services, our product revenue or the profitability of product revenue to us are likely to be lower than if we were to market and sell any medicines that we develop ourselves. In addition, we may not be successful in entering into arrangements with third parties to sell and market our product candidates or may be unable to do so on terms that are favorable to us. We likely will have little control over such third parties,
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and any of them may fail to devote the necessary resources and attention to sell and market our medicines effectively. If we do not establish sales and marketing capabilities successfully, either on our own or in collaboration with third parties, we will not be successful in commercializing PYRUKYND® or any of our product candidates for which we obtain marketing approval.
We provide certain development estimates related to the development of PYRUKYND® and our product candidates. If we do not achieve our projected development estimates in the timeframes we announce and expect, the commercialization of our products may be delayed and, as a result, our stock price may decline.
From time to time, we provide estimates related to the development of PYRUKYND® and our product candidates . We also estimate the timing of the anticipated accomplishment of various scientific, preclinical, clinical, regulatory and other product development goals. These estimates may include the commencement or completion of clinical trials and the submission of regulatory filings. From time to time, we may publicly announce our estimates, including the timing of certain milestones related to our product candidates. All of these estimates are and will be based on numerous assumptions. The actual results and timing of our preclinical and clinical trials can vary dramatically compared to our estimates, in some cases for reasons beyond our control. If our estimates change or we do not meet the timing of our estimates as publicly announced, or at all, the commercialization of our products may be delayed or never achieved and, as a result, our stock price may decline.
We face substantial competition, which may result in others discovering, developing or commercializing products before or more successfully than we do.
The development and commercialization of new drug products is highly competitive. We face competition with respect to PYRUKYND® and our current product candidates, and we and our collaborators will face competition with respect to any product candidates that we or they may seek to develop or commercialize in the future, fromfuture. Potential competitors may include major pharmaceutical companies, specialty pharmaceutical companies, and biotechnology companies, worldwide.academic institutions, government agencies and other public and private research organizations that conduct research, seek patent protection and establish collaborative arrangements for research, development, manufacturing and commercialization. There are a number of large pharmaceutical and biotechnology companies that currently market and sell products or are pursuing the development of products for the treatment of the disease indications for which we are developing our product or our product candidates, such as AMLPK deficiency, thalassemia, SCD, LR MDS, PKU, and high risk myelodysplasia.PV. For example, Jazz Pharmaceuticals plc,Merck and Bristol-Myers Squibb Company, or BMS, are marketing a therapy to treat beta thalassemia and LR MDS and are conducting clinical trials for alpha thalassemia and LR MDS patients that are ESA naïve and non-transfusion dependent; Novartis International AG, or Novartis, Emmaus Life Sciences, and Abbvie Inc. (in collaboration with Roche Holdings Inc., or Roche) and BayerPfizer are each developing or marketing therapies to treat AML. Some competitive productsSCD, with Pfizer continuing to conduct clinical trials for therapies in SCD; BioMarin is marketing and conducting clinical trials for therapies are based on scientific approaches that are the same as or similar to our approach, and others are based on entirely different approaches, for example, in the area of RGDs. Potential competitors also include academic institutions, government agencies and other public and private research organizations that conduct research, seek patent protection and establish collaborative arrangements for research, development, manufacturing and commercialization.
We are developing most of our initial product candidatestreat PKU; Novo is conducting clinical trials for the treatment of cancer. Therealpha and beta thalassemia, SCD and LR MDS; bluebird is marketing a gene therapy to treat transfusion-dependent beta-thalassemia and SCD; Vertex, with CRISPR, is marketing a gene therapy targeting SCD and transfusion-dependent beta-thalassemia; Fulcrum is conducting clinical trials for a potential treatment for SCD; Geron and Keros are conducting clinical trials for potential treatments for LR MDS (for which Geron has a varietyPrescription Drug User Fee Act goal date of availableJune 16, 2024 for their new drug application); PTC, Jnana and Homology are conducting clinical trials for potential treatments for PKU; PharmaEssentia Corp, or PharmaEssentia, and Incyte Corporation, or Incyte, are marketing therapies marketed for cancer. In many cases, these drugsto treat PV, with Protagonist, Ionis, and Silence are administered in combinationdeveloping therapies to enhance efficacy,treat PV; and cancer drugs are frequently prescribed off-label by healthcare professionals. Somea number of the currently approved drug therapies are branded and subject to patent protection, and others are available on a generic basis. Many of these approved drugs are well established therapies and are widely accepted by physicians, patients and third-party payors. Insurers and other third-party payors may also encourage the use of generic products. We expect that IDHIFA®, and other of our product candidates, if approved, will be priced at a significant premium over competitive generic products. This may make it difficult for us to achieve our business strategy of using ourbiotechnology companies have product candidates in combination with existing therapies or replacing existing therapies with our product candidates.clinical development in similar indications as ours.
We are also pursuing product candidates to treat patients with RGDs. There are a variety of treatment options available, including a number of marketed enzyme replacement therapies,ERTs, for treating patients with RGDs.rare diseases. In addition to currently marketed therapies, there are also a number of products that are either enzyme replacementERTs, gene therapies or gene therapiesPK activators in various stages of clinical development to treat RGDs.rare diseases. These products in development may provide efficacy, safety, convenience and other benefits that are not provided by currently marketed therapies.therapies or for which there are no approved treatments. As a result, they may provide significant competition for any of our product candidates for which we obtain marketing approval.
There are also a number of product candidates in preclinical or clinical development by third parties to treat cancer and RGDsrare diseases by targeting cellular metabolism.similar mechanisms of action or target indications as our product candidates. These companies include large pharmaceutical companies, including AstraZeneca plc, Bayer, Eli Lillysuch as Novartis, Novo Nordisk, Pfizer, BMS, Merck and Company, Roche and its subsidiary Genentech, Inc., GlaxoSmithKline plc, Merck & Co., or Merck, Pfizer, Inc., and Genzyme, a Sanofi company. There are alsoVertex as well as biotechnology companies of various sizes, that are developing therapies to target cellular metabolism, including Alexion Pharmaceuticals, Inc.,such as BioMarin, Pharmaceutical Inc., Calithera Biosciences, Inc., Cornerstone Pharmaceuticals, Inc., Daiichi Sankyo Company, Ltd. with its IDH1 mutant inhibitor DS-1001b, Forma Therapeutics Holdings LLC with its IDH1 mutant inhibitor FT-2102, Shire Plc, Raze Therapeutics, Inc.bluebird, PTC and Selvita S.A. In addition, there are several companies developing immunotherapies, including metabolic immunotherapies, targeting cancer, including AstraZeneca PLC, Merck, Bristol-Myers Squibb Company and Novartis. Rocket Pharma.
Our competitors may develop products that are more effective, safer, more convenient or less costly than PYRUKYND® or any product candidates that we are developing or that would render PYRUKYND® or our product candidates obsolete or non-competitive. In addition, our competitors may discover biomarkers that more efficiently measure metabolic pathways than our methods, which may give them a competitive advantage in developing potential products. Our competitors may also obtain marketing approval from the FDA or other regulatory authorities for their products more rapidly

than we may obtain approval for ours, which could result in our competitors establishing a strong market position before we are able to enter the market.
Many of our competitors have significantly greater financial resources and expertise in research and development, manufacturing, preclinical testing, conducting clinical trials, obtaining regulatory approvals and globally marketing approved
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products than we do. Mergers and acquisitions in the pharmaceutical and biotechnology industries may result in even more resources being concentrated among a smaller number of our competitors. Smaller and other clinical stage companies may also prove to be significant competitors, particularly through collaborative arrangements with large and established companies. These third parties compete with us in recruiting and retaining qualified scientific and management personnel, establishing clinical trial sites and patient registration for clinical trials, as well as in acquiring or in-licensing technologies complementary to, or necessary for, our programs.

If the FDA does not grant our products, if and when approved, appropriate periods of data exclusivity before approving generic or follow-on versions of our products, the sales of our products could be adversely affected.
With FDA approval of an NDA, the product covered by the application is specified as a “reference-listed drug” in the FDA’s publication, “Approved Drug Products with Therapeutic Equivalence Evaluations,” or the Orange Book. Manufacturers may seek approval of generic versions of reference-listed drugs through submission of abbreviated new drug applications, or ANDAs, in the United States.
In support of an ANDA, a generic manufacturer need not conduct clinical trials. Rather, the applicantsponsor generally must show that its product has the same active ingredient(s), dosage form, strength, route of administration and conditions of use or labeling as the reference-listed drug and that the generic version is bioequivalent to the reference-listed drug, meaning it is absorbed in the body at the same rate and to the same extent. Generic products may be significantly less costly to bring to market than the reference-listed drug and companies that produce generic products are generally able to offer them at lower prices. Thus, following the introduction of a generic drug, a significant percentage of the sales of any reference-listed drug may be typically lost to the generic product.
A manufacturer may also submit an NDA under section 505(b)(2) of the Federal Food, Drug and Cosmetic Act, or FDCA, that references the FDA’s prior approval of the innovator product or preclinical studies and/or clinical trials that were not conducted by, or for, the sponsor and for which the sponsor has not obtained a right of reference. A 505(b)(2) NDA product, or follow-product, may be for a new or improved version of the original reference listed drug.
The FDA may not approve an ANDA for a generic productor 505(b)(2) NDA until any applicable period of non-patent exclusivity for the reference-listed drug has expired. The Federal Food, Drug, and Cosmetic Act, or FDCA provides a period of five years of non-patentnew chemical entity exclusivity for a new drug containing a new chemical entity, or NCE.active moiety. Specifically, in cases where such exclusivity has been granted, an ANDA or a 505(b)(2) NDA may not be filed with the FDA until the expiration of five years unless the submission is accompanied by a Paragraph IV certification that a patent covering the reference-listed drug is either invalid or will not be infringed by the generic product, in which case the applicantsponsor may submit its application four years following approval of the reference-listed drug. The FDCA also provides a period of three years of new clinical investigation or NCI, data exclusivity in connection with the approval of a supplemental indication for the product for which a clinical trial is deemed by the FDA as essential for approval.
In the event that a generic or follow-on manufacturer is somehow able to obtain FDA approval without adherence to these periods of data exclusivity, the competition that our approved products may face from generic and follow-on versions could negatively impact our future revenue, profitability and cash flows and substantially limit our ability to obtain a return on our investments in those product candidates.
Even if we or any collaborators are able to commercialize any product candidates, such products may become subject to unfavorable pricing regulations, third-party reimbursement practices or healthcare reform initiatives, which would harm our business.
The commercial success of our product candidates will depend substantially, both domestically and abroad, on the extent to which the costs of our product candidates will be paid by third-party payors, including government health administration authorities and private health coverage insurers. If coverage and reimbursement is not available, or reimbursement is available only to limited levels, we, or any future collaborators, may not be able to successfully commercialize our product candidates. Even if coverage is provided, the approved reimbursement amount may not be high enough to allow us, or any future collaborators, to establish or maintain pricing sufficient to realize a sufficient return on our or their investments. In the United States, no uniform policy of coverage and reimbursement for products exists among third-party payors and coverage and reimbursement for products can differ significantly from payor to payor. As a result, the coverage determination process is often a time-consuming and costly process that will require us to provide scientific and clinical support for the use of our products to each payor separately, with no assurance that coverage and adequate reimbursement will be applied consistently or obtained in the first instance.
There is significant uncertainty related to third-party payor coverage and reimbursement of newly approved drugs. Marketing approvals, pricing and reimbursement for new drug products vary widely from country to country. Some countries require approval of the sale price of a drug before it can be marketed. In many countries, the pricing review period begins after marketing or product licensing approval is granted. In some foreign markets, prescription pharmaceutical pricing remains subject to continuing governmental control even after initial approval is granted. As a result, we, or any future collaborators, might obtain marketing approval for a product in a particular country, but then be subject to price regulations that delay commercial launch of the product, possibly for lengthy time periods, which may negatively impact the revenue we are able to

generate from the sale of the product in that country. Adverse pricing limitations may hinder our ability or the ability of any future collaborators to recoup our or their investment in one or more product candidates, even if our product candidates obtain marketing approval.
Patients who are provided medical treatment for their conditions generally rely on third-party payors to reimburse all or part of the costs associated with their treatment. Therefore, our ability, and the ability of any future collaborators, to commercialize any of our product candidates will depend in part on the extent to which coverage and reimbursement for these products and related treatments will be available from third-party payors. Third-party payors decide which medications they will cover and establish reimbursement levels. The healthcare industry is acutely focused on cost containment, both in the United States and elsewhere. Government authorities and other third-party payors have attempted to control costs by limiting coverage and the amount of reimbursement for particular medications, which could affect our ability or that of any future collaborators to sell our product candidates profitably. These payors may not view our products, if any, as cost-effective, and coverage and reimbursement may not be available to our customers, or those of any future collaborators, or may not be sufficient to allow our products, if any, to be marketed on a competitive basis. Cost-control initiatives could cause us, or any future collaborators, to decrease the price we, or they, might establish for products, which could result in lower than anticipated product revenue. If the prices for our products, if any, decrease or if governmental and other third-party payors do not provide coverage or adequate reimbursement, our prospects for revenue and profitability will suffer.
There may also be delays in obtaining coverage and reimbursement for newly approved drugs, and coverage may be more limited than the indications for which the drug is approved by the FDA or comparable foreign regulatory authorities. Moreover, eligibility for reimbursement does not imply that any drug will be paid for in all cases or at a rate that covers our costs, including research, development, manufacture, sale and distribution. Reimbursement rates may vary, by way of example, according to the use of the product and the clinical setting in which it is used. Reimbursement rates may also be based on reimbursement levels already set for lower cost drugs or may be incorporated into existing payments for other services.
In addition, increasingly, third-party payors are requiring higher levels of evidence of the benefits and clinical outcomes of new technologies and are challenging the prices charged. We cannot be sure that coverage will be available for any product candidate that we, or any future collaborator, commercialize and, if available, that the reimbursement rates will be adequate. Further, the net reimbursement for drug products may be subject to additional reductions if there are changes to laws that presently restrict imports of drugs from countries where they may be sold at lower prices thanpatents listed for our drug products in the United States. An inabilityOrange Book, ANDAs and 505(b)(2) NDAs would be required to promptlyinclude a certification as to each listed patent indicating whether the sponsor intends to challenge the patent. We cannot predict which, if any, patents in our current portfolio or patents we may obtain coverage and adequate payment rates from both government-funded and private payorsin the future will be eligible for listing in the Orange Book, how any generic or follow-on competitor would address such patents, whether we would sue on any such patents or the outcome of our product candidates for which we, or any future collaborator, obtain marketing approval could significantly harm our operating results, our ability to raise capital needed to commercialize products and our overall financial condition.such suit.
Product liability lawsuits against us or ourany collaborators could cause us or our collaborators to incur substantial liabilities and could limit commercialization of any medicines that we or they may develop.
We and ourany collaborators face an inherenta risk of product liability exposure related to the testing of our product candidates in human clinical trials and will face an even greater risk as we or they commercially sell any medicines, that we or they may develop.including PYRUKYND®. If we or ourany collaborators cannot successfully defend ourselves or themselves against claims that our product candidates or medicines caused injuries, we or they could incur substantial costs and liabilities. Regardless of merit or eventual outcome, liability claims may also result in:
in, among other things, decreased demand for any product candidates or medicines that we may develop;
injury to our reputationdevelop, reputational harm and significant negative media attention;
withdrawal of clinical trial participants;
significant costs to defend the related litigation;
substantial monetary awards to trial participants or patients;
loss of revenue;
reduced resources of our management to pursue our business strategy; and
the inability to commercialize any medicines that we may develop.lost revenue.
Although we maintain product liability insurance coverage, it may not be adequate to cover all liabilities that we may incur. We anticipate that we will need to increase our insurance coverage as we advance or expand our clinical trials and if we successfully commercialize any medicine. Insurance coverage is increasingly expensive. We may not be able to maintain insurance coverage at a reasonable cost or in an amount adequate to satisfy any liability that may arise. In addition, if one
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Our internal computerinformation technology systems, or those of any collaborators or contractors or consultants,third parties with which we contract, may fail or suffer security breaches, loss of data or other disruptions which could result in a material disruption of our product development programs.programs, compromise sensitive information related to our business or prevent us from accessing critical information, trigger legal obligations, potentially exposing us to liability, competitive or reputational harm or otherwise adversely affecting our business and financial results.
OurDespite the implementation of security measures, our internal computerinformation technology systems and those of any collaborators, contractors or consultantsthird parties with which we contract are vulnerable to damage from computer viruses, worms and other destructive or disruptive software, unauthorized access, natural disasters, terrorism, war and telecommunication and electrical failures. WhileSuch systems are also vulnerable to service interruptions or to security breaches from inadvertent or intentional actions by our employees, third-party vendors and/or business partners, or from cyber incidents by malicious third parties. Cybersecurity incidents are increasing in their frequency, sophistication and intensity, and have become increasingly difficult to detect. Cybersecurity incidents could include the deployment of harmful malware, ransomware, denial-of-service attacks, unauthorized access to or deletion of files, social engineering and other means to affect service reliability and threaten the confidentiality, integrity and availability of information. Cybersecurity incidents also could include phishing attempts or e-mail fraud to cause payments or information to be transmitted to an unintended recipient. Attackers may use artificial intelligence and machine learning to launch more automated, targeted and coordinated attacks against targets. We could be subject to risks caused by misappropriation, misuse, leakage, falsification or intentional or accidental release or loss of information maintained in the information systems and networks of our company, including personal information of our employees. We may not be able to anticipate all types of security threats, and we havemay not experienced anybe able to implement preventive measures effective against all such material system failure, accidentsecurity threats. The techniques used by cyber criminals change frequently, may not be recognized until launched, and can originate from a wide variety of sources, including outside groups such as external service providers, organized crime affiliates, terrorist organizations or hostile foreign governments or agencies.
System failures, accidents, cybersecurity incidents or security breach to date, if such an event were to occur andbreaches could cause interruptions in our operations, itand could result in a material disruption of our development programsclinical and ourcommercialization activities and business operations, whether due to a loss of our trade secrets or other proprietary information or other similar disruptions.disruptions, in addition to possibly requiring substantial expenditures of resources to remedy. For example, the loss of clinical trial data from completed or future clinical trials could result in delays in our regulatory approval efforts and significantly increase our costs to recover or reproduce the data. To the extent that any disruption or security breach were to result in a loss of, or damage to, our data or applications, or inappropriate disclosure of confidential or proprietary information, we could incur liability, our competitive position could be harmed and the furtherour product research, development and commercialization efforts could be delayed. In addition, we may not have adequate insurance coverage to provide compensation for any losses associated with such events.
If a material breach of our security or that of our vendors occurs, the market perception of the effectiveness of our security measures could be harmed, and, as a result, we could lose business and our reputation and credibility could be damaged. We could be required to expend significant amounts of money and other resources to repair or replace information systems or networks. Although we develop and maintain processes, systems and controls designed to prevent these events from occurring, and we have a process to assess, identify and manage threats, the development and maintenance of these systems, controls and processes is costly and requires ongoing monitoring and updating as technologies change and efforts to overcome security measures become more sophisticated. Moreover, despite our efforts, the possibility of these events occurring cannot be eliminated entirely. We cannot guarantee that the measures we have taken to date, and actions we may take in the future, will be sufficient to prevent any cyber-attacks or security breaches.
We are subject to stringent privacy laws, information security laws, regulations, policies and contractual obligations related to data privacy and security and changes in such laws, regulations, policies, contractual obligations and failure to comply with such requirements could subject us to significant fines and penalties, which may have a material adverse effect on our business, financial condition or results of operations.
We are subject to data privacy and protection laws and regulations that apply to the collection, transmission, storage and use of personally-identifying information, which among other things, impose certain requirements relating to the privacy, security and transmission of personal information, including comprehensive regulatory systems in the United States, EU and United Kingdom. The legislative and regulatory landscape for privacy and data protection continues to evolve in jurisdictions worldwide, and there has been an increasing focus on privacy and data protection issues with the potential to affect our business. Failure to comply with any of these laws and regulations could result in enforcement action against us, including fines, imprisonment of company officials and public censure, claims for damages by affected individuals, damage to our reputation and loss of goodwill, any of which could have a material adverse effect on our business, financial condition, results of operations or prospects.
There are numerous U.S. federal and state laws and regulations related to the privacy and security of personal information. In particular, regulations promulgated pursuant to HIPAA establish privacy and security standards that limit the use and disclosure
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of individually identifiable health information, or protected health information, and require the implementation of administrative, physical and technological safeguards to protect the privacy of protected health information and ensure the confidentiality, integrity and availability of electronic protected health information. Determining whether protected health information has been handled in compliance with applicable privacy standards and our contractual obligations can be complex and may be subject to changing interpretation. These obligations may be applicable to some or all of our business activities now or in the future.
If we are unable to properly protect the privacy and security of protected health information, we could be found to have breached our contracts. Further, if we fail to comply with applicable privacy laws, including applicable HIPAA privacy and security standards, we could face civil and criminal penalties. Enforcement activity by the U.S. Department of Health & Human Services, or HHS, can result in financial liability and reputational harm, and responses to such enforcement activity can consume significant internal resources. In addition, state attorneys general are authorized to bring civil actions seeking either injunctions or damages in response to violations that threaten the privacy of state residents. We cannot be sure how these regulations will be interpreted, enforced or applied to our operations. In addition to the risks associated with enforcement activities and potential contractual liabilities, our ongoing efforts to comply with evolving laws and regulations at the federal and state level may be costly and require ongoing modifications to our policies, procedures and systems.
In addition to potential enforcement by HHS, we are also potentially subject to privacy enforcement from the Federal Trade Commission, or FTC. The FTC has been particularly focused on the unpermitted processing of health and genetic data through its recent enforcement actions and is expanding the types of privacy violations that it interprets to be “unfair” under Section 5 of the FTC Act, as well as the types of activities it views to trigger the Health Breach Notification Rule (which the FTC also has the authority to enforce). The agency is also in the process of developing rules related to commercial surveillance and data security that may impact our business. We will need to account for the FTC’s evolving rules and guidance for proper privacy and data security practices in order to mitigate our risk for a potential enforcement action, which may be costly. If we are subject to a potential FTC enforcement action, we may be subject to a settlement order that requires us to adhere to very specific privacy and data security practices, which may impact our business. We may also be required to pay fines as part of a settlement (depending on the nature of the alleged violations). If we violate any consent order that we reach with the FTC, we may be subject to additional fines and compliance requirements.
States are also active in creating specific rules relating to the processing of personal information. In 2018, California passed into law the California Consumer Privacy Act, or CCPA, which took effect on January 1, 2020 and imposed many requirements on businesses that process the personal information of California residents. Many of the CCPA’s requirements are similar to those found in the General Data Protection Regulation, or GDPR, including requiring businesses to provide notice to data subjects regarding the information collected about them and how such information is used and shared, and providing data subjects the right to request access to such personal information and, in certain cases, request the erasure of such personal information. The CCPA also affords California residents the right to opt-out of “sales” of their personal information. The CCPA contains significant penalties for companies that violate its requirements. In November 2020, California voters passed a ballot initiative for the California Privacy Rights Act, or CPRA, which went into effect on January 1, 2023 and significantly expanded the CCPA to incorporate additional GDPR-like provisions including requiring that the use, retention, and sharing of personal information of California residents be reasonably necessary and proportionate to the purposes of collection or processing, granting additional protections for sensitive personal information, and requiring greater disclosures related to notice to residents regarding retention of information. The CPRA also created a new enforcement agency – the California Privacy Protection Agency – whose sole responsibility is to enforce the CPRA, which will further increase compliance risk. The provisions in the CPRA may apply to some of our business activities.
In addition to California, eleven other states have passed comprehensive privacy laws similar to the CCPA and CPRA. These laws are either in effect or will go into effect sometime before the end of 2026. Like the CCPA and CPRA, these laws create obligations related to the processing of personal information, as well as special obligations for the processing of “sensitive” data (which includes health data in some cases). Some of the provisions of these laws may apply to our business activities. There are also states that are strongly considering or are in the process of enacting privacy laws that will go into effect in 2024 and beyond, including New Hampshire and New Jersey. Other states will be considering these laws in the future, and Congress has also been debating passing a federal privacy law. There are also states that are specifically regulating health information that may affect our business. For example, Washington state passed a health privacy law that will regulate the collection and sharing of health information, and the law also has a private right of action, which further increases the relevant compliance risk. Connecticut and Nevada have also passed similar laws regulating consumer health data, and more states are considering such legislation in 2024. These laws may impact our business activities, including our identification of research subjects, relationships with business partners and ultimately the marketing and distribution of our products.
Similar to the laws in the United States, there are significant privacy and data security laws that apply in Europe and other countries. The collection, use, disclosure, transfer, or other processing of personal data, including personal health data, regarding individuals who are located in the EEA, and the processing of personal data that takes place in the EEA, is regulated
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by the GDPR, which went into effect in May 2018 and which imposes obligations on companies that operate in our industry with respect to the processing of personal data and the cross-border transfer of such data. The GDPR imposes onerous accountability obligations requiring data controllers and processors to maintain a record of their data processing and policies. If our or our partners’ or service providers’ privacy or data security measures fail to comply with the GDPR requirements, we may be subject to litigation, regulatory investigations, enforcement notices requiring us to change the way we use personal data and/or fines of up to 20 million Euros or up to 4% of the total worldwide annual turnover of the preceding financial year, whichever is higher, as well as compensation claims by affected individuals, negative publicity, reputational harm and a potential loss of business and goodwill.
The GDPR places restrictions on the cross-border transfer of personal data from the EU to countries that have not been found by the European Commission to offer adequate data protection legislation, such as the United States. There are ongoing concerns about the ability of companies to transfer personal data from the EU to other countries. In July 2020, the Court of Justice of the European Union, or the CJEU, invalidated the EU-U.S. Privacy Shield, one of the mechanisms used to legitimize the transfer of personal data from the EEA to the U.S. The CJEU decision also drew into question the long-term viability of an alternative means of data transfer, the standard contractual clauses, for transfers of personal data from the EEA to the U.S. This CJEU decision has resulted in increased scrutiny on data transfers generally and may increase our costs of compliance with data privacy legislation as well as our costs of negotiating appropriate privacy and security agreements with our vendors and business partners.
Additionally, in October 2022, President Biden signed an executive order to implement the EU-U.S. Data Privacy Framework, which would serve as a replacement to the EU-U.S. Privacy Shield. The European Commission initiated the process to adopt an adequacy decision for the EU-U.S. Data Privacy Framework in December 2022, and the European Commission adopted the adequacy decision on July 10, 2023. The adequacy decision will permit U.S. companies who self-certify to the EU-U.S. Data Privacy Framework to rely on it as a valid data transfer mechanism for data transfers from the EU to the U.S. However, some privacy advocacy groups have already suggested that they will be challenging the EU-U.S. Data Privacy Framework. If these challenges are successful, they may not only impact the EU-U.S. Data Privacy Framework, but also further limit the viability of the standard contractual clauses and other data transfer mechanisms. The uncertainty around this issue has the potential to impact our business internationally.
Following Brexit, the UK Data Protection Act 2018 applies to the processing of personal data that takes place in the United Kingdom and includes parallel obligations to those set forth by GDPR. In relation to data transfers, both the United Kingdom and the EU have determined, through separate “adequacy” decisions, that data transfers between the two jurisdictions are in compliance with the UK Data Protection Act and the GDPR, respectively. The United Kingdom and the U.S. are also in discussions to develop a US-UK “data bridge”, which would function similarly to the EU-U.S. Data Privacy Framework and provide an additional legal mechanism for companies to transfer data from the United Kingdom to the U.S. In addition to the United Kingdom, Switzerland is also in the process of approving an adequacy decision in relation to the Swiss-U.S. Data Privacy Framework (which would function similarly to the EU-U.S. Data Privacy Framework and the U.S.-UK “data bridge” in relation to data transfers from Switzerland to the United States). Any changes or updates to these developments have the potential to impact our business.
Beyond GDPR, there are privacy and data security laws in a growing number of countries around the world. While many loosely follow GDPR as a model, other laws contain different or conflicting provisions. These laws will impact our ability to conduct our business activities, including both our clinical trials and the sale and distribution of commercial products, through increased compliance costs, costs associated with contracting and potential enforcement actions.
While we continue to address the implications of the recent changes to data privacy regulations, data privacy remains an evolving landscape at both the domestic and international level, with new regulations coming into effect and continued legal challenges, and our efforts to comply with the evolving data protection rules may be unsuccessful. It is possible that these laws may be interpreted and applied in a manner that is inconsistent with our practices. We must devote significant resources to understanding and complying with this changing landscape. Failure to comply with laws regarding data protection would expose us to risk of enforcement actions taken by data protection authorities in the EEA and elsewhere and carries with it the potential for significant penalties if we are found to be non-compliant. Similarly, failure to comply with federal and state laws in the United States regarding privacy and security of personal information could expose us to penalties under such laws. Any such failure to comply with data protection and privacy laws could result in government-imposed fines or orders requiring that we change our practices, claims for damages or other liabilities, regulatory investigations and enforcement action, litigation and significant costs for remediation, any of which could adversely affect our business. Even if we are not determined to have violated these laws, government investigations into these issues typically require the expenditure of significant resources and generate negative publicity, which could harm our business, financial condition, results of operations or prospects.
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Risks Related to Our Financial Position
We face new challenges as a smaller, less diversified company following the sale of our oncology business to Servier.
We developed most of our initial products and product candidates for the treatment of various types of cancer. The sale of our oncology business to Servier in 2021, including our approved products at the time of sale, TIBSOVO® and IDHIFA®, has resulted in us being a smaller, less diversified company with a more limited business concentrated on products and product candidates for the treatment of rare diseases. The success of the rare disease business is subject to various risks and uncertainties, including the possibility that we may not be able to successfully commercialize PYRUKYND®, the possibility of adverse clinical and other developments in respect of PYRUKYND® or our other product candidates of the rare disease business, and unanticipated changes in applicable laws and regulations that may adversely affect the rare disease business.
We may be more susceptible to changing market conditions, including fluctuations and risks particular to the markets for patients with rare diseases, than a more diversified company, which could adversely affect our business, financial condition and results of operations. In addition, even with the FDA approval of PYRUKYND®, the diversification of our revenues, costs and cash flows has diminished following the sale of our oncology business. Our results of operations, cash flows, working capital and financing requirements may be subject to increased volatility and our ability to fund capital expenditures and investments or satisfy other financial commitments may be diminished.
Raising additional capital may restrict our operations, require us to relinquish rights to our technologies or product candidates or cause dilution to our stockholders.
Until such time, if ever, as we can generate substantial product revenue, including from sales of PYRUKYND®, we expect to finance our cash needs primarily through cash on hand, a potential milestone payment and royalties from Servier if a new drug application for vorasidenib is approved by the FDA with a label that permits vorasidenib's use as a single agent for the adjuvant treatment of patients with Grade 2 glioma that have an isocitrate dehydrogenase 1 or 2 mutation, and, potentially, collaborations, strategic alliances, licensing arrangements and other nondilutive strategic transactions. In addition, we may pursue opportunistic debt offerings, and equity or equity-linked offerings. We do not have any committed external source of funds other than the potential milestone and royalty payments that we are eligible to receive with respect to vorasidenib under our purchase agreement with Servier. To the extent that we raise additional capital through the sale of equity or convertible debt securities, the ownership interest of our stockholders will be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect the rights of our common stockholders. Debt financing, if available, may require us to enter into agreements that include covenants limiting or restricting our ability to take specific actions, such as incurring additional debt, selling or licensing our assets, making capital expenditures or declaring dividends. In addition, securing financing could require a substantial amount of time and attention from our management and may divert a disproportionate amount of their attention away from day-to-day activities, which may adversely affect our management’s ability to oversee the development of our product candidates.
If we raise funds through collaborations, strategic alliances or licensing arrangements with third parties, we may have to relinquish valuable rights to our technologies, future revenue streams, research programs or product candidates or to grant licenses on terms that may not be favorable to us.
If our existing capital is insufficient to fund our operating expenses and capital expenditures, we will need to raise capital, and if weare unable to raise capital when needed, we would be forced to delay, reduce or eliminate our product development programs or commercialization efforts.
We expect to incur significant expenses as we continue to advance our ongoing activities. Our estimate as to how long we expect our existing cash, cash equivalents, and marketable securities to be available to fund our operating expenses and capital expenditures is based on assumptions that may prove to be wrong, and we could use our available capital resources sooner than we currently expect. Further, changing circumstances, some of which may be beyond our control, could cause us to consume capital significantly faster than we currently anticipate, and we may need to seek additional funds. Our future capital requirements will depend on many factors, including:
the amount and timing of future revenue received from commercial sales of PYRUKYND® and any of our other product candidates for which we may receive marketing approval;
the amount of contingent consideration we ultimately receive from Servier;
the costs and timing of our ongoing commercialization activities, including product manufacturing, sales, marketing and distribution, for PYRUKYND® for the treatment of adults with PK deficiency in the approved jurisdictions;
the anticipated cost-savings associated with the evolution of our research organization;
the scope, progress, results and costs of preclinical development, laboratory testing and clinical trials for our product candidates;
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the costs associated with in-licensing or acquiring assets for pipeline growth, including the amount and timing of future milestone and royalty payments payable to Alnylam pursuant to the license agreement;
the costs, timing and outcome of regulatory review of our product candidates;
the costs of preparing, filing and prosecuting patent applications, maintaining and enforcing our intellectual property rights and defending intellectual property-related claims;
the costs and timing of future commercialization activities, including product manufacturing, sales, marketing and distribution, for any of our product candidates for which we may receive marketing approval;
our ability to establish and maintain collaborations on favorable terms, if at all;
our ability to successfully execute on our strategic plans;
operational delays due to public health epidemics, including the recent COVID-19 pandemic; and
operational delays, disruptions and/or increased costs associated with global economic developments, rising global energy prices or energy shortages or rationing.
We have historically incurred operating losses. We expect to incur losses in the future and may never achieve or maintain profitability.
We have a history of incurring operating losses. Our net losses for the twelve months ended December 31, 2023 and 2022 were $352.1 million and $231.8 million, respectively. As of December 31, 2023, we had an accumulated deficit of $822.6 million. Prior to the sale of our oncology business to Servier in March 2021, we had generated only modest revenue from sales of TIBSOVO® and, prior to our sale to Royalty Pharma of our royalty rights to IDHIFA®, from royalties on sales of IDHIFA®. Following receipt of marketing approval in February 2022, we have begun to commercialize PYRUKYND® for the treatment of hemolytic anemia in adults with PK deficiency in the United States. We are currently providing access to PYRUKYND® free of charge for eligible patients in the EU and Great Britain through a global managed access program, and we may provide access to PYRUKYND® for adult patients with PK deficiency in other jurisdictions through the global managed access program on either a free of charge or for charge basis. PYRUKYND® is the first product we have received marketing approval for following the sale of our oncology business. We have neither obtained marketing approval for PYRUKYND® in any other indications nor have we obtained marketing approval for any of our other product candidates, all of which are in preclinical or clinical development stages.
Following the sale of our oncology business, we have financed and expect to continue to finance our operations primarily through cash on hand, royalty payments from Servier with respect to U.S. net sales of TIBSOVO® prior to the sale of these royalty rights to Sagard, proceeds from the sale of our rights to the royalty on U.S. net sales of TIBSOVO® to Sagard, a potential milestone payment and royalties from Servier if a new drug application for vorasidenib is approved by the FDA with a label that permits vorasidenib's use as a single agent for the adjuvant treatment of patients with Grade 2 glioma that have an isocitrate dehydrogenase 1 or 2 mutation, the actual and potential future sales of PYRUKYND® and, potentially, collaborations, strategic alliances, licensing arrangements and other nondilutive strategic transactions. In addition, we may pursue opportunistic debt offerings, and equity or equity-linked offerings. We expect to continue to incur significant expenses and net losses until such time as we are able to report profitable results. The net losses we incur may fluctuate significantly from quarter to quarter. We anticipate that we will incur significant expenses if and as we:
commercially launch PYRUKYND® for approved indications in approved jurisdictions;
continue to establish and maintain a sales, marketing and distribution infrastructure to commercialize PYRUKYND® and other product candidates for which we may obtain marketing approval;
initiate and continue clinical trials for our products and product candidates, including PYRUKYND® in other indications;
continue our research and preclinical development of our product candidates and seek to identify additional product candidates;
seek marketing approvals for our product candidates that successfully complete clinical trials;
require the manufacture of larger quantities of product candidates for clinical development and commercialization;
maintain, expand and protect our intellectual property portfolio;
add additional personnel to support our product research and development and planned future commercialization efforts and our operations;
add equipment and physical infrastructure to support our research and development; and
acquire or in-license other product candidates, medicines and technologies.
To become and remain profitable, we must develop and successfully commercialize medicines with significant market potential. This will require us to be successful in a range of challenging activities, including completing preclinical testing and
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clinical trials of our product candidates, obtaining marketing approval for these product candidates, manufacturing, marketing and selling those medicines for which we may obtain marketing approval and satisfying any post-marketing requirements. If we do achieve profitability, we may not be able to sustain or increase profitability on a quarterly or annual basis. Our failure to become and remain profitable would decrease the value of our company and could impair our ability to raise capital, maintain our research and development efforts, expand our business or continue our operations. A decline in the value of our company could also cause our stockholders to lose all or part of their investment.
The amount of contingent consideration we will receive from the sale of our oncology business to Servier is subject to various risks and uncertainties.
Upon closing of the sale of our oncology business to Servier, Servier assumed certain liabilities with respect to the oncology business and paid to us: approximately $1.8 billion in cash, net of certain adjustments for the working capital of the oncology business at the time of closing of the transaction and amounts for a representation and warranty insurance policy.In addition, Servier agreed to pay to us:
$200.0 million in cash if, prior to January 1, 2027, vorasidenib is granted approval for an NDA from the FDA with an approved label that permits vorasidenib’s use as a single agent for the adjuvant treatment of patients with Grade 2 glioma that have an IDH1 or IDH2 mutation (and, to the extent required by such approval, the vorasidenib companion diagnostic test is granted an FDA premarket approval);
a royalty payment of 5% of the U.S. net sales (as defined in the purchase agreement with Servier) of TIBSOVO® from the completion of the transaction through loss of exclusivity of TIBSOVO®, which we sold to Sagard in October 2022; and
a royalty payment of 15% of the U.S. net sales (as defined in the purchase agreement with Servier) of vorasidenib from its first commercial sale through loss of exclusivity of vorasidenib.
The contingent consideration described above is subject to various risks and uncertainties.
Prior to the sale to Sagard, we have received royalties from Servier on U.S. net sales of TIBSOVO®. We cannot however predict what success, if any, Servier may have in the United States with respect to future sales of vorasidenib, if approved, and, therefore, we cannot predict the amount of royalty payments that we can expect to receive from Servier prior to the loss of exclusivity of vorasidenib. The potential royalty payments with respect to vorasidenib are also subject to deductions and other adjustments under the terms of the purchase agreement, the amounts of which are uncertain as of the date of this report. In addition, there is no guarantee that vorasidenib will be delayed.approved by the FDA, and that, as such we will receive the $200.0 million regulatory milestone payment.
Changes in tax laws or in their implementation or interpretation may adversely affect our business and financial condition.
Changes in tax law may adversely affect our business or financial condition.On December 22, 2017, the U.S. government enacted the Tax Cuts and Jobs Act, or the Tax Act, which significantly reformed the U.S. Internal Revenue Code of 1986, as amended, or the Code. The Tax Act, among other things, contained significant changes to corporate taxation.
As part of Congress’ response to the recent COVID-19 pandemic, economic relief legislation was enacted in 2020 and 2021. Such legislation contains numerous tax provisions. In addition, the Inflation Reduction Act of 2022, or IRA, was signed into law in August 2022.The IRA introduced new tax provisions, including a 1% excise tax imposed on certain stock repurchases by publicly traded corporations. The 1% excise tax generally applies to any acquisition by the publicly traded corporation (or certain of its affiliates) of stock of the publicly traded corporation in exchange for money or other property (other than stock of the corporation itself), subject to a de minimis exception. Thus, the excise tax could apply to certain transactions that are not traditional stock repurchases. Regulatory guidance under the IRA, the Tax Act, and such additional legislation is and continues to be forthcoming, and such guidance could ultimately increase or lessen impact of these laws on our business and financial condition. In addition, it is uncertain if and to what extent various states will conform to the IRA, the Tax Act, and additional tax legislation.
Risks Related to Our Dependence on Third Parties
We depend on our collaborations and may depend on collaborations with additional third parties for the development and commercialization of our product candidates. If those collaborations are not successful, we may not be able to capitalize on the market potential of these product candidates.
We are party to several collaboration agreements, including the 2010 Agreement, the AG-881 Agreements and the 2016 Agreement. These collaborations involve complex allocations of rights, provide for milestone payments to us based on the achievement of specified clinical development, regulatory and commercial milestones, provide us with royalty-based revenue if certain product candidates are successfully commercialized and provide for cost reimbursements of certain development activities. We cannot predict the success of these collaborations.
We may seek other third-party collaborators for the development and commercialization of our product candidates. Our likely collaborators for any collaboration arrangements include large and mid-size pharmaceutical companies, regional and national pharmaceutical companies and biotechnology companies. If we enter into any such arrangements with any third parties, we will likely have limited control over the amount and timing of resources that our collaborators dedicate to the development or commercialization of our product candidates. Our ability to generate revenue from these arrangements will depend on our collaborators’ abilities to successfully perform the functions assigned to them in these arrangements.
Collaborations involving our product candidates, including our collaborations with Celgene, pose the following risks to us:
Collaborators have significant discretion in determining the efforts and resources that they will apply to these collaborations. Under the 2010 Agreement, the AG-881 Agreements and programs under a co-development and co-commercialization agreement pursuant to the 2016 Agreement, development and commercialization plans and strategies for licensed programs, such as IDHIFA®, will be conducted in accordance with a plan and budget approved by a joint committee comprised of equal numbers of representatives from each of us and Celgene, as to which Celgene may have final decision-making authority. For example, Celgene has elected not to participate in our planned perioperative study of ivosidenib and AG-881 in patients with low grade glioma and, pursuant to the AG-881 Agreements, we will fund the trial ourselves.
Collaborators may not pursue development and commercialization of our product candidates or may elect not to continue or renew development or commercialization programs based on clinical trial results, changes in the collaborator’s strategic focus or available funding or external factors such as an acquisition that diverts resources or creates competing priorities. For example, under the 2016 Agreement, it is possible for Celgene to elect not to progress into preclinical development a product candidate that we have nominated and the joint research committee confirmed, without triggering a termination of the collaboration arrangement.
Collaborators may delay clinical trials, provide insufficient funding for a clinical trial program, stop a clinical trial or abandon a product candidate, repeat or conduct new clinical trials or require a new formulation of a product candidate for clinical testing, which may result in a need for additional capital to pursue further development or commercialization of the applicable product candidate. For example, under the 2010 Agreement and the 2016 Agreement, it is possible for Celgene to terminate the agreement, upon 90 days prior written notice, with respect to any product candidate at any point in the research, development and clinical trial process, without triggering a termination of the remainder of the collaboration arrangement.
Collaborators could independently develop, or develop with third parties, products that compete directly or indirectly with our medicines or product candidates if the collaborators believe that competitive products are more likely to be successfully developed or can be commercialized under terms that are more economically attractive than ours.

Collaborators with marketing and distribution rights to one or more medicines may not commit sufficient resources to the marketing and distribution of such medicine or medicines.
Collaborators may not properly maintain or defend our intellectual property rights or may use our proprietary information in such a way as to invite litigation that could jeopardize or invalidate our proprietary information or expose us to potential litigation. For example, under specified circumstances Celgene has the first right to maintain or defend our intellectual property rights with respect to IDHIFA® under the 2010 Agreement and, although we may have the right to assume the maintenance and defense of our intellectual property rights if Celgene does not, our ability to do so may be compromised by Celgene’s actions.
Disputes may arise between the collaborators and us that result in the delay or termination of the research, development or commercialization of our medicines or product candidates or that result in costly litigation or arbitration that diverts management attention and resources.
We may lose certain valuable rights under circumstances identified in our collaborations, including, in the case of our agreements with Celgene, if we undergo a change of control.
Collaborations may be terminated and, if terminated, may result in a need for additional capital to pursue further development or commercialization of the applicable product candidates. For example, Celgene can terminate its agreements with us, in their entirety or with respect to IDHIFA® under the 2010 Agreement or any program under the 2016 Agreement, upon 90 days’ notice and can terminate each entire agreement with us in connection with a material breach of the agreement by us that remains uncured for a period ranging from 60 to 90 days.
Collaboration agreements may not lead to development or commercialization of product candidates in the most efficient manner or at all.
If a present or future collaborators of ours were to be involved in a business combination, the continued pursuit and emphasis on our product development or commercialization program under such collaboration could be delayed, diminished or terminated.
We may seek to establish additional collaborations, and, if we are not able to establish them on commercially reasonable terms, we may have to alter our development and commercialization plans.
Our drug development programs and the potential commercialization of our product candidates will require substantial additional cash to fund expenses. For some of our product candidates, we may decide to collaborate with additional pharmaceutical and biotechnology companies for the development and potential commercialization of those product candidates.
We face significant competition in seeking appropriate collaborators. Whether we reach a definitive agreement for a collaboration will depend, among other things, upon our assessment of the collaborator’s resources and expertise, the terms and conditions of the proposed collaboration and the proposed collaborator’s evaluation of a number of factors. Those factors may include the design or results of clinical trials, the likelihood of approval by the FDA or similar regulatory authorities outside the United States, the potential market for the subject product candidate, the costs and complexities of manufacturing and delivering such product candidate to patients, the potential of competing products, the existence of uncertainty with respect to our ownership of technology, which can exist if there is a challenge to such ownership without regard to the merits of the challenge, and industry and market conditions generally. The collaborator may also consider alternative product candidates or technologies for similar indications that may be available to collaborate on and whether such collaboration could be more attractive than the one with us for our product candidate.
We may also be restricted under existing collaboration agreements from entering into future agreements on certain terms with potential collaborators. For example, during the discovery phase of the 2016 Agreement, we may not directly or indirectly develop, manufacture or commercialize, except pursuant to the agreement, any medicine or product candidate with specified activity against certain metabolic targets except in connection with certain third-party collaborations or with respect to certain targets the rights to which have reverted back to us pursuant to the terms of the 2016 Agreement. Following the discovery phase until termination or expiration of the 2010 Agreement, either in its entirety or with respect to the relevant program, we may not directly or indirectly develop, manufacture or commercialize, outside of the collaboration, any medicine or product candidate with specified activity against any collaboration target that is within a licensed program or against any former collaboration target against which Celgene is conducting an independent program under the agreement. Following the discovery phase of the 2016 Agreement until termination or expiration of the applicable co-development and co-commercialization agreement or license agreement under the 2016 Agreement, we may not directly or indirectly develop, manufacture or commercialize, outside of the collaboration, any medicine or product candidate with specified activity against the collaboration target that is the subject of such co-development and co-commercialization agreement or license agreement, except in connection with certain

third-party collaborations or with respect to certain targets the rights to which have reverted back to us pursuant to the terms of the 2016 Agreement.
Collaborations are complex and time-consuming to negotiate and document. In addition, there have been a significant number of business combinations among large pharmaceutical companies that have resulted in a reduced number of potential future collaborators.
We may not be able to negotiate collaborations on a timely basis, on acceptable terms, or at all. If we are unable to do so, we may have to curtail the development of the product candidate for which we are seeking to collaborate, reduce or delay its development program or one or more of our other development programs, delay its potential commercialization or reduce the scope of any sales or marketing activities, or increase our expenditures and undertake development or commercialization activities at our own expense. If we elect to increase our expenditures to fund development or commercialization activities on our own, we may need to obtain additional capital, which may not be available to us on acceptable terms or at all. If we do not have sufficient funds, we may not be able to further develop our product candidates or bring them to market and generate product revenue.
We rely and expect to continue to rely on third parties to conduct our clinical trials and some aspects of our research and preclinical testing, and those third parties may not perform satisfactorily, including failing to meet deadlines for the completion of such trials, research or testing.
We do not independently conduct clinical trials of any of our product candidates. We rely and expect to continue to rely on third parties, such as CROs, clinical data management organizations, medical institutions and clinical investigators, to conduct our clinical trials. In addition, we currently rely and expect to continue to rely on third parties to conduct some aspects of our research and preclinical testing. Any of these third parties may terminate their engagements with us, some in the event of an
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uncured material breach and some at any time. If any of our relationships with these third parties terminate, we may not be able to enter into similar arrangements with alternative third-parties or to do so on commercially reasonable terms. Switching or adding additional third parties involves additional cost and requires management time and focus. In addition, there is a natural transition period when a new third party commences work. As a result, delays may occur in our product development activities. Although we seek to carefully manage our relationships with our CROs, we could encounter similarsuch challenges or delays in the future and these challenges or delaysthat could have a material adverse impact on our business, financial condition and prospects.
Our reliance on third parties for research and development activities will reducereduces our control over these activities but willdoes not relieve us of our responsibilities. For example, we are responsible for ensuring that each of our studies is conducted in accordance with the applicable protocol and legal, regulatory and scientific standards, and our reliance on third parties does not relieve us of our responsibility to comply with any such standards. We and these third parties are required to comply with current good clinical practices, or cGCP, which are regulations and guidelines enforced by the FDA, the Competent Authorities of the Member States of the European Economic AreaEEA and comparable foreign regulatory authorities for all of our productsproduct candidates in clinical development. Regulatory authorities enforce these cGCPs through periodic inspections of trial sponsors, principal investigators and trial sites. If we or any of these third parties fail to comply with applicable cGCPs, the clinical data generated in our clinical trials may be deemed unreliable and the FDA, the EMA, or comparable foreign regulatory authorities may require us to perform additional clinical trials before approving our marketing applications. We cannot assure you that upon inspection by a given regulatory authority, such regulatory authority will determine that any of our clinical trials comply with cGCP regulations. In addition, our clinical trials must be conducted with product produced under current good manufacturing practices, or cGMP, regulations. Our failure to comply with these regulations may require us to repeat clinical trials, which would delay the regulatory approval process. We also are required to register ongoing clinical trials and post the results of completed clinical trials on a U.S. government-sponsored database, clinicaltrials.gov, within certain timeframes. Failure to do so can result in fines, adverse publicity, and civil and criminal sanctions. We are exposed to risk of fraud or other misconduct by such third parties.
Furthermore, third parties on whom we rely may also have relationships with other entities, some of which may be our competitors. In addition, these third parties are not our employees, and except for remedies available to us under our agreements with such third parties, we cannot control whether or not they devote sufficient time and resources to our on-going clinical, nonclinical, and preclinical programs.
If these third parties do not successfully carry out their contractual duties or obligations or meet expected deadlines, if they need to be replaced or if the quality or accuracy of the clinical data they obtain is compromised, due to the failure to adhere to our clinical protocols, regulatory requirements or for other reasons, our clinical trials may be extended, delayed or terminated and we may not be able to obtain, or may be delayed in obtaining, marketing approvals for our product candidates and will not be able to, or may be delayed in our efforts to successfully commercialize our medicines. As
If either we or any third parties on which we rely are adversely impacted by rising global energy costs or energy shortages or rationing, delays may occur in our product development activities, which delays could have a result,material adverse impact on our results of operationsbusiness, financial condition and the commercial prospects for our medicines would be harmed, our costs could increase and our ability to generate revenue could be delayed.prospects.
We also rely and expect to continue to rely on other third parties to store and distribute drug supplies for our clinical trials. Any performance failure on the part of our distributors could delay clinical development or marketing approval of our product candidates or commercialization of our medicines, producing additional losses and depriving us of potential product revenue.

We contract with third parties for the manufacture of our product candidates for preclinical and clinical testing and expect to continue to do so for late-stage clinical trials and for commercialization. This reliance on third parties increases the risk that we will not have sufficient quantities of our product candidates or medicines or that such supply will not be available to us at an acceptable cost, which could delay, prevent or impair our development or commercialization efforts.
We do not have any manufacturing or supply chain related facilities. We currently rely, and expect to continue to rely, on third-party manufacturers for the materials and manufacture of our product candidates for preclinical and clinical testing and for commercial supply of PYRUKYND® and any of these product candidatescandidate for which we or our collaborators obtain marketing approval. To date, we have obtained materials for our product candidates for our ongoing preclinical and clinical testing from third-party manufacturers.
Although we have entered into long-term supply agreements in place for commercial supply of ivosidenibPYRUKYND® with third-party manufacturers, we purchase the rest of our required drug supply on a purchase order basis.
We may be unable to establish any furthersimilar long-term supply agreements with third-party manufacturers with respect to our other product candidates or to do so on acceptable terms. Even if we are able to establish agreements with third-party manufacturers, reliance on third-party manufacturers entails additional risks, including:
reliance on the third party for regulatory compliance, quality assurance, environmental and quality assurance;safety and pharmacovigilance reporting;
the possible breach of the manufacturing agreement by the third party; and
the possible termination or nonrenewal of the agreement by the third party at a time that is costly or inconvenient for us; and
reliance on the third party for regulatory compliance, quality assurance, environmental and safety and pharmacovigilance reporting.us.
Third-party manufacturers may not be able to comply with cGMPcGMPs, regulations or similar regulatory requirements on a global basis. Our failure, or the failure of our third-party manufacturers, to comply with currently applicable regulations, or regulations or specifications to which we become subject in the future, could result in sanctions being imposed on us, including fines,
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injunctions, civil penalties, delays, suspension or withdrawal of approvals, license revocation, seizures or recalls of product candidates or medicines, operating restrictions and criminal prosecutions, any of which could significantly and adversely affect supplies of our medicines and harm our business and results of operations.
Any medicines thatIf either we or any third parties on which we rely are adversely impacted by restrictions resulting from the recent COVID-19 pandemic, the emergence of another public health epidemic, by rising global energy costs or energy shortages or rationing and/or the impacts of the Russia-Ukraine war, our supply chain may develop may compete with otherbe disrupted, limiting our ability to manufacture our product candidates for our clinical trials and productsresearch and development operations and our product for access to manufacturing facilities. There are a limited number of manufacturers that operate under cGMP regulations and that might be capable of manufacturing for us.commercialization.
Any performance failure on the part of our existing or future manufacturers could delay preclinical development, clinical development, marketing approval or marketing approval. Weour commercialization efforts. Due to the volatility of the supply networks globally, we have obtained regulatory approval for redundant supply of raw materials and active pharmaceutical ingredient for PYRUKYND®, and have an ongoing program to monitor supply, including establishing safety stocks. While we maintain a broad safety stock of drug product, we do not currently have arrangements in place for redundant supply for bulk drug substance or drug product. If any one of our current contract manufacturers cannot perform as agreed, we may be required to replace that manufacturer. Although we believe that there are several potential alternative manufacturers who could manufacture our product or our product candidates, we may incur added costs and delays in identifying and qualifying any such replacement.
Our current and anticipated future dependence upon others for the manufacture of our product candidates or medicines may adversely affect our future profit margins and our ability to commercialize any medicines that receive marketing approval on a timely and competitive basis.
We may depend on collaborations with third parties for the development and commercialization of our product candidates. If those collaborations are not successful, we may not be able to capitalize on the market potential of these product candidates.
We may seek collaborations for the development and commercialization of our product candidates with large and mid-size pharmaceutical companies and biotechnology companies. We face significant competition in seeking appropriate collaborators. Collaborations are complex and time-consuming to negotiate and document. Whether we reach a definitive agreement for a collaboration will depend, among other things, upon our assessment of the collaborator’s resources and expertise, the terms and conditions of the proposed collaboration and the proposed collaborator’s evaluation of a number of factors. We may not be able to negotiate collaborations on a timely basis, on acceptable terms, or at all. Collaborators may have rights that restrict us from entering into future agreements on certain terms with potential collaborators.
If we enter into any such arrangements with collaborators, we will likely have limited control over the amount and timing of resources that our collaborators dedicate to the development or commercialization of our product candidates. Collaborators may not pursue development and commercialization of our product candidates or may elect not to continue or renew development or commercialization programs based on clinical trial results, changes in the collaborator’s strategic focus or available funding or external factors such as an acquisition that diverts resources or creates competing priorities. Collaborators may delay clinical trials, provide insufficient funding for a clinical trial program, stop a clinical trial or abandon a product candidate, repeat or conduct new clinical trials or require a new formulation of a product candidate for clinical testing, which may result in a need for additional capital to pursue further development or commercialization of the applicable product candidate. Collaborators may not properly maintain or defend our intellectual property rights or may use our proprietary information in such a way as to invite litigation that could jeopardize or invalidate our proprietary information or expose us to potential litigation. Disputes may arise between the collaborators and us that result in the delay or termination of the research, development or commercialization of our medicines or product candidates or that result in costly litigation or arbitration that diverts management attention and resources. In addition, our ability to enter into arrangements with collaborators in specific regions, such as the Middle East, may be affected by localized geopolitical unrest or military conflict, such as the current armed conflict in Israel and the Gaza Strip.
Our ability to generate revenue from these arrangements will depend on our collaborators’ abilities to successfully perform the functions assigned to them in these arrangements.
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Risks Related to Our Intellectual Property
If we are unable to obtain and maintain patent or trade secret protection for our medicines and technology, or if the scope of the patent protection obtained is not sufficiently broad, our competitors could develop and commercialize medicines and technology similar or identical to ours, and our ability to successfully commercialize our medicines and technology may be adversely affected.
Our success depends in large part on our ability to obtain and maintain patent protection in the United States and other countries with respect to our proprietary medicines and technology. We seek to protect our proprietary position by filing patent applications in the United States and abroad related to our novel technologies and medicines that are important to our business. We do not yet have issued patents for all our most advanced product candidates in all markets in which we intend to commercialize.commercialize but we continue to actively pursue patent protection for our assets around the world.
The patent prosecution process is expensivecostly and time-consuming, and we may not be able to file and prosecute all necessary or desirable patent applications at a reasonable cost or in a timely manner. It is also possible that we will fail to identify patentable aspectsand/or file patent applications on every aspect of our research and development output before itthat is too late to obtainor may be eligible for patent protection. Although we enter into non-disclosure and confidentiality agreements with parties who may have access to patentable aspects of our research and development output, such as our employees, corporate collaborators, outside scientific collaborators, contract research organizations, contract manufacturers, consultants, advisors and other third parties, any of these parties may breach the agreements and disclose such output before a patent application is filed, thereby jeopardizing our ability to seek patent protection.

There is also the possibility that loss or theft of data or records may jeopardize the ability to seek patent protection or impede the progress or drafting of patent applications.
We have licensed patent rights, and in the future may license additional patent rights, from third parties. Such licenses may be accompanied by milestone and/or royalty payment obligations. These licensed patent rights may be valuable to our business, and we may not have the right to control the preparation, filing and prosecution of patent applications, or to maintain the patents, covering technology or medicines underlying such licenses. We cannot be certain that these patents and applications will be prosecuted and enforced in a manner consistent with the best interests of our business. If any such licensors fail to maintain such patents, or lose rights to those patents, the rights we have licensed may be reduced or eliminated and our right to develop and commercialize any of our products that are the subject of such licensed rights could be adversely affected. In addition to the foregoing, the risks associated with patent rights that we license from third parties also apply to patent rights we own.
The patent position of biotechnology and pharmaceutical companies generally is highly uncertain, involves complex legal and factual questions and has in recent years been the subject of much litigation. As a result, the issuance, scope, validity, enforceability and commercial value of our patent rights are highly uncertain. Our pending and future patent applications may not result in patents being issued that protect our technology or medicines or that effectively prevent others from commercializing competitive technologies and medicines. Changes in either the patent laws or interpretation of the patent laws in the United States and other countries may diminish the value of our patents or narrow the scope of our patent protection. The laws of foreign countries may not protect our rights to the same extent as the laws of the United States. Publications of discoveries in the scientific literature often lag behind the actual discoveries, and patent applications in the United States and other jurisdictions are typically not published until 18 months after filing, or in some cases not at all. Therefore, we cannot be certain that we were the first to make the inventions claimed in our owned or licensed patents or pending patent applications, or that we were the first to file for patent protection of such inventions.
Assuming the other requirements for patentability are met, prior to March 2013, in the United States, the first to make the claimed invention was entitled to the patent, while outside the United States, the first to file a patent application was entitled to the patent. Beginning in March 2013, the United States transitioned to a first inventor to file system in which, assuming the other requirements for patentability are met, the first inventor to file a patent application will be entitled to the patent. We may be subject to a third-party preissuancepre-issuance submission of prior art to the U.S. Patent and Trademark Office, or PTO,USPTO, or become involved in opposition, derivation, revocation, reexamination, post-grant and inter partes review or interference proceedings challenging our patent rights or the patent rights of others. An adverse determination in any such submission, proceeding or litigation could reduce the scope of, or invalidate, our patent rights, allow third parties to commercialize our technology or products and compete directly with us, without payment to us, or result in our inability to manufacture or commercialize medicines without infringing third-party patent rights.
Even if our patent applications issue as patents, they may not issue in a form that will provide us with any meaningful protection, prevent competitors or other third parties from competing with us or otherwise provide us with any competitive advantage. Our competitors or other third parties may be able to circumvent our patents by developing similar or alternative technologies or products in a non-infringing manner.
The issuance of a patent is not conclusive as to its inventorship, scope, validity or enforceability, and our patents may be challenged in the courts or patent offices in the United States and abroad. Such challenges may result in loss of exclusivitythe patent or in
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one or more patent claims being narrowed invalidated or held unenforceable,invalidated, which could limit our ability to stop others from using or commercializing similar or identical technology and products, or limit the duration of the patent protection of our technology and medicines. Given the significant amount of time required for the discovery, development, preclinical and clinical testing and regulatory review and approval of new product candidates, patents protecting such candidates might expire before or shortly after such candidates are commercialized. As a result, our intellectual property may not provide us with sufficient rights to exclude others from commercializing products similar or identical to ours. In such circumstances we would be relying primarily on regulatory or marketing exclusivity to exclude others from commercializing a generic version of our products.
We may become involved in lawsuits to protect or enforce our patents and other intellectual property rights, which could be expensive, time consuming and unsuccessful.
Competitors may infringe our patents and other intellectual property rights. To counter infringement or unauthorized use, we may be required to file infringement claims, which can be expensive and time consuming. In addition, in an infringement proceeding, a court may decide that a patent of ours is invalid or unenforceable, or may refuse to stop the other party from using the technology at issue on the grounds that our patents do not cover the technology in question. An adverse result in any litigation proceeding could put one or more of our patents at risk of being invalidated or interpreted narrowly. Furthermore, because of the substantial amount of discovery required in connection with intellectual property litigation, there is a risk that some of our confidential information could be compromised by disclosure during this type of litigation.
Third parties may initiate legal proceedings alleging that we or our collaborators are infringing their intellectual property rights, the outcome of which would be uncertain and could have a material adverse effect on the success of our business.
The biotechnology and pharmaceutical industries are characterized by extensive litigation regarding patents and other intellectual property rights. Our commercial success depends upon our ability and the ability of our collaborators to develop, manufacture, market and sell our product and product candidates and use our proprietary technologies without infringing the proprietary rights and intellectual property of third parties. The biotechnology and pharmaceutical industries are characterized by extensive litigation regarding patents and

other intellectual property rights. We have in the past and may in the future become party to, or threatened with, adversarial proceedings or litigation regarding intellectual property rights with respect to our medicines and technology, including opposition, derivation, revocation, reexamination, post-grant and inter partes review or interference proceedings before the PTO. For example, in 2011, The Leonard and Madlyn Abramson Family Cancer Research Institute atUSPTO or other patent offices around the Abramson Cancer Center of the University of Pennsylvania initiated a lawsuit against us, one of our founders, Craig B. Thompson, M.D., and Celgene, alleging misappropriation of intellectual property and, in 2012, the Trustees of the University of Pennsylvania initiated a similar lawsuit against us and Dr. Thompson. Each of these lawsuits was settled in 2012.world. We are not aware of any other legal proceedings having been filed against us following the sale of our oncology business to date.Servier. Third parties may assert infringement claims against us based on existing patents or patents that may be granted in the future. If we or one of our collaborators are found to infringe a third party’s intellectual property rights, we or they could be required to obtain a license from such third party to continue developing and marketing our medicines and technology. However, we or our collaborators may not be able to obtain any required license on commercially reasonable terms or at all. Even if we or our collaborators were able to obtain a license, it could be non-exclusive, thereby giving our competitors and other third parties access to the same technologies licensed to us. We or our collaborators could be forced, including by court order, to cease developing and commercializing the infringing technology or medicine. In addition, we or our collaborators could be found liable for monetary damages. A finding of infringement could prevent us or our collaborators from commercializing our product and product candidates or force us to cease some of our business operations, which could materially harm our business. Claims that we or our collaborators have misappropriated the confidential information or trade secrets of third parties could have a similar negative impact on our business.

We may be subject to claims that our employees have wrongfully used or disclosed alleged trade secrets of their former employers.
Many of our employees, consultants or advisors are currently or were previously employed at universities or other biotechnology or pharmaceutical companies, including our competitors or potential competitors. Although we try to ensure that our employees, consultants and advisors do not use the proprietary information or know-how of others in their work for us, we may be subject to claims that we or these individuals have used or disclosed intellectual property, including trade secrets or other proprietary information, of any such individual’s current or former employer. Litigation may be necessary to defend against these claims. If we fail in defending any such claims, in addition to paying monetary damages, we may lose valuable
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intellectual property rights or personnel. Even if we are successful in defending against such claims, litigation could result in substantial costs and be a distraction to our management.organization.

Intellectual property litigation could cause us to spend substantial resources and distract our personnel from their normal responsibilities.
Even if resolved in our favor, litigation or other legal proceedings relating to intellectual property claims may cause us to incur significant expenses, and could distract our technical and management personnel from their normal responsibilities. In addition, there could be public announcements of the results of hearings, motions or other interim proceedings or developments and if securities analysts or investors perceive these results to be negative, it could have a substantial adverse effect on the price of our common stock. Such litigation or proceedings could substantially increase our operating losses and reduce the resources available for development activities or any future sales, marketing or distribution activities. We may not have sufficient financial or other resources to adequately conduct such litigation or proceedings. Some of our competitors may be able to sustain the costs of such litigation or proceedings more effectively than we can because of their greater financial resources and more mature and developed intellectual property portfolios. Uncertainties resulting from the initiation and continuation of patent litigation or other proceedings could have a material adverse effect on our ability to compete in the marketplace.

If we are unable to protect the confidentiality of our trade secrets,confidential information related to our proprietary platforms and technology, our business and competitive position wouldcould be harmed.
In addition to seeking patents for some of our technology and medicines, we also rely on trade secrets, includingmaintaining the confidentiality of unpatented know-how, technology and other proprietary information, to maintain our competitive position. With respectFor example, we consider the confidential information and know-how related to our proprietary cellular metabolism technology platform we consider trade secrets and know-how to be our primary intellectual property. Trade secretsproperty assets in this space. Unpatented proprietary technical information and know-how can be difficult to protect. In particular, we anticipate that with respect to this technology platform, these trade secrets and know-how will over time be disseminated within the industry through independent development, the publication of journal articles describing the methodology, and the movement of personnel skilled in the art from academic to industry scientific positions.
We seek to protect these trade secrets,this proprietary technical information and know-how, in part, by entering into non-disclosure and confidentiality agreements with parties who have access to them, such as our employees, corporate collaborators, outside scientific collaborators, contract research organizations, contract manufacturers, consultants, advisors and other third parties. We also enter into confidentiality and invention or patent assignment agreements with our employees and consultants. Despite these efforts, any of these parties may breach the agreements and disclose our proprietary information, including our trade secrets, and we may not be able to obtain adequate remedies for such breaches. Enforcing a claim that a party illegally disclosed or misappropriated a trade secretproprietary information is difficult, expensive and time-consuming, and the outcome is unpredictable. In addition, some courts inside and outside the United States are less willing or unwilling to protect trade secrets. If any of our trade secretsproprietary technical information and know-how were to be lawfully obtained or

independently developed by a competitor or other third party, we would have no right to prevent them from using that technology or information to compete with us. If anyMoreover, we anticipate that with respect to this platform, at least some of our trade secrets werethis technical information and know-how will, over time, be disseminated within the industry through independent development, the publication of journal articles describing the methodology, and the movement of personnel skilled in the art from academic to be disclosed to or independently developed by a competitor or other third party, our competitive position would be harmed.industry scientific positions.
Risks Related to Regulatory Approval of Our Product Candidates and Other Legal Compliance Matters
Even if we complete necessary preclinical studies and clinical trials, the marketing approval process is expensive, time-consuming and uncertain and may prevent us from obtaining approvals for the commercialization of some or all of our product candidates. If we or our collaborators are not able to obtain, or if there are delays in obtaining, required regulatory approvals, we or they will not be able to commercialize, or will be delayed in commercializing, our product candidates, and our ability to generate revenue will be materially impaired.
Our product candidates and the activities associated with their development and commercialization, including their design, testing, manufacture, safety, efficacy, recordkeeping,record keeping, labeling, storage, approval, advertising, promotion, sale and distribution, export and import, are subject to comprehensive regulation by the FDA and other regulatory agencies in the United States and by the EMA and comparable regulatory authorities in other countries. With the exception of IDHIFA®, we and our collaborators have not received approval to market any of our product candidates from regulatory authorities in any jurisdiction. In December 2017, we submitted an NDA to the FDA for ivosidenib in IDH1 mutant-positive R/R AML, and we plan to submit an MAA to the EMA for ivosidenib for IDH1 mutant-positive R/R AML in the fourth quarter of 2018. Failure to obtain marketing approval for a product candidate will prevent us from commercializing the product candidate. We have only limited experience in filing and supporting the applications necessary to gain marketing approvals and expect to rely on third-party contract research organizations to assist us in this process.
Securing marketing approval requires the submission of extensive preclinical and clinical data and supporting information to the various regulatory authorities for each therapeutic indication to establish the product candidate’s safety and efficacy. Securing regulatory approval also requires the submission of information about the product manufacturing process to, and inspection of manufacturing facilities by, the relevant regulatory authority. Our product candidates may not be effective, may be only moderately effective or may prove to have undesirable or unintended side effects, toxicities or other characteristics that may preclude our obtaining marketing approval or prevent or limit commercial use.
In addition, varying interpretations of the data obtained from preclinical and clinical testing could delay, limit or prevent marketing approval of a product candidate. Any marketing approval we or our collaborators ultimately obtain may be limited or subject to restrictions or post-approval commitments that render the approved medicine not commercially viable.
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The FDA, EMA and other foreign regulatory authorities have substantial discretion in the approval process. Accordingly, it is possible that the FDA or EMA may refuse to accept for substantive review any NDA, sNDA or MAA that we submit for our product candidates, or may conclude after review of our data that our marketing application is insufficient to obtain marketing approval of our product candidates. If the FDA or EMA does not accept or approve our applications for any of our product candidates, the applicable regulator may require that we conduct additional clinical trials, preclinical studies or manufacturing validation studies and submit that data before reconsidering our applications. Depending on the extent of these or any other FDA- or EMA-required trials or studies, approval of any marketing applications that we submit may be delayed by several years, or may require us to expend more resources than we planned. It is also possible that additional trials or studies, if performed and completed, may not be considered sufficient by the FDA or EMA to approve any marketing applications. We may not be successful in obtaining FDA or EMA approval of our product candidates on a timely basis, or ever. We have limited experience in filing and supporting the applications necessary to gain marketing approvals and expect to rely on third-party contract research organizations to assist us in this process, and failure to obtain marketing approval for our product candidates will prevent us from commercializing the product candidate in the applicable jurisdictions.
Further, the process of obtaining marketing approvals, both in the United States and abroad, is expensive, may take many years if additional clinical trials are required, if approval is obtained at all, and can vary substantially based upon a variety of factors, including the type, complexity and novelty of the product candidates involved. Changes in marketing approval policies during the development period, changes in or the enactment of additional statutes or regulations, or changes in regulatory review for each submitted product application, may cause delays in the approval or rejection of an application. The
Disruptions at the FDA and comparable authorities in other countriesagencies may prolong the time necessary for regulatory submissions to be reviewed and/or new drugs to be approved by necessary government agencies, which would adversely affect our business. For example, over the last several years, the U.S. government has shut down several times and certain regulatory agencies, such as the FDA, have substantial discretion inhad to furlough critical employees and stop critical activities. If a prolonged government shutdown were to occur, it could significantly impact the approval process and may refuse to accept any application we submit, including our recently filed NDA for ivosidenib, or may decide that our data is insufficient for approval and require additional preclinical, clinical or other studies. In addition, varying interpretationsability of the data obtained from preclinicalFDA to timely review and clinical testingprocess our regulatory submissions, which could delay, limit or prevent marketinghave a material adverse effect on our business. For example, should the FDA determine that an inspection is necessary for approval of a product candidate. Any marketing approval weregulatory submission and an inspection cannot be completed during the review cycle, and the FDA does not determine a remote interactive evaluation to be adequate, the FDA has stated that it generally intends to issue a complete response letter or defer action on the regulatory submission until an inspection can be completed.
Finally, our collaborators ultimately obtainability to develop and market new drug products may be limitedthreatened by the results of ongoing litigation challenging the FDA’s approval of another company’s drug. Specifically, in April 2023, the U.S. District Court for the Northern District of Texas invalidated the approval by the FDA of mifepristone, a drug product which was originally approved in 2000 and whose distribution is governed by various measures adopted under a REMS. In reaching that decision, the district court made a number of findings that may negatively impact the development, approval and distribution of new drug products in the United States.
The Court of Appeals for the Fifth Circuit declined to order the removal of mifepristone from the market, finding that a challenge to the FDA’s initial approval in 2000 is barred by the statute of limitations. But the Court of Appeals for the Fifth Circuit did hold that plaintiffs were likely to prevail in their claim that changes allowing for expanded access of mifepristone that the FDA authorized in 2016 and 2021 were arbitrary and capricious. In December 2023, the Supreme Court announced that it will review the appeals court decision. Depending on the outcome of this litigation and the regulatory uncertainty it has engendered, our ability to develop new drug product candidates and to maintain approval of existing drug products and measures adopted under a REMS is at risk and our efforts to develop and market new drug products could be delayed, undermined or subject to restrictions or post-approval commitments that render the approved medicine not commercially viable.protracted litigation.
Accordingly, ifIf we or our collaborators experience delays in obtaining approval or if we or they fail to obtain approval of our product candidates, the commercial prospects for our product candidates may be harmed and our ability to generate revenue will be materially impaired.
Failure to obtain marketing approval in foreign jurisdictions would prevent our medicines from being marketed in such jurisdictions.jurisdictions and any of our medicines that are approved for marketing in such jurisdiction will be subject to risk associated with foreign operations.
In order to market and sell our medicines in the E.U.EU and many other foreign jurisdictions, we or our collaborators must obtain separate marketing approvals and comply with numerous and varying regulatory requirements. The approval procedure varies among countries and can involve additional testing. The time required to obtain approval may differ substantially from that required to obtain FDA approval. The regulatory approval process outside the United States generally includes all of the risks associated with obtaining FDA approval. In addition, in many countries outside the United States, a product must be approved for reimbursement before the product can be approved for sale in that country. We or our collaborators may not obtain approvals from regulatory authorities outside the United States on a timely basis, if at all. In particular, although we plan to file an MAA with EMA for ivosidenib in the future, we may not be successful in obtaining EMA approval of ivosidenib on a timely basis, or ever. Moreover, approval by the FDA does not ensure approval by regulatory authorities in other countries or jurisdictions, and approval by one regulatory authority
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outside the United States does not ensure approval by regulatory authorities in other countries or jurisdictions or by the FDA. WeAlthough we have received marketing authorization for PYRUKYND® for the treatment of adults with PK deficiency in the EU and Great Britain, we may not be able to file for additional marketing approvals and may not receive necessary approvals to commercialize our medicines in any other foreign market.

Additionally, on June 23, 2016, the electoratewe could face heightened risks with respect to seeking marketing approval in the United Kingdom voted in favoras a result of leaving the E.U.,withdrawal of the United Kingdom from the EU on December 31, 2020, commonly referred to as Brexit. On March 29, 2017, the country formally notified the E.U. of its intention to withdraw pursuant to Article 50 of the Lisbon Treaty. Since a significant proportion of the regulatory framework for pharmaceutical products in the United Kingdom covering the quality, safety, and efficacy of pharmaceutical products, clinical trials, marketing authorization, commercial sales, and distribution of pharmaceutical products is derived from E.U.EU directives and regulations, the referendum could materiallyconsequences of Brexit and the impact on the future regulatory regime with respectthat applies to products and the approval of our product candidates in the United Kingdom remains unclear. As of January 1, 2021, the Medicines and Healthcare products Regulatory Agency, or the E.U.MHRA, became responsible for supervising medicines and medical devices in Great Britain, comprising England, Scotland and Wales under domestic law, whereas Northern Ireland will continue to be subject to EU rules under the Northern Ireland Protocol. The United Kingdom and the EU have however agreed to the Windsor Framework which fundamentally changes the existing system under the Northern Ireland Protocol, including with respect to the regulation of medicinal products in the United Kingdom. Once implemented, the changes introduced by the Windsor Framework will result in the MHRA being responsible for approving all medicinal products destined for the United Kingdom market (Great Britain and Northern Ireland), and the EMA will no longer have any role in approving medicinal products destined for Northern Ireland. Any delay in obtaining, or an inability to obtain, any marketing approvals, as a result of Brexit or otherwise, wouldmay prevent us from commercializing ourany product candidates in the United Kingdom and/or the E.U.EU and restrict our ability to generate revenue and achieve and sustain profitability. If any of these outcomes occur, we may be forcedforce us to restrict or delay efforts to seek regulatory approval in the United Kingdom, and/or E.U. for our product candidates, which could significantly and materially harm our business.
A fastIn addition, foreign regulatory authorities may change their approval policies and new regulations may be enacted. For instance, the European Union pharmaceutical legislation is currently undergoing a complete review process, in the context of the Pharmaceutical Strategy for Europe initiative, launched by the European Commission in November 2020. The European Commission’s proposal for revision of several legislative instruments related to medicinal products (including potentially reducing the duration of regulatory data protection and revising the eligibility for expedited pathways) was published on April 26, 2023. The proposed revisions remain to be agreed and adopted by the European Parliament and European Council and the proposals may therefore be substantially revised before adoption, which is not anticipated before early 2026. The revisions may however have a significant impact on the pharmaceutical industry and our business in the long term.
We expect that we will be subject to additional risks in commercializing any of our product candidates that receive marketing approval outside the United States, including tariffs, trade barriers and regulatory requirements; economic weakness, including inflation, or political instability in particular foreign economies and markets; compliance with tax, employment, immigration and labor laws for employees living or traveling abroad; foreign currency fluctuations, which could result in increased operating expenses and reduced revenue, and other obligations incident to doing business in another country; and workforce uncertainty in countries where labor unrest is more common than in the United States. In addition, we do not have experience commercializing products outside of the United States and such efforts may depend on our ability to find a suitable collaborator.
Fast track designation and/or priority review designation by the FDA or PRIME designation in the EU may not actually lead to a faster development or regulatory review or approval process, nor does it assure approval of the product candidate by FDA.the FDA or the EMA.
In the United States, IDHIFA® and ivosidenib receivedWe may seek fast track designation, priority review designation and/or PRIME designation for treatment of patients with AML that harbor an IDH2 and IDH1 mutation, respectively. our product candidates.
If a drugproduct candidate is intended for the treatment of a serious or life-threatening disease or condition and the drugproduct candidate demonstrates the potential to address unmet medical needs for this disease or condition, the drug sponsor may apply for FDA fast track designation.
Further, if the FDA determines that a product candidate offers major advances in treatment or provides a treatment where no adequate therapy exists, the FDA may designate the product candidate for priority review. A priority review designation means that the goal for the FDA to review an application is six months, rather than the standard review period of ten months. Receiving priority review from the FDA does not guarantee approval within the six-month review cycle or thereafter.
The FDA has broad discretion on whether or not to grant fast track designation and/or priority review designation to a product candidate, so even if we believe a particular product candidate is eligible for such designation or status, the FDA may decide not to grant it. Even if our product candidates receive fast track designation and/or priority review designation, we may not experience a faster development process, review or approval, if at all, compared to conventional FDA procedures. The FDA
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may withdraw fast track designation if it believes that the designation is no longer supported by data from our clinical development program.
In addition, in the EU, the PRIME designation program focuses on product candidates that target conditions for which there exists no satisfactory method of treatment in the EU or product candidates that may offer a major therapeutic advantage over existing treatments. The benefits of a PRIME designation include, among other things, the potential to qualify product for accelerated review, meaning reduction in the review time for an opinion on approvability to be issued earlier in the application process. PRIME designation enables a sponsor to request parallel EMA scientific advice and health technology assessment advice to facilitate timely market access. Even if our product candidates receive PRIME designation, we may not experience a faster development process, review or approval compared to conventional EMA procedures and it does not assure or increase the likelihood of the EMA’s grant of a marketing authorization.
We, or any future collaborators, may not be able to obtain orphan drug designation or orphan drug exclusivity for our drug candidates and, even if we do, that exclusivity may not prevent the FDA or the EMA from approving competing drugs.
Regulatory authorities in some jurisdictions, including the United States and Europe, may designate drugs and biologics for relatively small patient populations as orphan drugs. Under the Orphan Drug Act, the FDA may designate a product as an orphan drug if it is a drug or biologic intended to treat a rare disease or condition, which is generally defined as a patient population of fewer than 200,000 individuals annually in the United States.
Generally, if a product with an orphan drug designation subsequently receives the first marketing approval for the indication for which it has such designation, the product is entitled to a period of marketing exclusivity, which precludes the EMA or the FDA from approving another marketing application for the same product for that time period. The applicable period is seven years in the United States and ten years in Europe. The European exclusivity period can be reduced to six years if a product no longer meets the criteria for orphan drug designation or if the product is sufficiently profitable so that market exclusivity is no longer justified. Orphan drug exclusivity may be lost if the FDA or EMA determines that the request for designation was materially defective or if the manufacturer is unable to assure sufficient quantity of the product to meet the needs of patients with the rare disease or condition. Moreover, even after an orphan drug is approved, the FDA can subsequently approve a different product for the same condition if the FDA concludes that the later product is clinically superior in that it is shown to be safer, more effective or makes a major contribution to patient care.
On August 3, 2017, the Congress passed the FDA Reauthorization Act of 2017 (FDARA). FDARA, among other things, codified the FDA’s pre-existing regulatory interpretation, to require that a drug sponsor demonstrate the clinical superiority ofIn addition, even after an orphan drug that is otherwiseapproved, the same asFDA can subsequently approve a previously approved drugdifferent product for the same rare disease in order to receive orphan drug exclusivity. The new legislation reverses prior precedent holdingcondition if the FDA concludes that the Orphan Drug Act unambiguously requireslater product is clinically superior in that theit is shown to be safer, more effective or makes a major contribution to patient care.
The FDA recognize the orphan exclusivity period regardless of a showing of clinical superiority. The FDAand Congress may further reevaluate the Orphan Drug Act and its regulations and policies. This may be particularly true in light of a decision from the Court of Appeals for the 11th Circuit in September 2021 finding that, for the purpose of determining the scope of exclusivity, the term “same disease or condition” means the designated “rare disease or condition” and could not be interpreted by the FDA to mean the “indication or use.” Although there have been legislative proposals to overrule this decision, they have not been enacted into law. On January 23, 2023, the FDA announced that, in matters beyond the scope of that court order, the FDA will continue to apply its existing regulations tying orphan-drug exclusivity to the uses or indications for which the orphan drug was approved. We do not know if, when, or how the FDA or Congress may change the orphan drug regulations and policies in the future, and it is uncertain how any changes might affect our business. Depending on what changes the FDA may make to its orphan drug regulations and policies, our business could be adversely impacted.
Any product or product candidate for which we or our collaborators obtain marketing approval could be subject to restrictions or withdrawal from the market and we may be subject to substantial penalties if we fail to comply with regulatory requirements or if we experience unanticipated problems with our medicines, when and if any of them are approved.
Any product or product candidate for which we or our collaborators obtain marketing approval, along with the manufacturing processes, post-approval clinical data, labeling, advertising and promotional activities for such medicine, will be subject to continual requirements of and review by the FDA and other regulatory authorities. These requirements include submissions of safety and other post-marketing information and reports, registration and listing requirements, cGMP requirements relating to quality control and manufacturing, quality assurance and corresponding maintenance of records and documents, and requirements regarding the distribution of samples to physicians and recordkeeping.record keeping. Even if marketing approval of a product candidate is granted, the approval may be subject to limitations on the indicated uses for which the medicine may be marketed or to the conditions of approval, or contain requirements for costly post-marketing testing and surveillance to monitor the safety or efficacy of the medicine, including the requirement to implement a risk evaluation and mitigation strategy.

The FDA and other agencies, including the Department of Justice, or the DOJ, closely regulate and monitor the post-approval marketing and promotion of products to ensure that they are marketed and distributed only for the approved indications and in accordance with the provisions of the approved labeling. The FDA and DOJ impose stringent restrictions on manufacturers’ communications regarding off-label use and if we do not market our medicines for uses other than their respective approved indications, we may be
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subject to enforcement actionactions for off-label marketing. Violations of the Federal Food, Drug, and Cosmetic ActFDCA and other statutes, including the False Claims Act, relating to the promotion and advertising of prescription drugs may lead to investigations and enforcement actions alleging violations of federal and state health care fraud and abuse laws, as well as state consumer protection laws.
In addition, later discovery of previously unknown adverse events or other problems with our medicines, manufacturers or manufacturing processes, or failure to comply with regulatory requirements,laws, which violations may yield various results, including:
restrictions on such medicine, manufacturers or manufacturing processes;
restrictions on the labeling or marketing of a medicine;
restrictions on distribution or use of a medicine;
requirements to conduct post-marketing studies or clinical trials;
warning letters or untitled letters;
withdrawal of the medicine from the market;
refusal to approve pending applications or supplements to approved applications that we submit;
recall of medicines;
damage to relationships with any potential collaborators;
unfavorable press coverage and damage to our reputation;
fines, restitution or disgorgement of profits or revenue;
suspension or withdrawal of marketing approvals;
refusal to permit the import or export of our medicines;
product seizure;
injunctions orresult in the imposition of significant administrative, civil orand criminal penalties; and
litigation involving patients using our medicines.
Non-compliance with E.U. requirements regarding safety monitoring or pharmacovigilance, and with requirements related to the development of products for the pediatric population, can also result in significant financial penalties. Similarly, failure to comply with the E.U. requirements regarding the protection of personal information can also lead to significant penalties and sanctions.
Our relationships with healthcare providers, physicians and third-party payors will beare subject to applicable anti-kickback, fraud and abuse and other healthcare laws and regulations, which, in the event of a violation, could expose us to criminal sanctions, civil penalties, contractual damages, reputational harm and diminished profits and future earnings.
Healthcare providers, physicians and third-party payors will play a primary role in the recommendation and prescription of PYRUKYND® and any product candidates for which we obtain marketing approval. Our future arrangements with healthcare providers, physicians and third-party payors may expose us to broadly applicable fraud and abuse and other healthcare laws and regulations that may constrain the business or financial arrangements and relationships through which we market, sell and distribute PYRUKYND® and any other medicines for which we obtain marketing approval. Restrictions under applicable federal and state healthcare laws and regulations include the following:
the federal Anti-Kickback Statute prohibits, among other things, persons from knowingly and willfully soliciting, offering, receiving or providing remuneration, directly or indirectly, in cash or in kind, to induce or reward, or in return for, either the referral of an individual for, or the purchase, order or recommendation or arranging of, any good or service, for which payment may be made under a federal healthcare program such as Medicare and Medicaid;
the federal False Claims Act imposes criminal and civil penalties, including through civil whistleblower or qui tam actions, against individuals or entities for, among other things, knowingly presenting, or causing to be presented, false or fraudulent claims for payment by a federal healthcare program or making a false statement or record material to payment of a false claim or avoiding, decreasing or concealing an obligation to pay money

to the federal government, with potential liability including mandatory treble damages and significant per-claim penalties, currently set at $10,781.40 to $21,562.80 per false claim;penalties;
the federal Health Insurance Portability and Accountability Act of 1996, or HIPAA, imposes criminal and civil liability for executing a scheme to defraud any healthcare benefit program or making false statements relating to healthcare matters;
HIPAA, as amended by the Health Information Technology for Economic and Clinical Health Act and its implementing regulations, also imposes obligations, including mandatory contractual terms, with respect to safeguarding the privacy, security and transmission of individually identifiable health information;
the federal Physician Payments Sunshine Act requires applicable manufacturers of covered drugs to report payments and other transfers of value to physicians and teaching hospitals;hospitals and other covered recipients; and
analogous state and foreign laws and regulations, such as state anti-kickback and false claims laws and transparency statutes, may apply to sales or marketing arrangements and claims involving healthcare items or services reimbursed by non-governmental third-party payors, including private insurers.
Some state laws require pharmaceutical companies to comply with the pharmaceutical industry’s voluntary compliance guidelines and the relevant compliance guidance promulgated by the federal government and may require drug manufacturers to report information related to payments and other transfers of value to physicians and other healthcare providers or marketing expenditures. State and foreign laws also govern the privacy and security of health information in some circumstances, many of which differ from each other in significant ways and often are not preempted by HIPAA, thus complicating compliance efforts.
Efforts to ensure that our business arrangements with third parties will comply with applicable healthcare laws and regulations will involve substantial costs. It is possible that governmental authorities will conclude that our business practices may not comply with current or future statutes, regulations or case law involving applicable fraud and abuse or other healthcare laws and regulations. If our operations are found to be in violation of any of these laws or any other governmental regulations that may apply to us, we may be subject to significant civil, criminal and administrative penalties, damages, fines, imprisonment, exclusion of products from government funded healthcare programs, such as Medicare and Medicaid, and the curtailment or restructuring of our operations. If any of the physicians or other healthcare providers or entities with whom we expect to do business are found to be not in compliance with applicable laws, they may be subject to criminal, civil or administrative sanctions, including exclusions from government funded healthcare programs.
UnderThe provision of benefits or advantages to physicians to induce or encourage the CURESprescription, recommendation, endorsement, purchase, supply, order or use of medicinal products is also prohibited in the EU. The provision of benefits or advantages to physicians is governed by the national anti-bribery laws of EU Member States, such as the U.K. Bribery Act 2010. Infringement of these laws could result in substantial fines and imprisonment.
Payments made to physicians in certain EU Member States must be publicly disclosed. Moreover, agreements with physicians often must be the Trump Administration’ssubject of prior notification and approval by the physician’s employer, his or her competent professional
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organization and/or the regulatory reform initiatives,authorities of the FDA’s policies,individual EU Member States. These requirements are provided in the national laws, industry codes or professional codes of conduct, applicable in the EU Member States. Failure to comply with these requirements could result in reputational risk, public reprimands, administrative penalties, fines or imprisonment.
PYRUKYND® or any product candidate that we commercialize may become subject to unfavorable pricing regulations and guidance may be revised or revoked and that could prevent, limit or delay regulatory approval of our product candidates,third-party reimbursement practices, which would impactharm our abilitybusiness.
We have built our commercial infrastructure to generate revenue.
In December 2016,support the 21st Century Cures Act, or Cures Act, was signed into law. The Cures Act, among other things, is intendedcommercial launch of PYRUKYND® in adult PK deficiency in the United States. We are providing access to modernizePYRUKYND® free of charge for eligible patients in the regulation of drugsEU and spur innovation, but its ultimate implementation is unclear. If we are slow or unable to adapt to changes in existing requirements or the adoption of new requirements or policies, or if we are not able to maintain regulatory compliance, we may lose any marketing approval that we may have obtainedGreat Britain through a global managed access program, and we may not achieveprovide access to PYRUKYND® for adult patients with PK deficiency in other jurisdictions through the global managed access program on either a free of charge or sustain profitability, which would adversely affect our business, prospects, financial condition and resultsfor charge basis. The commercial success of operations.
We also cannot predict the likelihood, naturePYRUKYND® or extent of government regulation that may arise from future legislation or administrative or executive action, either in the United States or abroad. For example, certain policies of the Trump administration may impact our business and industry. Namely, the Trump administration has taken several executive actions, including the issuance of a number of Executive Orders, that could impose significant burdens on, or otherwise materially delay, the FDA’s ability to engage in routine regulatory and oversight activities such as implementing statutes through rulemaking, issuance of guidance, and review and approval of marketing applications. An under-staffed FDA could result in delays in the FDA’s responsiveness or in its ability to review submissions or applications, issue regulations or guidance, or implement or enforce regulatory requirements in a timely fashion or at all. Moreover, on January 30, 2017, President Trump issued an Executive Order, applicable to all executive agencies, including the FDA, which requires that for each notice of proposed rulemaking or final regulation to be issued in fiscal year 2017, the agency shall identify at least two existing regulations to be repealed, unless prohibited by law. These requirements are referred to as the “two-for-one” provisions. This Executive Order includes a budget neutrality provision that requires the total incremental cost of all new regulations in the 2017 fiscal year, including repealed regulations, to be no greater than zero, except in limited circumstances. For fiscal years 2018 and beyond, the Executive Order requires agencies to identify regulations to offset any incremental cost of a new regulation and approximate the total costs or savings associated with each new regulation or repealed regulation. In interim guidance issued by the Office of Information and Regulatory Affairs within OMB on February 2, 2017, the administration indicates that the “two-for-one” provisions may apply not only to agency regulations, but also to significant agency guidance documents. In addition, on February 24, 2017, President Trump issued an executive order directing each affected agency to designate an agency official as a “Regulatory Reform Officer” and establish a “Regulatory Reform Task Force” to implement the two-for-one provisions

and other previously issued executive orders relating to the review of federal regulations, however it is difficult to predict how these requirements will be implemented, and the extent to which they will impact the FDA’s ability to exercise its regulatory authority. If these executive actions impose constraints on the FDA’s ability to engage in oversight and implementation activities in the normal course, our business may be negatively impacted.
Current and future legislation may increase the difficulty and cost for us and any future collaborators to obtain marketing approval and commercialize our drug candidates and affect the prices we, or they, may obtain.
In the United States and some foreign jurisdictions, there have been a number of legislative and regulatory changes and proposed changes regarding the healthcare system that could, among other things, prevent or delay marketing approval of our drug candidates, restrict or regulate post-approval activities and affect our ability, or the ability of any future collaborators, to profitably sell any drugs for which we, or they, obtain marketing approval. We expect that current laws, as well as other healthcare reform measures that may be adopted in the future, may result in more rigorous coverage criteria and in additional downward pressure on the price that we, or any future collaborators, may receive for any approved drugs.
Among the provisions of the Patient Protection and Affordable Care Act, or ACA, of potential importance to our business and our drug candidates are the following:
an annual, non-deductible fee on any entity that manufactures or imports specified branded prescription drugs and biologic agents;
an increase in the statutory minimum rebates a manufacturer must pay under the Medicaid Drug Rebate Program;
expansion of healthcare fraud and abuse laws, including the civil False Claims Act and the federal Anti-Kickback Statute, new government investigative powers and enhanced penalties for noncompliance;
a new Medicare Part D coverage gap discount program, in which manufacturers must agree to offer 50% point-of-sale discounts off negotiated prices to eligible beneficiaries during their coverage gap period, as a condition for a manufacturer’s outpatient drugs to be covered under Medicare Part D;
extension of manufacturers’ Medicaid rebate liability;
expansion of eligibility criteria for Medicaid programs;
expansion of the entities eligible for discounts under the Public Health Service pharmaceutical pricing program;
new requirements to report certain financial arrangements with physicians and teaching hospitals;
a new requirement to annually report drug samples that manufacturers and distributors provide to physicians; and
a new Patient-Centered Outcomes Research Institute to oversee, identify priorities in, and conduct comparative clinical effectiveness research, along with funding for such research.
Other legislative changes have been proposed and adopted since the PPACA was enacted. These changes include the Budget Control Act of 2011, which, among other things, led to aggregate reductions to Medicare payments to providers of up to 2% per fiscal year that started in 2013 and will stay in effect through 2024 unless additional Congressional action is taken, and the American Taxpayer Relief Act of 2012, which, among other things, reduced Medicare payments to several types of providers and increased the statute of limitations period for the government to recover overpayments to providers from three to five years. These new laws may result in additional reductions in Medicare and other healthcare funding and otherwise affect the prices we may obtain for any of our product candidates forwill depend substantially, both domestically and abroad, on the extent to which we may obtain regulatory approval or the frequency with which any such product candidate is prescribed or used. Further, there have been several recent U.S. congressional inquiries and proposed state and federal legislation designed to, among other things, bring more transparency to drug pricing, review the relationship between pricing and manufacturer patient programs, reduce the costs of drugs under Medicare and reformour product candidates will be paid by third-party payors, including government program reimbursement methodologies for drug products.
We expect that these healthcare reforms, as well as other healthcare reform measures that may be adopted in the future, may result in additional reductions in Medicare and other healthcare funding, more rigorous coverage criteria, new payment methodologies and additional downward pressure on the price that we receive for any approved product and/or the level of reimbursement physicians receive for administering any approved product we might bring to market. Reductions in reimbursement levels may negatively impact the prices we receive or the frequency with which our products are prescribed or administered. Any reduction in reimbursement from Medicare or other government programs may result in a similar reduction in payments from private payors. Since enactment of the ACA, there have been numerous legal challenges and Congressional actions to repeal and replace provisions of the law. In May 2017, the U.S. House of Representatives passed legislation known as the American Health Care Act of 2017. Thereafter, the Senate Republicans introduced and then updated a bill to replace the

ACA known as the Better Care Reconciliation Act of 2017. The Senate Republicans also introduced legislation to repeal the ACA without companion legislation to replace it, and a “skinny” version of the Better Care Reconciliation Act of 2017. In addition, the Senate considered proposed healthcare reform legislation known as the Graham-Cassidy bill. None of these measures was passed by the U.S. Senate.
The Trump Administration has also taken executive actions to undermine or delay implementation of the ACA. In January 2017, President Trump signed an Executive Order directing federal agencies withhealth administration authorities and responsibilities underprivate health coverage insurers. If coverage and reimbursement is not available, or reimbursement is available only to limited levels, we, or any collaborators, may not be able to successfully commercialize PYRUKYND® or our product candidates. Even if coverage is provided, the ACAapproved reimbursement amount may not be high enough to waive, defer, grant exemptionsallow us, or any future collaborators, to establish or maintain pricing sufficient to realize a sufficient return on our or their investments. In the United States, no uniform policy of coverage and reimbursement for products exists among third-party payors and coverage and reimbursement for products can differ significantly from or delaypayor to payor. As a result, the implementation of any provision of the ACAcoverage determination process is often a time-consuming and costly process that would impose a fiscal or regulatory burden on states, individuals, healthcare providers, health insurers, or manufacturers of pharmaceuticals or medical devices. In October 2017, the President signed a second Executive Order allowingwill require us to provide scientific and clinical support for the use of association health plansour products to each payor separately, with no assurance that coverage and short-term health insurance, which may provide fewer health benefits thanadequate reimbursement will be applied consistently or obtained in the plans sold through the ACA exchanges. At the same time, the Administration announced that it will discontinue the paymentfirst instance.
There is significant uncertainty related to third-party payor coverage and reimbursement of cost-sharing reduction (CSR) paymentsnewly approved drugs. Marketing approvals, pricing and reimbursement for new drug products vary widely from country to insurance companies until Congress approves the appropriation of funds for such CSR payments. The losscountry. Some countries require approval of the CSR paymentssale price of a drug before it can be marketed. In many countries, the pricing review period begins after marketing or product licensing approval is expected to increase premiums on certain policies issued by qualified health plans under the ACA. A bipartisan bill to appropriate funds for CSR payments was introduced in the Senate, but the future of that bill is uncertain.
More recently, with enactment of the Tax Cuts and Jobs Act of 2017, which was signed by the President on December 22, 2017, Congress repealed the “individual mandate.” The repeal of this provision, which requires most Americans to carry a minimal level of health insurance, will become effective in 2019. According to the Congressional Budget Office, the repeal of the individual mandate will cause 13 million fewer Americans to be insured in 2027 and premiums in insurancegranted. In some foreign markets, may rise. Further, each chamber of the Congress has put forth multiple bills designed to repeal or repeal and replace portions of the ACA. Although none of these measures has been enacted by Congress to date, Congress may consider other legislation to repeal and replace elements of the ACA. The Congress will likely consider other legislation to replace elements of the ACA, during the next Congressional session.
We will continue to evaluate the effect that the ACA and its possible repeal and replacement could have on our business. It is possible that repeal and replacement initiatives, if enacted into law, could ultimately result in fewer individuals having health insurance coverage or in individuals having insurance coverage with less generous benefits. While the timing and scope of any potential future legislation to repeal and replace ACA provisions is highly uncertain in many respects, it is also possible that some of the ACA provisions that generally are not favorable for the research-basedprescription pharmaceutical industry could also be repealed along with ACA coverage expansion provisions. Accordingly, such reforms, if enacted, could have an adverse effect on anticipated revenue from product candidates that we may successfully develop and for which we may obtain marketing approval and may affect our overall financial condition and ability to develop or commercialize product candidates.
The costs of prescription pharmaceuticals in the United States has also been the subject of considerable discussion in the United States, and members of Congress and the Administration have stated that they will address such costs through new legislative and administrative measures. The pricing of prescription pharmaceuticals is alsoremains subject to continuing governmental control outside the United States.even after initial approval is granted. In these countries, pricing negotiations with governmental authorities can take considerable time after the receipt of marketing approval for a product. To obtain reimbursement or pricing approval in some countries, we may be required to conduct a clinical trial that compares the cost effectiveness of our product candidates to other available therapies. If reimbursement of our products is unavailable or limited in scope or amount, or if pricing is set at unsatisfactory levels, our ability to generate revenues and become profitable could be impaired.
Moreover, legislativeAs a result, we, or any collaborators, might obtain marketing approval for a product in a particular country, but then be subject to price regulations that delay commercial launch of the product, possibly for lengthy time periods, which may negatively impact the revenue we are able to generate from the sale of the product in that country. Adverse pricing limitations may hinder our ability or the ability of any collaborators to recoup our or their investment in one or more product candidates, even if our product candidates obtain marketing approval.
Patients who are provided medical treatment for their conditions generally rely on third-party payors to reimburse all or part of the costs associated with their treatment. Therefore, our ability, and regulatory proposalsthe ability of any collaborators, to commercialize PYRUKYND® or any of our product candidates will depend in part on the extent to which coverage and reimbursement for these products and related treatments will be available from third-party payors. Third-party payors decide which medications they will cover and establish reimbursement levels. The healthcare industry is acutely focused on cost containment, both in the United States and elsewhere. Government authorities and other third-party payors have also been madeattempted to expand post-approval requirementscontrol costs by limiting coverage and restrict salesthe amount of reimbursement for particular medications, which could affect our ability or that of any collaborators to sell PYRUKYND® or our product candidates profitably. These payors may not view our products, if any, as cost-effective, and promotional activitiescoverage and reimbursement may not be available to our customers, or those of any collaborators, or may not be sufficient to allow our products, if any, to be marketed on a competitive basis. Cost-control initiatives could cause us, or any collaborators, to decrease the price we, or they, might establish for pharmaceutical drugs.products, which could result in lower than anticipated product revenue. If the prices for our products, if any, decrease or if governmental and other third-party payors do not provide coverage or adequate reimbursement, our prospects for revenue and profitability will suffer.
In addition, increasingly, third-party payors are requiring higher levels of evidence of the benefits and clinical outcomes of new technologies and are challenging the prices charged. We cannot be sure whether additional legislative changesthat coverage will be enacted,available for PYRUKYND® or whetherany product candidate that we, or any collaborator, may commercialize and, if available, that the FDA regulations, guidance or interpretationsreimbursement rates will be changed,adequate. Further, the net reimbursement for drug products may be subject to additional reductions if there are changes to laws that presently restrict imports of drugs from countries where they may be sold at lower prices than in the United States. An inability to promptly obtain coverage and adequate payment rates from both government-funded and private payors for PYRUKYND® or what the impact of such changes on the marketing approvalsany of our product candidates for which we, or any collaborator, may obtain marketing approval could
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significantly harm our operating results, our ability to raise capital needed to commercialize products and our overall financial condition.
Current and future healthcare reform legislation may increase the difficulty and cost for us and any collaborators to obtain reimbursement and commercialize our drug candidates, if any, may be. candidates.
In addition, increased scrutiny by the United States Congressand foreign jurisdictions, there have been a number of legislative and regulatory changes and proposed changes regarding the FDA’s approval process may significantlyhealthcare system that could prevent or delay or prevent marketing approval of our product candidates, restrict or regulate post-approval activities and affect our ability, or the ability of any collaborators, to profitably sell PYRUKYND® or any other product for which we, or they, obtain marketing approval. We expect that current laws, as well as other healthcare reform measures that may be adopted in the future, may result in more rigorous coverage criteria and in additional downward pressure on the price that we, or any collaborators, may receive for any approved products. If reimbursement of our products is unavailable or limited in scope, our business could be materially harmed.
In March 2010, President Obama signed into law the Patient Protection and Affordable Care Act, as amended by the Health Care and Education Affordability Reconciliation Act, or collectively, the ACA. In August 2011, the Budget Control Act of 2011, among other things, created measures for spending reductions by Congress. This legislation resulted in aggregate reductions to Medicare payments to providers of up to 2% per fiscal year, which will remain in effect for six months into fiscal year 2032. The American Taxpayer Relief Act of 2012, among other things, reduced Medicare payments to several providers and increased the statute of limitations period for the government to recover overpayments to providers from three to five years. These laws may result in additional reductions in Medicare and other healthcare funding and otherwise affect the prices we may obtain for any of our product candidates for which we may obtain regulatory approval or the frequency with which any such product candidate is prescribed or used.
Indeed, under current legislation, the actual reductions in Medicare payments may vary up to 4%. The Consolidated Appropriations Act, which was signed into law by President Biden in December 2022, made several changes to sequestration of the Medicare program. Section 1001 of the Consolidated Appropriations Act delays the 4% Statutory Pay-As-You-Go Act of 2010, or PAYGO, sequester for two years, through the end of calendar year 2024. Triggered by enactment of the American Rescue Plan Act of 2021, the 4% cut to the Medicare program would have taken effect in January 2023. The Consolidated Appropriations Act’s health care offset title includes Section 4163, which extends the 2% Budget Control Act of 2011 Medicare sequester for six months into fiscal year 2032 and lowers the payment reduction percentages in fiscal years 2030 and 2031.
Since enactment of the ACA, there have been, and continue to be, numerous legal challenges and Congressional actions to repeal and replace provisions of the law. For example, in 2017, Congress repealed the “individual mandate.” The repeal of this provision, which requires most Americans to carry a minimal level of health insurance, became effective in 2019. On November 10, 2020, the Supreme Court heard oral arguments as to whether the individual mandate portion of the ACA is an essential and inseverable feature of the ACA, and therefore because the mandate was repealed as part of the Tax Cuts and Jobs Act, the remaining provisions of the ACA are invalid as well. On February 10, 2021, the Biden Administration withdrew the federal government’s support for overturning the ACA. On June 17, 2021, the Supreme Court struck down the lower court rulings, finding that the plaintiffs did not have standing to challenge the ACA’s minimum essential coverage provision at issue in the case.
The Trump Administration also took executive actions to undermine or delay implementation of the ACA, including directing federal agencies with authorities and responsibilities under the ACA to waive, defer, grant exemptions from, or delay the implementation of any provision of the ACA that would impose a fiscal or regulatory burden on states, individuals, healthcare providers, health insurers, or manufacturers of pharmaceuticals or medical devices. On January 28, 2021, however, President Biden revoked these Orders and issued a new Executive Order which directs federal agencies to reconsider rules and other policies that limit Americans’ access to health care, and consider actions that will protect and strengthen that access. This Executive Order also directs the U.S. Department of Health and Human Services to create a special enrollment period for the Health Insurance Marketplace in response to the recent COVID-19 pandemic. We cannot predict how federal agencies will respond to such Executive Orders.
The prices of prescription pharmaceuticals in the United States and foreign jurisdictions are subject to considerable legislative and executive actions and could impact the prices we obtain for our drug products, if and when approved, and/or the sustainability of those prices.
The prices of prescription pharmaceuticals have also been the subject of considerable discussion in the United States.
To date, there have been several recent U.S. congressional inquiries, as well as proposed and enacted state and federal legislation designed to, among other things, bring more transparency to pharmaceutical pricing, review the relationship between pricing and manufacturer patient programs, reduce the costs of drugs under Medicare and Medicaid. To those ends, President Trump issued several executive orders intended to lower the costs of prescription products. Certain provisions of these orders
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have been reflected in promulgated regulations, including an interim final rule implementing a most favored nation model for prices, which would tie Medicare Part B payments for certain physician-administered pharmaceuticals to the lowest price paid in other economically advanced countries. Such final rule has been subject to a nationwide preliminary injunction, and, on December 29, 2021, Centers for Medicare & Medicaid Services, or CMS, issued a final rule to rescind it. With the issuance of this rule, CMS stated it will explore all options to incorporate value into payments for Medicare Part B drugs and improve beneficiaries’ access to evidence-based care.
In addition, in October 2020, the HHS and the FDA published a final rule allowing states and other entities to develop a Section 804 Importation Program, or SIP, to import certain prescription drugs from Canada into the United States. That regulation was challenged in a lawsuit by the Pharmaceutical Research and Manufacturers of America, or PhRMA, but the case was dismissed by a federal district court in February 2023 after the court found that PhRMA did not have standing to sue HHS. Nine states (Colorado, Florida, Maine, New Hampshire, New Mexico, North Dakota, Texas, Vermont and Wisconsin) have passed laws allowing for the importation of drugs from Canada. Certain of these states have submitted Section 804 Importation Program proposals and are awaiting FDA approval. On January 5, 2023, the FDA approved Florida’s plan for Canadian drug importation. Further, on November 20, 2020, HHS finalized a regulation removing safe harbor protection for price reductions from pharmaceutical manufacturers to plan sponsors under Part D, either directly or through pharmacy benefit managers, unless the price reduction is required by law. The final rule would eliminate the current safe harbor for Medicare drug rebates and create new safe harbors for beneficiary point-of-sale discounts and pharmacy benefit manager service fees. It originally was set to go into effect on January 1, 2022, but with passage of the IRA, has been delayed by Congress to January 1, 2032.
The IRA has implications for Medicare Part D, which is a program available to individuals who are entitled to Medicare Part A or enrolled in Medicare Part B to give them the option of paying a monthly premium for outpatient prescription drug coverage. Among other things, the IRA requires manufacturers of certain drugs to engage in price negotiations with Medicare (beginning in 2026), with prices that can be negotiated subject to a cap; imposes rebates under Medicare Part B and Medicare Part D to penalize price increases that outpace inflation (first due in 2023); and replaces the Part D coverage gap discount program with a new discounting program (beginning in 2025). The IRA permits the Secretary of the HHS to implement many of these provisions through guidance, as opposed to regulation, for the initial years.
Specifically, with respect to price negotiations, Congress authorized Medicare to negotiate lower prices for certain costly single-source drug and biologic products that do not have competing generics or biosimilars and are reimbursed under Medicare Part B and Part D. CMS may negotiate prices for ten high-cost drugs paid for by Medicare Part D starting in 2026, followed by 15 Medicare Part D drugs in 2027, 15 Medicare Part B or Part D drugs in 2028, and 20 Medicare Part B or Part D drugs in 2029 and beyond. This provision applies to drug products that have been approved for at least 9 years and biologics that have been licensed for 13 years, but it does not apply to drugs and biologics that have been approved for a single rare disease or condition. Nonetheless, since CMS may establish a maximum price for these products in price negotiations, we would be fully at risk of government action if our products are the subject of Medicare price negotiations. Moreover, given the risk that could be the case, these provisions of the IRA may also further heighten the risk that we would not be able to achieve the expected return on our drug products or full value of our patents protecting our products if prices are set after such products have been on the market for nine years.
Further, the legislation subjects drug manufacturers to civil monetary penalties and a potential excise tax for failing to comply with the legislation by offering a price that is not equal to or less than the negotiated “maximum fair price” under the law or for taking price increases that exceed inflation. The legislation also requires manufacturers to pay rebates for drugs in Medicare Part D whose price increases exceed inflation. The new law also caps Medicare out-of-pocket drug costs at an estimated $4,000 a year in 2024 and, thereafter beginning in 2025, at $2,000 a year. In addition, the IRA potentially raises legal risks with respect to individuals participating in a Medicare Part D prescription drug plan who may experience a gap in coverage if they required coverage above their initial annual coverage limit before they reached the higher threshold, or “catastrophic period” of the plan. Individuals requiring services exceeding the initial annual coverage limit and below the catastrophic period, must pay 100% of the cost of their prescriptions until they reach the catastrophic period. Among other things, the IRA contains many provisions aimed at reducing this financial burden on individuals by reducing the co-insurance and co-payment costs, expanding eligibility for lower income subsidy plans, and price caps on annual out-of-pocket expenses, each of which could have potential pricing and reporting implications.

In June 2023, Merck filed a lawsuit against the HHS and CMS asserting that, among other things, the IRA’s Drug Price Negotiation Program for Medicare constitutes an uncompensated taking in violation of the Fifth Amendment of the Constitution. Subsequently, a number of other parties, including the U.S. Chamber of Commerce and pharmaceutical companies, also filed lawsuits in various courts with similar constitutional claims against HHS and CMS. We expect that litigation involving these and other provisions of the IRA will continue, with unpredictable and uncertain results.

Accordingly, while it is currently unclear how the IRA will be effectuated, we cannot predict with certainty what impact any federal or state health reforms will have on us, and any future collaborators tobut such changes could impose new or more stringent drug labelingregulatory requirements
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on our activities or result in reduced reimbursement for our products, any of which could adversely affect our business, results of operations and post-marketing testingfinancial condition.
At the state level, individual states are increasingly aggressive in passing legislation and implementing regulations designed to control pharmaceutical and biological product pricing, including price or patient reimbursement constraints, discounts, restrictions on certain product access and marketing cost disclosure and transparency measures, and, in some cases, designed to encourage importation from other countries and bulk purchasing. In addition, regional health care authorities and individual hospitals are increasingly using bidding procedures to determine what pharmaceutical products and which suppliers will be included in their prescription drug and other requirements.health care programs. These measures could reduce the ultimate demand for our products, once approved, or put pressure on our product pricing. We expect that additional state and federal healthcare reform measures will be adopted in the future, any of which could limit the amounts that federal and state governments will pay for healthcare products and services, which could result in reduced demand for our product or product candidates or additional pricing pressures.
In the EU, similar political, economic and regulatory developments may affect our ability to profitably commercialize our product candidates, if approved. In markets outside of the United States and the EU, reimbursement and healthcare payment systems vary significantly by country, and many countries have instituted price ceilings on specific products and therapies. In many countries, including those of the EU, the pricing of prescription pharmaceuticals is subject to governmental control and access. In these countries, pricing negotiations with governmental authorities can take considerable time after the receipt of marketing approval for a product. To obtain reimbursement or pricing approval in some countries, we or our collaborators may be required to conduct a clinical trial that compares the cost-effectiveness of our product to other available therapies. If reimbursement of our product is unavailable or limited in scope or amount, or if pricing is set at unsatisfactory levels, our business could be materially harmed.
We are subject to U.S. and foreign export control, import, sanctions, anti-corruption and anti-money laundering laws with respect to our operations and non-compliance with such laws can subject us to criminal and/or civil liability and harm our business.
We are subject to export control and import laws and regulations, including the U.S. Export Administration Regulations, U.S. Customs regulations, various economic and trade sanctions regulations administered by the U.S. Treasury Department’s Office of Foreign Assets Control, the U.S. Foreign Corrupt Practices Act of 1977, as amended, or the FCPA, the U.S. domestic bribery statute contained in 18 U.S.C. § 201, the U.S. Travel Act, the USA PATRIOT Act, and possibly other state and national anti-bribery and anti-money laundering laws in countries in which we conduct activities. Anti-corruption laws are interpreted broadly and prohibit companies and their employees, agents, third-party intermediaries, joint venture partners and collaborators from authorizing, promising, offering, or providing, directly or indirectly, improper payments or benefits to recipients in the public or private sector. We may have direct or indirect interactions with officials and employees of government agencies or government-affiliated hospitals, universities, and other organizations. In addition, we may engage third party intermediaries to promote our clinical research activities abroad and/or to obtain necessary permits, licenses, and other regulatory approvals. We can be held

liable for the corrupt or other illegal activities of these third-party intermediaries, our employees, representatives, contractors, partners, and agents, even if we do not explicitly authorize or have actual knowledge of such activities.
Noncompliance with anti-corruption and anti-money launderingsuch laws could subject us to whistleblower complaints, investigations, sanctions, settlements, prosecution, other enforcement actions, disgorgement of profits, significant fines, damages, other civil and criminal penalties or injunctions, suspension and/or debarment from contracting with certain persons, the loss of export privileges, reputational harm, adverse media coverage, and other collateral consequences. If any subpoenas, investigations, or other enforcement actions are launched, or governmental or other sanctions are imposed, or if we do not prevail in any possible civil or criminal litigation, our business, results of operations and financial condition could be materially harmed. In addition, responding to any action will likely result in a materially significant diversion of management’s attention and resources and significant defense and compliance costs and other professional fees. In certain cases, enforcement authorities may even cause us to appoint an independent compliance monitor which can result in added costs and administrative burdens.
With the passage of the CREATES Act, we are exposed to possible litigation and damages by competitors who may claim that we are not providing sufficient quantities of our approved products on commercially reasonable, market-based terms for testing in support of their ANDAs and 505(b)(2) applications.
In December 2019, former President Trump signed legislation intended to facilitate the development of generic and biosimilar products. The bill, previously known as the CREATES Act, authorizes sponsors of ANDAs and 505(b)(2) applications to file lawsuits against companies holding NDAs that decline to provide sufficient quantities of an approved reference drug on commercially reasonable, market-based terms. Drug products on FDA’s drug shortage list are exempt from these new provisions unless the product has been on the list for more than six continuous months or the FDA determines that the supply of the product will help alleviate or prevent a shortage. For the purposes of the statute, the term “commercially reasonable, market-
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based terms” is defined as (1) the nondiscriminatory price at or below the most recent wholesale acquisition cost for the product, (2) a delivery schedule that meets the statutorily defined timetable, and (3) no additional conditions on the sale.
To bring an action under the statute, an ANDA or 505(b)(2) sponsor must take certain steps to request the reference product, which, in the case of products covered by a Risk Evaluation and Mitigation Strategy with elements to assure safe use, include obtaining authorization from the FDA for the acquisition of the reference product. If the sponsor does bring an action for failure to provide a reference product, there are certain affirmative defenses available to the NDA holder, which must be shown by a preponderance of evidence. If the sponsor prevails in litigation, it is entitled to a court order directing the NDA holder to provide, without delay, sufficient quantities of the applicable product on commercially reasonable, market-based terms, plus reasonable attorney fees and costs.
Additionally, the statutory provisions authorize a federal court to award the product developer an amount “sufficient to deter” the NDA holder from refusing to provide sufficient product quantities on commercially reasonable, market-based terms if the court finds, by a preponderance of the evidence, that the NDA holder did not have a legitimate business justification to delay providing the product or failed to comply with the court’s order.
Although we intend to comply fully with the terms of these new statutory provisions, we are still exposed to potential litigation and damages by competitors who may claim that we are not providing sufficient quantities of our approved products on commercially reasonable, market-based terms for testing in support of ANDAs and 505(b)(2) applications. Such litigation would subject us to additional costs, damages and reputational harm, which could lead to lower revenues. The CREATES Act may enable generic competition with PYRUKYND® and any of our product candidates, if approved, which could impact our ability to maximize product revenue.
If we fail to comply with environmental, health and safety laws and regulations, we could become subject to fines or penalties or incur costs that could have a material adverse effect on the success of our business.
We are subject to numerous environmental, health and safety laws and regulations, including those governing laboratory procedures and the handling, use, storage, treatment and disposal of hazardous materials and wastes. Our operations involve the use of hazardous and flammable materials, including chemicals and biological and radioactive materials. Our operations also produce hazardous waste products. We generally contract with third parties for the disposal of these materials and wastes. We cannot eliminate the risk of contamination or injury from these materials. In the event of contamination or injury resulting from our use of hazardous materials, we could be held liable for any resulting damages, and any liability could exceed our resources. We also could incur significant costs associated with civil or criminal fines and penalties.
Although we maintain workers’ compensation insurance to cover us for costs and expenses we may incur due to injuries to our employees resulting from the use of hazardous materials, this insurance may not provide adequate coverage against potential liabilities. We do not maintain insurance for environmental liability or toxic tort claims that may be asserted against us in connection with our storage or disposal of biological, hazardous or radioactive materials.
In addition, we may incur substantial costs in order to comply with current or future environmental, health and safety laws and regulations. These current or future laws and regulations may impair our research, development or production efforts. Failure to comply with these laws and regulations also may result in substantial fines, penalties or other sanctions.
If we obtain approval to commercialize our product candidates outside of the United States, a variety of risks associated with international operations could materially adversely affect our business.
We expect that we will be subject to additional risks in commercializing our product candidates outside the United States, including:
different regulatory requirements for approval of drugs in foreign countries;
reduced protection for intellectual property rights;
unexpected changes in tariffs, trade barriers and regulatory requirements;
economic weakness, including inflation, or political instability in particular foreign economies and markets;
compliance with tax, employment, immigration and labor laws for employees living or traveling abroad;
foreign currency fluctuations, which could result in increased operating expenses and reduced revenue, and other obligations incident to doing business in another country;
workforce uncertainty in countries where labor unrest is more common than in the United States;
production shortages resulting from any events affecting raw material supply or manufacturing capabilities abroad; and
business interruptions resulting from geopolitical actions, including war and terrorism or natural disasters including earthquakes, typhoons, floods and fires.
Risks Related to Employee Matters and Managing Growth
Our future success depends on our ability to retain our key executives and scientific leadership and to attract, retain and motivate qualified personnel.
We are highly dependent on the principal members of our management and scientific teams, each of whom is employed “at will,” meaning we or they may terminate the employment relationship at any time. We do not maintain “key person” insurance

for any of our executives or other employees. The loss of the services of any of these persons could impede the achievement of our research, development and commercialization objectives. We cannot predict the likelihood, timing or effect of future transitions among our executive leadership.
Recruiting and retaining qualified scientific, clinical, manufacturing, regulatory and sales and marketing personnel will also be critical to our success. We may not be able to attract and retain these personnel on acceptable terms given the competition among numerous pharmaceutical and biotechnology companies and universities and research institutions for similar personnel. We also experience competition for the hiring of scientific and clinical personnel from universities and research institutions. In addition, we rely onOur consultants and advisors, including our scientific and clinical advisors, toco-founders, who assist us in formulating our research and development and commercialization strategy. Our consultants and advisors, including our scientific co-founders,strategy may be employed by employers other than us and may have commitments under consulting or advisory contracts with other entities that may limit their availability to us. Furthermore, the recent COVID-19 pandemic and our flexible workplace policy allowing employees to work from home may make it difficult for us to maintain our corporate culture.
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In the future we may experience growth in the number of our development, regulatory and sales and marketing personnel. To manage any anticipated future growth, we must continue to implement and improve our managerial, operational and financial systems, expand our facilities and continue to recruit and train additional qualified personnel. Any inability to manage growth could delay the execution of our business plans or disrupt our operations.
Our employees may engage in misconduct or other improper activities, including noncompliance with regulatory standards and requirements, which could have a material adverse effect on our business.
We are exposed to the risk of employee fraud or other misconduct. Misconduct by employees could include intentional failures to comply with FDA regulations or regulations in other jurisdictions, provide accurate information to the FDA or other regulatory authorities, comply with manufacturing standards we have established, comply with federal and state healthcare fraud and abuse laws and regulations, report financial information or data accurately, disclose unauthorized activities to us, or comply with securities laws. Employee misconduct could also involve the improper use of information obtained in the course of clinical trials or interactions with the FDA or other regulatory authorities, including for illegal insider trading activities, which could result in regulatory sanctions and serious harm to our reputation. We have adopted a Code of Business Conduct and Ethics, but it is not always possible to identify and deter employee misconduct, and the precautions we take to detect and prevent this activity may not be effective in controlling unknown or unmanaged risks or losses or in protecting us from governmental investigations or other actions or lawsuits stemming from a failure to be in compliance with such laws or regulations. If any such actions are instituted against us, and we are not successful in defending ourselves or asserting our rights, those actions could have a significant impact on our business and results of operations, including the imposition of significant fines or other sanctions.
We expect to expand our development, regulatory and future sales and marketing capabilities, and as a result, we may encounter difficulties in managing our growth, which could disrupt our operations.
We expect to experience significant growth in the number of our employees and the scope of our operations, particularly in the areas of drug development, regulatory affairs and sales and marketing. To manage our anticipated future growth, we must continue to implement and improve our managerial, operational and financial systems, expand our facilities and continue to recruit and train additional qualified personnel. Due to our limited financial resources and the limited experience of our management team in managing a company with such anticipated growth, we may not be able to effectively manage the expected expansion of our operations or recruit and train additional qualified personnel. Moreover, the expected physical expansion of our operations may lead to significant costs and may divert our management and business development resources. Any inability to manage growth could delay the execution of our business plans or disrupt our operations.
We may engage in acquisitions that could disrupt our business, cause dilution to our stockholders or reduce our financial resources.
In the future, we may enter into transactions to acquire other businesses, products or technologies. Because we have not made any acquisitions to date, our ability to do so successfully is unproven. If we do identify suitable candidates, we may not be able to make such acquisitions on favorable terms, or at all. Any acquisitions we make may not strengthen our competitive position, and these transactions may be viewed negatively by customers or investors. We may decide to incur debt in connection with an acquisition or issue our common stock or other equity securities to the stockholders of the acquired company, which would reduce the percentage ownership of our existing stockholders. We could incur losses resulting from undiscovered liabilities of the acquired business that are not covered by the indemnification we may obtain from the seller. In addition, we may not be able to successfully integrate the acquired personnel, technologies and operations into our existing business in an effective, timely and non-disruptive manner. Acquisitions may also divert management attention from day-to-day responsibilities, increase our expenses and reduce our cash available for operations and other uses. We cannot predict the number, timing or size of future acquisitions or the effect that any such transactions might have on our operating results.
Risks Related to Our Common Stock and Other Matters
Provisions in our corporate charter documents and under Delaware law could make an acquisition of us, which may be beneficial to our stockholders, more difficult and may prevent attempts by our stockholders to replace or remove our current management.
Provisions in our corporate charter and our bylaws may discourage, delay or prevent a merger, acquisition or other change in control of us that stockholders may consider favorable, including transactions in which you might otherwise receive a premium for your shares. These provisions could also limit the price that investors might be willing to pay in the future for shares of our

common stock, thereby depressing the market price of our common stock. In addition, because our boardBoard of directorsDirectors is responsible for appointing the members of our management team, these provisions may frustrate or prevent any attempts by our stockholders to replace or remove our current management by making it more difficult for stockholders to replace members of our boardBoard of directors.Directors. Among other things, these provisions:
establish a classified board of directors such that not all members of the board are elected at one time;
allow the authorized number of our directors to be changed only by resolution of our boardBoard of directors;Directors;
limit the manner in which stockholders can remove directors from the board;our Board of Directors;
establish advance notice requirements for stockholder proposals that can be acted on at stockholder meetings and nominations to our boardBoard of directors;Directors;
require that stockholder actions must be effected at a duly called stockholder meeting and prohibit actions by our stockholders by written consent;
limit who may call stockholder meetings;
authorize our boardBoard of directorsDirectors to issue preferred stock without stockholder approval, which could be used to institute a shareholder rights plan, or so-called “poison pill,” that would work to dilute the stock ownership of a potential hostile acquirer, effectively preventing acquisitions that have not been approved by our boardBoard of directors;Directors; and
require the approval of the holders of at least 75% of the votes that all our stockholders would be entitled to cast to amend or repeal certain provisions of our charter or bylaws.
Moreover, because we are incorporated in Delaware, we are governed by the provisions of Section 203 of the Delaware General Corporation Law, which prohibits a person who owns in excess of 15% of our outstanding voting stock from merging or combining with us for a period of three years after the date of the transaction in which the person acquired in excess of 15% of our outstanding voting stock, unless the merger or combination is approved in a prescribed manner.
If securities analysts do not publish research or reports about our business or if they publish negative, or inaccurate, evaluations
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The trading market for our common stock relies in part on the research and reports that industry or financial analysts publish about us or our business. If one or more of the analysts covering our business downgrade their evaluations of our stock, the price of our stock could decline. If one or more of these analysts cease to cover our stock, we could lose visibility in the market for our stock, which in turn could cause our stock price and trading volume to decline.
An active trading market for our common stock may not be sustained.
Although our common stock is listed on the NASDAQ Global Select Market, an active trading market for our shares may not be sustained. If an active market for our common stock does not continue, it may be difficult for our stockholders to sell their shares without depressing the market price for the shares or to sell their shares at all. An inactive trading market for our common stock may also impair our ability to raise capital to continue to fund our operations by selling shares and may impair our ability to acquire other companies or technologies by using our shares as consideration.
The price of our common stock is likely to be volatile, which could result in substantial losses for purchasers of our common stock.
The trading price of our common stock has been, and may continue to be, volatile and could be subject to wide fluctuations in response to various factors, some of which are beyond our control. For example, since January 1, 20142015 the closing price of our common stock on the NASDAQNasdaq Global Select Market has ranged from $21.70$17.06 per share to
138.85 $135.01 per share. The stock market in general and the market for biopharmaceutical companies in particular have experienced extreme volatility that has often been unrelated to the operating performance of particular companies. While the full extent of the economic impact of the recent COVID-19 pandemic or recent increases in inflation rates (particularly as it relates to clinical- or manufacturing-related costs) may be difficult to assess or predict, such impacts have already caused, and are likely to result in further, significant disruption of global financial markets, which may reduce our ability to access capital either at all or on favorable terms. If we are unable to raise additional funds through equity or debt financings when needed or on attractive terms, we may be required to delay, limit, reduce or terminate our product development or future commercialization efforts, or grant rights to develop and market product candidates that we would otherwise prefer to develop and market ourselves.
The market price for our common stock may be influenced by many factors, including:
our success in launching and commercializing PYRUKYND®;
the decision to focus our efforts on our rare disease business following the sale of our oncology business to Servier;
the evolution of our research organization;
announcements by us or our competitors of significant acquisitions, in-licensing arrangements, strategic partnerships, joint ventures, collaborations or capital commitments;
the timing and results of clinical trials of product candidates, or our competitors’ product candidates;
regulatory actions with respect to our product or product candidates or our competitors’ products and product candidates;
announcements by us or our competitors of significant acquisitions, strategic partnerships, joint ventures, collaborations or capital commitments;
the timing and results of clinical trials of product candidates;
commencement or termination of collaborations for our development programs;
failure or discontinuation of any of our development programs;

results of clinical trials of product candidates of our competitors;
regulatory or legal developments in the United States and other countries;
developments or disputes concerning patent applications, issued patents or other proprietary rights;
the recruitment or departure of key personnel;
the level of expenses related to any of our products, product candidates or clinical development programs;
the results of our efforts to develop additional product candidates orand products;
actual or anticipated changes in estimates as to financial results or development timelines;
announcement or expectation of additional financing efforts;
sales of our common stock by us, our insiders or other stockholders;stockholders, including shares issuable upon exercise of outstanding stock options and upon vesting of stock units under our stock incentive plans;
variations in our financial results including fluctuations in levels of royalties on sales of IDHIFA®, or results of companies that are perceived to be similar to us;
changes in estimates, evaluations or recommendations by securities analysts, if any, that cover our stock or the failure by one or more securities analysts to continue to cover our stock;
changes in the structure of healthcare payment systems;
the societal and economic impact of public health epidemics or pandemics, such as the recent COVID-19 pandemic and any recession, depression or sustained market event resulting from such epidemics or pandemics;
market conditions in the pharmaceutical and biotechnology sectors;
general economic, industry and market conditions; and
the other factors described in this “Risk Factors” section.
If any of the forgoing matters were to occur, or if our operating results fall below the expectations of investors or securities analysts, the price of our common stock could decline substantially. In the past, following periods of volatility in the market price of a company's securities, securities class-action litigation often has been instituted against that company. Such litigation, if instituted against us, could cause us to incur substantial costs to defend such claims and divert management'smanagements' attention and resources, which could seriously harm our business, financial condition, results of operations and prospects.
Sales of a substantial number ofWe also cannot guarantee that an active trading market for our shares ofwill be sustained. An inactive trading market for our common stock inmay impair our ability to raise capital to continue to fund our operations by selling shares and may impair our ability to acquire other companies or technologies by using our shares as consideration.
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Our financial condition and operating results also may fluctuate from quarter to quarter and year to year due to a variety of factors, many of which are beyond our control. Accordingly, you should not rely upon the public market could cause our stock price to fall.
Certain stockholders hold a substantial numberresults of sharesany quarterly or annual periods as indications of our common stock. If such stockholders sell, or indicate an intention to sell, substantial amounts of our common stock in the public market, the trading price of our common stock could decline.
In addition, shares of common stock that are either subject to outstanding options or reserved for future issuance under our stock incentive plans will become eligible for sale in the public market to the extent permitted by the provisions of various vesting schedules and Rule 144 and Rule 701 under the Securities Act of 1933, as amended, or the Securities Act, and, in any event, we have filed a registration statement permitting shares of common stock issued on exercise of options to be freely sold in the public market. If these additional shares of common stock are sold, or if it is perceived that they will be sold, in the public market, the trading price of our common stock could decline.
Certain holders of our common stock are entitled to rights with respect to the registration of their shares under the Securities Act. Registration of these shares under the Securities Act would result in the shares becoming freely tradable without restriction under the Securities Act, except for shares held by affiliates. Any sales of securities by these stockholders who have exercised registration rights could have a material adverse effect on the trading price of our common stock.operating performance.
Our executive officers, directors and principal stockholders maintain the ability to significantly influence all matters submitted to stockholders for approval.
As of December 31, 2017,2023, our executive officers, directors and a small group ofprincipal stockholders, in the aggregate, beneficially owned shares representing a significant percentage of our capital stock. As a result, if these stockholders were to choose to act together, they would be able to significantly influence all matters submitted to our stockholders for approval, as well as our management and affairs. For example, these persons if they choose to act together, could significantly influence the election of directors and approval of any merger, consolidation or sale of all or substantially all of our assets. This concentration of voting power could delay or prevent an acquisition of our company on terms that other stockholders may desire.
Future sales and issuances of our common stock or rights to purchase common stock could result in additional dilution of the percentage ownership of our stockholders and could cause our stock price to fall.
We expect that significant additional capital will be needed in the future to continue our planned operations. To raise capital, we may sell common stock, convertible securities or other equity securities in one or more transactions at prices and in a manner

we determine from time to time. If we sell common stock, convertible securities or other equity securities in more than one transaction, investors may be materially diluted by subsequent sales. Such sales may also result in material dilution to our existing stockholders, and new investors could gain rights, preferences and privileges senior to those of holders of our common stock.
Our ability to use our net operating loss carryforwards and certain other tax attributes may be limited.
Under Section 382 of the Internal Revenue Code and corresponding provisions of 1986, as amended, or the IRC,state law, if a company undergoes an “ownership change,” generally defined as a greater than 50% change (by value) in its equity ownership by certain stockholders over a three-year period, the corporation’scompany’s ability to use its pre-change net operating loss carryforwards and other pre-change tax attributes (such as research tax credits) to offset its post-change taxable income or taxes may be limited. Our prior equity offerings and other changes in our stock ownership, some of which are outside of our control, may have resulted or could in the future result in an ownership change. We completed a review of our changes in ownership through December 31, 2017,2023, and determined that we haddid not have a qualified ownership change since our last review as of December 31, 2011. We do not expect that this or any previous changes of ownership will result in our net operating loss carryforwards or certain other tax attributes expiring unutilized.2022. Future ownership changes under Section 382 may limit the amount of net operating loss and tax credit carryforwards that we could potentially utilize to reduce future tax liabilities.
The recently passed comprehensive tax reform billThere is also a risk that due to regulatory changes, such as suspensions on the use of net operating losses, or other unforeseen reasons, our existing net operating losses could adversely affect our business and financial condition.
On December 22, 2017, President Trump signed into law new legislation that significantly revised the Internal Revenue Code of 1986, as amended. The newly enacted federalexpire or otherwise become unavailable to offset future income tax law, among other things, contains significantliabilities. The Tax Act, as amended by the Coronavirus Aid, Relief, and Economic Security Act includes changes to corporate taxation, including reduction ofU.S. federal tax rates and the corporate tax rate from a top marginal rate of 35%rules governing net operating loss carryforwards that may significantly impact our ability to a flat rate of 21%, limitation of the tax deduction for interest expense to 30% of adjusted earnings (except for certain small businesses), limitation of the deduction forutilize our net operating losses to 80% of current yearoffset taxable income and elimination ofin the future. In addition, state net operating loss carrybacks,losses generated in one time taxation of offshore earnings at reduced rates regardless of whether they are repatriated, elimination of U.S. tax on foreign earnings (subjectstate cannot be used to certain important exceptions), immediate deductions for certain new investments instead of deductions for depreciation expense over time, and modifying or repealing many business deductions and credits. Notwithstanding the reductionoffset income generated in the corporate income tax rate, the overall impact of the new federal tax law is uncertain and our business and financial condition couldanother state. For these reasons we may be adversely affected. In addition, it is uncertain how various states will respondunable to the newly enacted federal tax law. The impact of this tax reform on holdersuse a material portion of our common stock is also uncertainnet operating losses and could be adverse. We urge our stockholders to consult with their legal andother tax advisors with respect to this legislation and the potential tax consequences of investing in or holding our common stock.attributes.
Our effective tax rate may fluctuate, and we may incur obligations in tax jurisdictions in excess of accrued amounts.
We are subject to taxation in numerous U.S. states and territories. As a result, our effective tax rate is derived from a combination of applicable tax rates in the various places that we operate. In preparing our financial statements, we estimate the amount of tax that will become payable in each of such places. Nevertheless, our effective tax rate may be different than experienced in the pastfrom previous periods or our current expectations due to numerous factors, including passageas a result of the newly enacted federal income tax law, changes in the mix of our profitability from state to state, the results of examinations and audits of our tax filings, our inability to secure or sustain acceptable agreements with tax authorities, changes in accounting for income taxes and changes in tax laws. Any of these factors could cause us to experience an effective tax rate significantly different from previous periods or our current expectations and may result in tax obligations in excess of amounts accrued in our financial statements.
We incur costs as a result of operating as a public company, and our management is required to devote substantial time to new compliance initiatives and corporate governance practices.
We have incurred and will continue to incur significant legal, accounting and other expenses as a public company. The Sarbanes-Oxley Act of 2002, the Dodd-Frank Wall Street Reform and Consumer Protection Act, the listing requirements of The NASDAQNasdaq Global Select Market and other applicable securities rules and regulations impose various requirements on public companies, including establishment and maintenance of effective disclosure and financial controls and corporate governance practices. Stockholder activism, the current political environment and the current high level of government intervention and regulatory reform may lead to substantial new regulations. Our management and other personnel devote, and will need to continue to devote, a substantial amount of time to these compliance initiatives. Moreover, these rules and regulations increase our legal and financial compliance costs and make some activities more time-consuming and costly.
Because we do not anticipate paying any cash dividends on our capital stock in the foreseeable future, capital appreciation, if any, will be the sole source of gain for our stockholders.
We have never declared or paid cash dividends on our capital stock. We currently intend to retain all of our future earnings, if any, to finance the growth and development of our business. In addition, the terms of any future debt agreements may preclude us from paying dividends. As a result, capital appreciation, if any, of our common stock will be the sole source of gain for our stockholders for the foreseeable future.

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Item 1B. Unresolved Staff Comments
None.
Item 1C. Cybersecurity
We have certain processes for assessing, identifying and managing cybersecurity risks, which are built into our overall information technology function and are designed to help protect our information assets and operations from internal and external cyber threats, and protect employee, collaborator and patient information from unauthorized access or attack, as well as secure our networks and systems. Such processes include physical, procedural and technical safeguards, response plans, regular tests on our systems, incident simulations and routine review of our policies and procedures to identify risks and refine our practices. We engage certain external parties, including consultants, computer security firms and risk management advisors, peer companies, industry groups and governance experts, to enhance our cybersecurity oversight including by gaining valuable insights into the ever-evolving cybersecurity landscape. We consider the internal risk oversight programs of third-party service providers before engaging them in order to help protect us from any related vulnerabilities.
We do not believe that there are currently any known risks from cybersecurity threats that are reasonably likely to materially affect us or our business strategy, results of operations or financial condition.
The Audit Committee of our Board of Directors provides direct oversight over cybersecurity risk, and provides updates to the Board of Directors regarding such oversight. The Audit Committee receives periodic updates from management regarding cybersecurity matters, and is notified between such updates regarding significant new cybersecurity threats or incidents.
Our Vice President, Information Technology and Facilities, or the VP of IT, leads the operational oversight of company-wide cybersecurity strategy, policy, standards and processes and works across relevant departments to assess and help prepare us and our employees to address cybersecurity risks. Our VP of IT has worked in the information technology field for over 20 years at both biotechnology companies and management consulting firms, and holds a Bachelor of Science in Management and a Masters of Business Administration. We also maintain a team of experienced senior level engineers who design, implement and operate our information technology ecosystem, helping to implement cybersecurity best practices throughout our information technology infrastructure and governance processes. We periodically assess our processes against cybersecurity frameworks, such as the National Institute of Standards and Technology, or NIST, Cybersecurity Framework, Center for Internet Security, or CIS, Controls, and International Organization for Standardization, or ISO, 27001.
In an effort to deter and detect cyber threats, we annually provide all employees, including part-time and temporary employees, with a data protection, cybersecurity and incident response and prevention training and compliance program, which covers timely and relevant topics, including social engineering, phishing, password protection, confidential data protection, asset use and mobile security, and educates employees on the importance of reporting all incidents immediately. We also use technology-based tools that are designed to mitigate cybersecurity risks and to bolster our employee-based cybersecurity programs.
Item 2. Properties
We currently lease approximately 146,030146,000 square feet at 88 Sidney Street, Cambridge, Massachusetts. This lease, as amended, expires on January 31, 2025. We also lease approximately 27,10043,000 square feet at 64 Sidney Street, and 13,000 square feet at 38 Sidney Street, Cambridge, Massachusetts. This lease also expiresAll leases, as amended, expire on January 31, 2025.February 29, 2028. At the end of the initial lease period, we have the option to extend the leases at one or bothall facilities for two consecutive five yearfive-year periods at the fair market rent at the time of the extension.
In August 2021, we entered into a long-term sublease agreement for the 13,000 square feet at 38 Sidney Street, Cambridge, Massachusetts, with the term of the lease running through December 2024. In April 2022, we entered into a long-term sublease agreement for 27,000 square feet of office space at 64 Sidney Street, Cambridge, Massachusetts, with the term of the lease running through April 2025. In May 2023, we entered into a long-term sublease agreement for 7,407 square feet of office space on the first floor of 64 Sidney Street, Cambridge, Massachusetts, with the term of the lease running through April 2025. We believe our existing facilities are adequate for our current needs and that additional space will be available in the future on commercially reasonable terms as needed.needs.
Item 3. Legal Proceedings
As of December 31, 2017,2023, we were not a party to any material legal or arbitration proceedings. No governmental proceedings are pending or, to our knowledge, contemplated against us. We are not a party to any material proceedings in which any director, member of senior management or affiliate of ours is either a party adverse to us or our subsidiaries or has a material interest adverse to us or our subsidiaries.
Item 4. Mine Safety Disclosures
Not applicable.

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PART II
Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities
Market Information
Our common stock has been publicly traded on the NASDAQNasdaq Global Select Market under the symbol “AGIO” since July 24, 2013. Prior to that time, there was no public market for our common stock. The following table sets forth the high and low sales prices of our common stock as reported on the NASDAQ Global Select Market for each quarter in the years ended December 31, 2017 and 2016.
2017High Low
First Quarter$58.65
 $39.24
Second Quarter$59.58
 $45.11
Third Quarter$67.72
 $50.91
Fourth Quarter$72.73
 $51.62
2016High Low
First Quarter$66.87
 $33.50
Second Quarter$66.74
 $39.36
Third Quarter$54.99
 $35.84
Fourth Quarter$67.74
 $40.59
Holders
As of February 9, 2018,2024, there were approximately 16nine holders of record of our common stock. This number does not include beneficial owners whose shares are held by nominees in street name.
Dividends
We have not declared or paid any cash dividends on our capital stock since our inception. We intend to retain future earnings, if any, to finance the operation and expansion of our business and do not anticipate paying any cash dividends to holders of common stock in the foreseeable future.
Securities Authorized for Issuance under Equity Compensation Plans
Information about our equity compensation plans is incorporated herein by reference to Item 12,, Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters, of this Annual Report on Form 10-K.
Performance Graph
The following performance graph and related information shall not be deemed to be “soliciting material” or to be “filed” with the Securities and Exchange Commission, or SEC, for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or the Exchange Act, or otherwise subject to the liabilities under that Section, nor shall such information be incorporated by reference into any future filing under the Exchange Act or the Securities Act of 1933, as amended, or the Securities Act, except to the extent that we specifically incorporate it by reference into such filing.
The following graph compares the performance of our common stock to the NASDAQ Composite Index and the NASDAQ Biotechnology Index from July 24, 2013 (the first date that shares of our common stock were publicly traded)December 31, 2018 through December 31, 2017.2023. The comparison assumes $100 was invested after the market closed on July 24, 2013December 31, 2018 in our common stock and in each of the foregoing indices, and it assumes reinvestment of dividends, if any. The stock price performance included in this graph is not necessarily indicative of future stock price performance.

Stock Performance Graph 2023.jpg

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Recent Sales of Unregistered Securities
None.
Purchases of Equity Securities by the Issuer or Affiliated Purchasers
Neither we nor any affiliated purchaser or anyone acting on behalf of us or an affiliated purchaser made any purchases of shares of our common stock during the fourth quarter of 2017.None.


Item 6. Selected Consolidated Financial DataReserved.
You should read the following selected historical consolidated financial data along with Item 7, Management’s Discussion and Analysis of Financial Condition and Results of Operations, and the consolidated financial statements and related notes thereto contained in this Annual Report on Form 10-K. Our historical results for any prior period are not necessarily indicative of results to be expected in any future period.
The financial information included in the tables below are derived from audited financial statements.
Our consolidated statements of operations are summarized as follows (in thousands, except per share amounts):
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 Years Ended December 31,
 2017 2016 2015 2014 2013
Consolidated Statements of Operations:         
Collaboration revenue – related party$41,074
 $69,892
 $59,119
 $65,358
 $25,548
Royalty revenue – related party1,937
 
 
 
 
Total revenue43,011
 69,892
 59,119
 65,358
 25,548
Operating expenses:         
Research and development (net of $7,811, $19,714 and $25,173 of cost reimbursement from related party for the years ended December 31, 2017, 2016 and 2015, respectively)292,681
 220,163
 141,827
 100,371
 54,502
General and administrative71,124
 50,714
 35,992
 19,120
 9,929
Total operating expenses363,805
 270,877
 177,819
 119,491
 64,431
Loss from operations(320,794) (200,985) (118,700) (54,133) (38,883)
Interest income6,124
 2,514
 968
 203
 55
Loss before (benefit) provision for income taxes(314,670) (198,471) (117,732) (53,930) (38,828)
(Benefit) provision for income taxes
 
 
 (426) 579
Net loss(314,670) (198,471) (117,732) (53,504) (39,407)
Cumulative preferred stock dividends
 
 
 
 (4,162)
Net loss applicable to common stockholders$(314,670) $(198,471) $(117,732) $(53,504) $(43,569)
Net loss per share – basic and diluted$(6.75) $(5.07) $(3.15) $(1.59) $(2.83)
Weighted-average number of common shares used in computing net loss per share – basic and diluted46,587,631
 39,126,400
 37,429,262
 33,667,024
 15,415,373
Our consolidated balance sheets are summarized as follows (in thousands):

 December 31,
 2017 2016 2015 2014 2013
Consolidated Balance Sheet:         
Cash, cash equivalents and marketable securities$567,750
 $573,564
 $375,907
 $467,447
 $193,894
Total assets614,397
 619,094
 420,065
 491,904
 201,205
Total liabilities238,894
 260,503
 74,947
 67,538
 69,723
Common stock49
 42
 38
 37
 31
Additional paid-in capital1,174,904
 842,013
 630,078
 591,334
 244,881
Accumulated deficit(798,061) (483,151) (284,680) (166,948) (113,444)
Total stockholders’ equity375,503
 358,591
 345,118
 424,366
 131,482

Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations
You should read the following discussion and analysis of our financial condition and results of operations together with our consolidated financial statements and the related notes and other financial information included elsewhere in this Annual Report on Form 10-K. Some of the information contained in this discussion and analysis or set forth elsewhere in this Annual Report on Form 10-K, including information with respect to our plans and strategy for our business, includes forward-looking statements that involve risks and uncertainties. You should review "Item"Item 1A, Risk Factors" of this Annual Report on Form 10-K for a discussion of important factors that could cause actual results to differ materially from the results described in or implied by the forward-looking statements contained in the following discussion and analysis.
Overview
We are a biopharmaceutical company committed to the fundamental transformation oftransforming patients’ lives through scientific leadership in the field of cellular metabolism, with the goal of making transformative, first- or best-in-class medicines. Our therapeutic areascreating differentiated medicines for rare diseases, with a focus on classical hematology. With a history of focus are cancer and rare genetic diseases, or RGDs, which are diseases that are directly caused by changes in genes or chromosomes, often passed from one generation to the next. Most RGDs are often associated with severe or life-threatening features. The incidence of a single RGD can vary widely but is generally very infrequent, usually equal to or less than one per 100,000 births. In both areas of cancer and RGDs, we are seeking to unlock the biology offocused study on cellular metabolism, aswe have a platformdeep and mature understanding of this biology, which is involved in the healthy functioning of nearly every system in the body. Building on this expertise, these learnings can be rapidly applied to create transformative therapies.our clinical trials with the goal of developing medicines that can have a significant impact for patients. We accelerate the impact of our portfolio by cultivating connections with patient communities, healthcare professionals, partners and colleagues to discover, develop and deliver potential therapies for rare diseases.
Our first commercial cancerThe lead product candidate in our portfolio, PYRUKYND® (mitapivat), is IDHIFA®.an activator of both wild-type and mutant pyruvate kinase, or PK, enzymes for the potential treatment of hemolytic anemias. In August 2017,February 2022, the U.S. Food and Drug Administration, or FDA, approved PYRUKYND® for the treatment of hemolytic anemia in adults with PK deficiency in the United States. In November 2022, we received marketing authorization from the European Commission for PYRUKYND® for the treatment of PK deficiency in adult patients in the European Union, or EU. In December 2022, we received marketing authorization in Great Britain for PYRUKYND® for the treatment of PK deficiency in adult patients under the European Commission Decision Reliance Procedure. In addition, we are currently evaluating PYRUKYND® in clinical trials for the treatment of thalassemia, sickle cell disease, or SCD, and in pediatric patients with PK deficiency. We are also developing (i) AG-946, a novel PK activator, for the potential treatment of lower-risk myelodysplastic syndrome, or LR MDS, and hemolytic anemias, and (ii) AG-181, our phenylalanine hydroxylase, or PAH, stabilizer for the potential treatment of phenylketonuria, or PKU.

In addition to the aforementioned development programs, in July 2023 we entered into a license agreement with Alnylam Pharmaceuticals, Inc., or Alnylam for the development and commercialization of products containing or comprised of an siRNA preclinical development candidate discovered by Alnylam and targeting the transmembrane serine protease 6, or TMPRSS6, gene and we intend to pursue development of a licensed product for the potential disease-modifying treatment of patients with polycythemia vera, or PV, a rare blood disorder.
Alnylam License Agreement
In accordance with the license agreement with Alnylam, in the year ended December 31, 2023, we made an up-front payment to Alnylam and recognized in-process research and development of $17.5 million which was recorded in research and development expense within our Consolidated Statements of Operations and classified as investing activities within our Consolidated Statements of Cash Flows. We will also pay Alnylam for certain expenses associated with the development of the TMPRSS6 gene and these will be recorded in our Consolidated Statements of Operations as incurred. Additionally, we are responsible to pay up to $130.0 million in potential development and regulatory milestones, in addition to sales milestones as well as tiered royalties on annual net sales, if any, of licensed products, which may be subject to specified reductions and offsets. Because the acquired assets under the license agreement with Alnylam do not meet the definition of a business in accordance with ASC 805, Business Combinations, we accounted for the agreement as an asset acquisition.
Sale of Oncology Business to Servier Pharmaceuticals, LLC (Servier) and Sale of Contingent Payments
On March 31, 2021, we completed the sale of our oncology business to Servier Pharmaceuticals, LLC, or Servier, which represented a discontinued operation. The transaction included the sale of our oncology business, including TIBSOVO®, our clinical-stage product candidates vorasidenib, AG-270 and AG-636, and our oncology research programs for a payment of approximately $1.8 billion in cash at the closing, subject to certain adjustments, and a payment of $200.0 million in cash, if, prior to January 1, 2027, vorasidenib is granted new drug application approval from the FDA with an approved label that permits vorasidenib’s use as a single agent for the adjuvant treatment of patients with Grade 2 glioma that have an isocitrate dehydrogenase 1 or 2 mutation (and, to the extent required by such approval, the vorasidenib companion diagnostic test is granted an FDA premarket approval), as well as a royalty of 5% of U.S. net sales of TIBSOVO® from the close of the transaction through loss of exclusivity, and a royalty of 15% of U.S. net sales of vorasidenib from the first commercial sale of vorasidenib through loss of exclusivity, with these royalties referred to as contingent payments and recognized as income when
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realizable. Servier also acquired our co-commercialization rights for Bristol Myers Squibb’s IDHIFA® and the right to receive a $25.0 million potential milestone payment under our prior collaboration partneragreement with Celgene Corporation, or Celgene, approvaland Servier is responsible for conducting certain clinical development activities within the IDHIFA® development program.
In October 2022, we sold our rights to future contingent payments associated with the royalty of IDHIFA®5% of U.S. net sales of TIBSOVO® from the close of the transaction through the loss of exclusivity to entities affiliated with Sagard Healthcare Partners, or Sagard, and recognized income of $127.9 million within the gain on sale of contingent payments line item in our consolidated statements of operations for the treatment of adult patients with relapsed or refractory acute myeloid leukemia, or R/R AML,year ended December 31, 2022. We retain our rights to the potential milestone payment and an isocitrate dehydrogenase 2, or IDH2, mutation as detectedroyalties from Servier if a new drug application for vorasidenib is approved by an FDA-approved test. IDHIFA®, an oral targeted inhibitor of the mutated IDH2 enzyme, is the first and only FDA-approved therapy for patients with R/R AML and an IDH2 mutation.FDA.
Our most advanced clinical cancer product candidates are ivosidenib, which targets mutated isocitrate dehydrogenase 1, or IDH1, and AG-881, which is a brain-penetrant pan-IDH mutant inhibitor. These mutations are found in a wide range of hematological malignancies and solid tumors. In December 2017, we submittedNovember 2023, Servier announced that it was planning to submit a new drug application, or NDA, to the FDA for ivosidenibvorasidenib for the treatment of patients with R/R AMLIDH-mutant diffuse glioma to the FDA by the end of 2023 and an IDH1 mutation. We plan to submit an Marketing Authorization Application, or MAA, to the European Medicines Agency, or EMA, for ivosidenib for IDH1 mutant-positive R/R AML in early 2024.
The oncology business met the fourth quarter of 2018.
Our next most advanced cancer product candidate is AG-270, an inhibitor of methionine adenosyltransferase 2a, or MAT2A. We submitted an investigational new drug application, or IND, for AG-270criteria within Accounting Standards Codification 205-20 to be reported as discontinued operations because the transaction was a strategic shift in November 2017,business that had a major effect on our operations and in December 2017financial results. Therefore, we have reported the FDA concluded that we may proceed with our planned phase 1 dose-escalation trial of AG-270 in multiple tumor types carrying a methylthioadenosine phosphorylase, or MTAP, deletion.
Our most advanced preclinical cancer product candidate is an inhibitorhistorical results of the metabolic enzyme dihydroorotate dehydrogenase, or DHODH. We planoncology business including the results of operations and cash flows as discontinued operations, and related assets and liabilities were retrospectively reclassified as assets and liabilities of discontinued operations for all periods presented herein. Refer to submit an INDNote 15, Discontinued Operations of our consolidated financial statements included in this Annual Report on Form 10-K for additional information. A more complete description of our DHODH inhibitorbusiness prior to the consummation of the transaction is included in Item 1. “Business”, in Part I of our Annual Report on Form 10-K for the treatment of hematologic malignancies in the fourth quarter of 2018.
The lead product candidate in our RGD program, AG-348, targets pyruvate kinase-R for the treatment of pyruvate kinase, or PK, deficiency. PK deficiency is a rare genetic disorderyear ended December 31, 2020 that often results in severe hemolytic anemia, jaundice and lifelong conditions associated with chronic anemia and secondary complications due to inherited mutations in the pyruvate kinase enzyme within red blood cells, or RBCs. We intend to initiate two global, pivotal trials of AG-348 in PK deficiency in the first half of 2018: ACTIVATE-T, a single arm trial of approximately 20 regularly transfused patients, is expected to initiate in the first quarter of 2018, and ACTIVATE, a 1:1 randomized, placebo-controlled trial of approximately 80 patients who do not receive regular transfusions, is expected to initiate in the second quarter of 2018. We also expect to initiate a phase 2 proof of concept trial of AG-348 in thalassemia in the fourth quarter of 2018.
In addition to the aforementioned development programs, we are seeking to advance a number of early-stage discovery programs in the areas of cancer metabolism, RGDs and metabolic immuno-oncology, or MIO, a developing field which aims to modulate the activity of relevant immune cells by targeting critical metabolic nodes, thereby, enhancing the immune mediated anti-tumor response.
Celgene Collaboration Agreements
2016 Agreement
In May 2016, we entered into the 2016 Agreement with Celgene, which is focused on MIO, or the 2016 Agreement. In addition to new programs identified under the 2016 Agreement, both parties also agreed that all future development and commercialization of two remaining cancer metabolism programs discovered under the 2010 Agreement, including AG-270, our MAT2A inhibitor, will be governed by the 2016 Agreement.

During the research term of the 2016 Agreement, we plan to conduct research programs focused on discovering compounds that are active against metabolic targets in the immuno-oncology, or IO, field. The initial four-year research term will expire on May 17, 2020, and may be extended for up to two, or in specified cases, up to four additional one-year terms.
For each program under the 2016 Agreement, we may nominate compounds that meet specified criteria as development candidates and, in limited circumstances, Celgene may also nominate compounds as development candidates for each such program. Celgene may designate the applicable program for further development following any such nomination, after which we may conduct, at our expense, additional preclinical and clinical development for such program through the completion of an initial phase 1 dose escalation study.
At the end of the research term, Celgene may designate for continued development up to three research programs for which development candidates have yet to be nominated, which are referred to as continuation programs. We may conduct further research and preclinical and clinical development activities on any continuation program, at our expense, through the completion of an initial phase 1 dose escalation study.
We granted Celgene the right to obtain exclusive options for development and commercialization rights for each program that Celgene has designated for further development and for each continuation program. Celgene may exercise each such option beginning on the designation of a development candidate for such program (or on the designation of such program as a continuation program) and ending on the earlier of: (i) the end of a specified period after we have furnished Celgene with specified information about the initial phase 1 dose escalation study for such program, or (ii) January 1, 2030. Research programs that have applications in the inflammation or autoimmune, or I&I, field that may result from the 2016 Agreement will also be subject to the exclusive options described above.
We will retain rights to any program that Celgene does not designate for further development or as to which it does not exercise its option.
Under the terms of the 2016 Agreement, following Celgene’s exercise of its option with respect to a program, the parties will enter into either a co-development and co-commercialization agreement if such program is in the IO field, or a license agreement if such program is in the I&I field. Under each co-development and co-commercialization agreement, the two parties will co-develop and co-commercialize licensed products worldwide. Either we or Celgene will lead development and commercialization of licensed products for the United States, and Celgene will lead development and commercialization of licensed products outside of the United States. Depending on the country, the parties will each have the right to provide a portion of field-based marketing activities. Under each license agreement, Celgene will have the sole right to develop and commercialize licensed products worldwide.
Ivosidenib Letter Agreement
On May 17, 2016, we entered into a letter agreement with Celgene regarding ivosidenib, or the Ivosidenib Letter Agreement. Under the Ivosidenib Letter Agreement, the parties agreed to terminate the 2010 Agreement, effective as of August 15, 2016, as to the program directed to the IDH1 target, for which ivosidenib is the lead development candidate. Under the 2010 Agreement, Celgene had held development and commercialization rights to the IDH1 program outside of the United States, and we held such rights inside the United States. As a result of the Ivosidenib Letter Agreement, we obtained global rights to ivosidenib and the IDH1 program. Neither party will have any further financial obligation, including royalties or milestone payments, to the other concerning ivosidenib or the IDH1 program. Under the terms of the Ivosidenib Letter Agreement, the parties also agreed to conduct specified transitional activities in connectionwas previously filed with the termination. In addition, pursuant to the Ivosidenib Letter Agreement, the parties are released from their exclusivity obligations under the 2010 Agreement with respect to the IDH1 program. The Ivosidenib Letter Agreement does not affect the AG-881 Agreements, which are directed to both the IDH1 targetSecurities and the IDH2 target.
AG-881 Agreements
On April 27, 2015, we entered into a joint worldwide development and profit share collaboration and license agreement with Celgene, and our wholly owned subsidiary, Agios International Sarl, entered into a collaboration and license agreement with Celgene's wholly owned subsidiary, Celgene International II Sarl,Exchange Commission, or collectively, the AG-881 Agreements. The AG-881 Agreements establish a joint worldwide collaboration focusedSEC, on the development and commercialization of AG-881 products. Under the terms of the AG-881 Agreements, we received an initial upfront payment of $10.0 million in May 2015 and are eligible to receive milestone-based payments. The parties will split all worldwide development costs equally, subject to specified exceptions, as well as any profits from any net sales of, or commercialization losses related to, licensed AG-881 products. Either party may, at its own expense and with the other party's permission, undertake additional development activities outside of the scope of the development plan agreed upon with the other party.

2010 Agreement
In April 2010, we entered into a collaboration agreement with Celgene focused on cancer metabolism, or the 2010 Agreement. The 2010 Agreement was amended in October 2011 and July 2014. The goal of the collaboration was to discover, develop and commercialize disease-altering therapies in oncology based on our cancer metabolism research platform. We initially led discovery, preclinical and early clinical development for all cancer metabolism programs under the collaboration. The discovery phase of the 2010 Agreement expired in April 2016.
Upon agreement to terminate the 2010 Agreement, effective as of August 15, 2016, as to the program directed to the IDH1 target, for which ivosidenib is the lead development candidate, the sole program remaining under the 2010 Agreement is IDHIFA®, a co-commercialized licensed program for which Celgene leads and funds global development and commercialization activities. We have exercised our right to participate in a portion of commercialization activities in the United States for IDHIFA® in accordance with the applicable commercialization plan.February 25, 2021.
Financial Operations Overview
General
Since inception, our operations have primarily focused on organizing and staffing our company, business planning, raising capital, assembling our core capabilities in cellular metabolism and classical hematology, identifying potential product candidates, undertaking preclinical studies, and conducting clinical trials. To date,trials, establishing a commercial infrastructure, preparing for and executing on the commercial launch of PYRUKYND® and, prior to the sale of our oncology business to Servier on March 31, 2021, marketing TIBSOVO® and IDHIFA®. Through March 31, 2021, we have financed our operations primarily through proceeds from the sale of our royalty rights, commercial sales of TIBSOVO®, funding received from the 2010 Agreement, the AG-881 Agreements, the 2016 Agreement,our collaboration agreements, private placements of our preferred stock, our initial public offering of our common stock and concurrent private placement of common stock to an affiliate of Celgene, and our follow-on public offerings. Following the sale of our oncology business to Servier on March 31, 2021, we have financed and expect to continue to finance our operations primarily through cash on hand, royalty payments from Servier with respect to U.S. net sales of TIBSOVO® prior to the sale of these contingent payments to Sagard, proceeds from the sale of contingent payments to Sagard, a potential milestone payment and royalties from Servier if a new drug application for vorasidenib is approved by the FDA with a label that permits vorasidenib's use as a single agent for the adjuvant treatment of patients with Grade 2 glioma that have an isocitrate dehydrogenase 1 or 2 mutation, the actual and potential future sales of PYRUKYND® and, potentially, collaborations, strategic alliances, licensing arrangements and other nondilutive strategic transactions. In addition, we may pursue opportunistic debt offerings, and equity or equity-linked offerings.
Additionally, since inception, we have incurred significant operating losses. Our net losses were $314.7 million, $198.5 million and $117.7 millionloss for the yearsyear ended December 31, 2017, 20162023 was $352.1 million, our net loss for the year ended December 31, 2022 was $231.8 million and 2015, respectively.our net income for the year ended December 31, 2021 was $1.6 billion. As of December 31, 2017,2023, we had an accumulated deficit of $798.1$822.6 million. The net income we generated in the year ended December 31, 2021 was due to the sale of our oncology business to Servier. We expect to continue to incur significant expenses and operatingnet losses over the next several years.until such time we are able to report profitable results. Our net losses may fluctuate significantly from year to year. We anticipateexpect that ourwe will continue to incur significant expenses will increase significantly as we continue to advance and expand clinical development and commercialization activities for our lead programs: IDHIFA®, ivosidenib, AG-881, AG-348,PYRUKYND®; advance and AG-270;expand clinical development of AG-946; continue to discover and validate novel targets and drug product candidates;prioritize advancement of AG-181, our PAH stabilizer; initiate preclinical development of a licensed siRNA development candidate pursuant to our license agreement with Alnylam; expand and protect our intellectual property portfolio;portfolio, including by in-licensing or acquiring assets for pipeline growth; and hire additional commercial development and scientificdevelopment personnel.
Revenue
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Through December 31, 2017,Revenues
Our wholly owned product, PYRUKYND®, received approval from the FDA on February 17, 2022, for the treatment of hemolytic anemia in adults with PK deficiency in the United States. Upon FDA approval of PYRUKYND® in the United States, we have not generated anybegan generating product revenue from product sales. Allsales of PYRUKYND®. We sell PYRUKYND® to a limited number of specialty distributors and specialty pharmacy providers, or collectively, the Customers. These Customers subsequently resell PYRUKYND® to pharmacies or dispense PYRUKYND® directly to patients. In addition to distribution agreements with Customers, we enter into arrangements with healthcare providers and payors that provide for government-mandated and/or privately-negotiated rebates, chargebacks and discounts with respect to the purchase of PYRUKYND®. For further discussion of our revenue recognition policy, see Note 2, Summary of Significant Accounting Polices and Note 8, Product Revenue, to date has been derived from our collaborations or royalty revenuethe consolidated financial statements in this Annual Report on sales of IDHIFA®. Form 10-K.

In the future, we will seekexpect to continue to generate revenue from a combination of product sales, and we may potentially generate revenue from royalties on product sales, cost reimbursements, milestone payments, and upfront payments to the extent we enter intounder existing arrangements or future collaborations or licensing agreements.

Cost of Sales
Cost of sales consists primarily of manufacturing costs for sales of PYRUKYND®. Based on our policy to expense costs associated with the manufacturing of our products prior to regulatory approval, certain of the manufacturing costs associated with product shipments of PYRUKYND® recorded during the years ended December 31, 2023 and December 31, 2022 were expensed prior to February 17, 2022, and, therefore, are not included in costs of sales during the years ended December 31, 2023 and December 31, 2022.
Research and development expensesDevelopment Expenses
Research and development activities are central to our business model. Product candidates in later stages of clinical development generally have higher development costs than those in earlier stages of clinical development, primarily due to the increased size and duration of later-stage clinical trials. We expect research and development costs related to our portfolio to increase significantly for the foreseeable future as our product candidate development programs progress. However, the successful development of our product candidates is highly uncertain. As such, at this time, we cannot reasonably estimate or know the nature, timing and estimated costs of the efforts that will be necessary to complete the remainder of the development and to commercialize these product candidates. We are also unable to predict when, if ever, materialthe amount of net cash inflows will commence from IDHIFA®, ivosidenib, AG-881, AG-348, AG-270,PYRUKYND® or any of our other product candidates. This is due to the numerous risks and uncertainties associated with developing medicines, including the uncertainty of:
establishing an appropriate safety profile with an investigational new drug application, or IND, and/or new drug application, or NDA, enabling toxicology and clinical studies;trials;
the successful enrollment in, and completion of, clinical trials;
the receipt of marketing approvals from applicable regulatory authorities;
establishing compliant commercial manufacturing capabilities or making arrangements with third-party manufacturers;
obtaining and maintaining patent and trade secret protection and regulatory exclusivity for our product candidates;
launching commercial sales of the products, if and when approved, whether alone or in collaboration with others; and

maintaining an acceptable safety profile of the products following approval.
A change in the outcome of any of these variables with respect to the development of any of our product candidates would significantly change the costs and timing associated with the development of that product candidate.
Research and development expenses consist primarily of costs incurred for our research activities, including our drug discovery efforts, and the development of our product candidates, which include:
employee-related expenses, including salaries, benefits and stock-based compensation expense;
expenses incurred under agreements with third parties, including contract research organizations, or CROs, that conduct research and development and both preclinical and clinical activities on our behalf, and the cost of consultants;
the cost of lab supplies and acquiring, developing and manufacturing preclinical and clinical study materials; and
facilities, depreciation, and other expenses, which include direct and allocated expenses for rent and the maintenance of facilities, insurance and other operating costs.
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In May 2022, we announced our determination to evolve our approach to exploratory research and drug discovery to focus on our existing late-lead optimization programs and to prioritize in-licensing or acquiring assets for pipeline growth. We reduced approximately 45 roles focused on exploratory research in connection with this evolution of our research organization, and retained an internal research team focused on roles critical to advancing our current and future late-stage research and early clinical programs.
The following summarizes our most advanced programs:
IDHIFA®PYRUKYND® (mitapivat): First-in-Class PK Activator
IDHIFA® is an orally available, selective, potent inhibitor of the mutated IDH2 protein, making it a highly targeted therapeutic candidateWe are developing PYRUKYND® for the treatment of patients with cancers that harbor IDH2 mutations, including those with AML, who have a historically poor prognosis. In August 2017, the FDA granted Celgene approval of IDHIFA® for the treatment of adult patients with R/R AMLPK deficiency and an IDH2 mutationother hemolytic anemias such as detected by an FDA-approved test.
The FDA has granted orphan drug designation for IDHIFA® for treatment of patients with AMLthalassemia and fast track designation for treatment of patients with AML that harbor an IDH2 mutation, and the EMA granted orphan drug designation for IDHIFA® for the treatment of AML.
We continue to evaluate IDHIFA® in the following clinical trials, which are led and funded by Celgene:
A phase 1/2 multicenter, open-label, clinical trial, initially conducted by us but which Celgene has assumed primary responsibility for, to assess the safety, clinical activity, and tolerability of IDHIFA® in patients with advanced hematologic malignancies with an IDH2 mutation.
A phase 1b, multicenter, international, open-label clinical trial, conducted by us, to evaluate the safety and clinical activity of IDHIFA® or ivosidenib in combination with induction and consolidation therapy in patients with newly diagnosed AML with an IDH2 or IDH1 mutation who are eligible for intensive chemotherapy.
A phase 1/2 frontline combination clinical trial, conducted by Celgene, of either IDHIFA® or ivosidenib in combination with VIDAZA® (azacitidine) in newly diagnosed AML patients not eligible for intensive chemotherapy, with a phase 1 component to determine the safety of the combinations, followed by a phase 2 randomized component evaluating the safety and clinical activity of the IDHIFA® investigational combination versus single-agent VIDAZA® using a primary endpoint of overall response rate, or ORR.
IDHENTIFY, an international phase 3, multi-center, open-label, randomized clinical trial, conducted by Celgene, designed to compare the efficacy and safety of IDHIFA® versus conventional care regimens in patients 60 years or older with IDH2 mutant-positive AML that is refractory to or relapsed after second- or third-line therapy.
We plan to support, with Celgene, the initiation of an intergroup sponsored, global, registration-enabling phase 3 trial combining ivosidenib or IDHIFA® and standard induction (7+3) and consolidation chemotherapy with a primary endpoint of event-free survival in frontline AML patients with an IDH1 or IDH2 mutation in the fourth quarter of 2018.
Ivosidenib
Ivosidenib is our wholly owned, orally available, selective, potent inhibitor of the mutated IDH1 protein, making it a highly targeted therapeutic candidate for the treatment of patients with cancers that harbor IDH1 mutations. Mutations in IDH1 have been identified in difficult to treat hematologic and solid tumor cancers, including AML, chondrosarcoma, cholangiocarcinoma and glioma where both the treatment options and prognosis for patients are poor. The FDA has granted us fast track designation to ivosidenib for treatment of patients with AML that harbor an IDH1 mutation and orphan drug designation for ivosidenib for treatment of patients with AML. The FDA has also granted fast-track designation to ivosidenib for treatment of patients with previously treated, unresectable or metastatic cholangiocarcinoma with and IDH1 mutation. In December 2017, we submitted

an NDA to the FDA for ivosidenib for the treatment of patients with R/R AML and an IDH1 mutation. We plan to submit an MAA to the EMA for ivosidenib for IDH1 mutant-positive R/R AML in the fourth quarter of 2018.
We are evaluating ivosidenib in the following clinical trials:
A phase 1 multicenter, open-label, dose-escalation and expansion clinical trial, designed to assess its safety, clinical activity and tolerability as a single agent in patients with advanced hematologic malignancies with an IDH1 mutation.
As discussed above, a phase 1b, multicenter, international, open-label clinical trial to evaluate the safety and clinical activity of IDHIFA® or ivosidenib in combination with induction and consolidation therapy in patients with newly diagnosed AML with an IDH2 or IDH1 mutation who are eligible for intensive chemotherapy.
As discussed above, a phase 1/2 frontline combination clinical trial, conducted by Celgene, of either IDHIFA® or ivosidenib in combination with VIDAZA® (azacitidine) in newly diagnosed AML patients not eligible for intensive chemotherapy.
AGILE, a global, registration-enabling phase 3 clinical trial, combining ivosidenib and VIDAZA® in newly diagnosed AML patients with an IDH1 mutation who are ineligible for intensive chemotherapy.
A phase 1 multicenter, open-label, dose-escalation and expansion clinical trial, designed to assess its safety, clinical activity and tolerability as a single agent in patients with advanced solid tumors with an IDH1 mutation, including glioma, cholangiocarcinoma, and chondrosarcoma.
ClarIDHy, a registration-enabling phase 3, multicenter, randomized, double-blind, placebo-controlled clinical trial of ivosidenib in previously-treated patients with nonresectable or metastatic cholangiocarcinoma with an IDH1 mutation.
As discussed above, we plan to support, with Celgene, the initiation of an intergroup sponsored, global, registration-enabling phase 3 trial combining ivosidenib or IDHIFA® and standard induction (7+3) and consolidation chemotherapy with a primary endpoint of event-free survival in frontline AML patients with an IDH1 or IDH2 mutation in the fourth quarter of 2018.
AG-881: brain penetrant pan-IDH program
AG-881 is an orally available, selective, brain-penetrant, pan-IDH mutant inhibitor, which provides added flexibility to our current portfolio of IDH mutant inhibitors. We are currently focusing our development efforts for AG-881 in glioma.
We are evaluating AG-881 in two phase 1 multi-center, open-label clinical trials of AG-881, one in patients with advanced IDH1 or IDH2 mutant-positive solid tumors, including glioma, and the other in patients with advanced IDH1 or IDH2 mutant-positive hematologic malignancies whose cancer has progressed on a prior IDH inhibitor therapy.
In the first half of 2018, we intend to initiate a perioperative study with ivosidenib and AG-881 in low grade glioma to further investigate their effects on brain tumor tissue. Pursuant to the AG-881 Agreements, Celgene has elected not to participate in this clinical trial and, as a result, we will fund the trial ourselves. Celgene will continue to co-fund the ongoing phase 1 trials of AG-881 described above.
AG-348: PK Deficiency Program
AG-348SCD. PYRUKYND® is an orally available small molecule and a potent activator of the wild-type (normal) and mutated PKR enzyme, onePK enzymes.
In February 2022, the FDA approved PYRUKYND® for the treatment of several tissue-specific isoformshemolytic anemia in adults with PK deficiency in the United States. In November 2022, we received marketing authorization from the European Commission for PYRUKYND® for the treatment of PK deficiency in adult patients in the EU. In December 2022, we received marketing authorization in Great Britain for PYRUKYND® for the treatment of PK enzyme.deficiency in adult patients under the European Commission Decision Reliance Procedure. In addition, we are currently evaluating PYRUKYND® in clinical trials for the treatment of thalassemia, SCD, and in pediatric patients with PK deficiency. We have shown that AG-348 can restore Adenosine-5’-triphosphate levelsworldwide development and decrease 2,3-diphosphoglycerate, or 2,3-DPG, levelscommercial rights to PYRUKYND® and expect to fund the future development and commercialization costs related to this program. PYRUKYND® has been granted orphan drug designation for the treatment of PK deficiency by the FDA and the EMA. Additionally, PYRUKYND® has received orphan drug designation from the FDA for the treatment of thalassemia and SCD.
We have built our commercial infrastructure to support the commercial launch of PYRUKYND® in blood sampled fromadult PK deficiency in the United States. In connection with our regulatory approvals in the EU and Great Britain, we are currently providing access to PYRUKYND® free of charge for eligible patients in those jurisdictions through a global managed access program. We may provide access to PYRUKYND® for adult patients with PK deficiency when treated ex-vivo with AG-348. The wild-type PKR activityin other jurisdictions upon request through the global managed access program, on either a free of AG-348 allowedcharge or for charge basis. Beyond the studyglobal managed access program, we continue to evaluate options for the commercialization of enzyme activation in healthy volunteers, providing an opportunity to understandPYRUKYND® outside of the safety, dosing and pharmacodynamic activity of AG-348 prior to entering a proof-of-concept study in patients, and provides forUnited States, including through exploring potential expansion opportunities into other anemias. The FDA granted us orphan drug designation for AG-348 for treatment of patients with PK deficiency.partnership opportunities.
We are evaluating AG-348PYRUKYND® in the following clinical trials:
An extension study evaluating the long-term safety, tolerability and efficacy of treatment with PYRUKYND® in patients from ENERGIZE, our completed phase 3, double-blind, randomized, placebo-controlled multicenter study pivotal trial of PYRUKYND® in adults with non-transfusion-dependent alpha- or beta-thalassemia. We announced topline data for ENERGIZE in January 2024. A total of 194 patients were enrolled in the study, with 130 randomized to PYRUKYND® 100 mg twice-daily, and 64 randomized to matched placebo. 122 patients (93.8%) in the PYRUKYND® arm and 62 patients (96.9%) in the placebo arm completed the 24-week double-blind period of the study. The study met the primary endpoint of hemoglobin response, where treatment with PYRUKYND® demonstrated a statistically significant increase in hemoglobin response compared to placebo, as 42.3% of patients in the PYRUKYND® arm achieved a hemoglobin response, compared to 1.6% of patients in the placebo arm (2-sided p<0.0001). Treatment with PYRUKYND® also demonstrated statistically significant improvements compared to placebo for both key secondary endpoints: (i) change from baseline in average Functional Assessment of Chronic Illness Therapy-Fatigue, or FACIT-Fatigue, subscale score from week 12 to week 24 and (ii) change from baseline in average emoglobin concentration from week 12 to week 24. During the 24-week double-blind period, four (3.1%) subjects in the PYRUKYND® arm experienced adverse events, or AEs, leading to discontinuation, and there were no AEs in the placebo arm leading to discontinuation. We plan to provide a more detailed analysis of the data from this trial at an upcoming medical meeting and we aim to submit an NDA for PYRUKYND® in thalassemia to the FDA by the end of 2024.
ENERGIZE-T, a phase 3, double-blind, randomized, placebo-controlled multicenter study evaluating the efficacy and safety of PYRUKYND® as a potential treatment for adults with transfusion-dependent alpha- or beta-thalassemia, defined as 6 to 20 RBC units transfused and ≤ six-week transfusion-free period during the 24-week period before randomization. The primary endpoint of the trial is percentage of patients with transfusion reduction response, defined as a ≥50% reduction in transfused RBC units with a reduction of ≥2 units of transfused RBCs in any consecutive 12-week period through week 48 compared with baseline. Secondary endpoints include additional transfusion reduction measures and percentage of participants with transfusion-independence. This trial has completed enrollment and we plan to announce topline data from this trial in mid-2024.
RISE UP, a phase 2/3 study evaluating the efficacy and safety of PYRUKYND® in SCD patients who are 16 years of age or older, have had between two and 10 sickle cell pain crises in the past 12 months, and have hemoglobin within the range of 5.5 to 10.5 g/dL during screening. We enrolled 79 patients in the phase 2 portion of the trial, with 26 patients in the 50 mg twice daily mitapivat arm, 26 patients in the 100 mg twice daily mitapivat arm and 27 patients in the placebo arm. The primary endpoints of the phase 2 portion of the trial were hemoglobin response, defined as defined as ≥ 1 g/dL
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increase in average hemoglobin concentration from week 10 to week 12 compared to baseline, and safety. In June 2023, we announced the phase 2 portion of this trial had achieved its primary endpoint of hemoglobin response in patients in both 50 mg and 100 mg twice daily mitapivat arms. 46.2% of patients (n=12) in the 50 mg twice daily mitapivat arm and 50.0% of patients (n=13) in the 100 mg twice daily mitapivat arm achieved a hemoglobin response, compared to 3.7% of patients (n=1) in the placebo arm (2-sided p=0.0003 and 0.0001, respectively). In December 2023, we announced the following additional results of the phase 2 portion of the trial: (i) the least-squares mean (95% confidence interval) for average change from baseline in hemoglobin levels, from week 10 through week 12, for patients in the 50 mg twice daily mitapivat, 100 mg twice daily mitapivat, and placebo arms, respectively, was 1.11 (0.77, 1.45) g/dL, 1.13 (0.79, 1.47) g/dL, and 0.05 (−0.28, 0.39) g/dL; (ii) we observed improvements in annualized rates of sickle cell pain crises as the annualized rate of sickle cell pain crises (95% confidence interval) for patients in the 50 mg twice daily and 100 mg twice daily mitapivat arms, respectively, was 0.83 (0.34, 1.99) and 0.51 (0.16, 1.59), compared to 1.71 (0.95, 3.08) for patients in the placebo arm; (iii) we observed improvement in patient-reported fatigue scores in the 50 mg twice daily mitapivat arm compared to the placebo arm, and the least-squares mean (95% confidence interval) for average changes from baseline in patient-reported fatigue score, from week 10 through week 12, for patients in the 50 mg twice daily mitapivat, 100 mg twice daily mitapivat, and placebo arms, respectively, was −3.80 (−7.16, −0.45), −0.10 (−3.27, 3.08), and −0.17 (−3.40, 3.07). The safety profile for mitapivat observed in the phase 2 portion of the trial was generally consistent with previously reported data in other studies of SCD and other hemolytic anemias. The most common treatment-emergent AEs in the 50 mg BID, 100 mg BID, and placebo arms, respectively, were: headache (n=6, 6, 7), arthralgia (n=3, 5, 9), dysmenorrhea (n=0, 3, 0), pain (n=3, 3, 2), pain in extremity (n=1, 3, 6), back pain (n=4, 2, 3), nausea (n=1, 2, 4), fatigue (n=4, 1, 5), and influenza-like illness (n=1, 1, 3). There were no serious treatment-emergent adverse events, or TEAEs, attributed to mitapivat and there were no adverse events leading to drug reduction, discontinuation, interruption or death in either the mitapivat or the placebo arms. Of the 79 patients enrolled in the study, 73 continued into the Phase 2 open-label extension period. In October 2023, we enrolled the first patient in the phase 3 portion of this trial. The phase 3 portion includes a 52-week randomized, placebo-controlled period in which participants will be randomized in a 2:1 ratio to receive the recommended (100 mg twice daily) PYRUKYND® dose level or the placebo. The primary endpoints are hemoglobin response, defined as ≥1 g/dL increase in average hemoglobin from baseline to week 52, and annualized rate of sickle cell pain crises. Participants who complete either the phase 2 or phase 3 portion will have the option to move into a 216-week open-label extension period to continue to receive PYRUKYND®. We anticipate completing enrollment by the end of 2024 and announcing topline data for this trial in 2025.
ACTIVATE-kids and ACTIVATE-kidsT, double-blind phase 3 studies evaluating the efficacy and safety of PYRUKYND® as a potential treatment for PK deficiency in not regularly transfused and regularly transfused patients between one and 18 years old, respectively. The primary endpoint of ACTIVATE-kids is percentage of patients with hemoglobin response, defined as ≥1.5 g/dL increase in hemoglobin concentration from baseline that is sustained at two or more scheduled assessments at weeks 12, 16, and 20 during the double-blind period. The primary endpoint of ACTIVATE-kidsT is transfusion reduction response, defined as ≥33% reduction in total RBC transfusion volume from week 9 through week 32 of the double-blind period. ACTIVATE-kidsT has completed enrollment and we expect to announce topline data for this trial by the end of 2024. ACTIVATE-kids is currently enrolling patients, we expect to complete enrollment for this trial by mid-2024, and we anticipate announcing topline data for this trial in 2025.
An extension study evaluating the long-term safety, tolerability and efficacy of treatment with PYRUKYND® in patients from ACTIVATE and ACTIVATE-T, our completed pivotal trials of PYRUKYND® in not regularly transfused and regularly transfused adult patients with PK deficiency.
An extension study evaluating the long-term safety, tolerability and efficacy of treatment with PYRUKYND® in patients from DRIVE PK, aour completed global phase 2, first-in-patient, open-label safety and efficacy clinical trial of AG-348PYRUKYND® in adult, transfusion-independentnot regularly transfused patients with PK deficiency.
An extension study evaluating the safety, tolerability and efficacy of treatment with PYRUKYND® in patients from our completed phase 2, open-label safety and efficacy clinical trial of PYRUKYND® in adults with non-transfusion-dependent alpha- and beta-thalassemia.
In collaboration with the Company, the National Institutes of Health, or NIH, is evaluating PYRUKYND® in a phase 1 trial in patients with SCD pursuant to a cooperative research and development agreement. The multi-center, randomizedcore trial includes two armsperiod has completed, and the long-term extension study is ongoing. In June 2020, clinical proof of concept was established based on a preliminary analysis of the data from this trial.
In collaboration with the Company, University Medical Center Utrecht, or UMC Utrecht, is evaluating PYRUKYND® in patients with SCD pursuant to an investigator sponsored trial agreement. The trial has completed enrollment and patient follow-up is ongoing, and a 2-year extension study has been initiated for patients who complete the follow-up period.
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AG-946: Novel PK Activator
We are developing AG-946, a novel PK activator, for the potential treatment of LR MDS and hemolytic anemias. We are evaluating AG-946 in a phase 1 trial of AG-946 in healthy volunteers and in patients with SCD. We have presented data from the healthy volunteer cohorts, and we have initiated the SCD patient cohort of this phase 1 trial.
We initiated a phase 2a clinical trial of AG-946 in adults with LR MDS in the third quarter of 2022, and the trial has completed enrollment with 22 patients, including 12 patients classified as non-transfused and 10 patients classified as low transfusion burden. Patients received 5 mg of AG-946 once daily for up to 2516 weeks. The two primary endpoints of the trial were transfusion independence (for patients each.classified as low transfusion burden), defined as transfusion-free for ≥ eight consecutive weeks during the 16-week treatment period, and hemoglobin response, defined as a ≥ 1.5 g/dL increase from baseline in the average hemoglobin concentration measured from week 8 through week 16.
In November 2023, we announced that we achieved clinical proof-of-concept in the phase 2a portion of the trial. We observed that four of the 10 patients with low transfusion burden achieved the transfusion independence endpoint, and one of the 22 patients achieved the hemoglobin response endpoint in the 16-week treatment period. The safety profile observed was consistent with data reported in the healthy volunteer study of AG-946. 19 patients elected to enroll in the extension period for up to 156 weeks. We intend to complete a full evaluation of the phase 2a trial results and assess the impact on the phase 2b portion of the protocol in 2024. We anticipate initiating a phase 2b trial of AG-946 in adults with LR MDS in mid-2024.
Other Programs
In addition to the aforementioned development programs, we are developing AG-181, a PAH stabilizer for the potential treatment of PKU, for which we filed an investigational new drug, or IND, application in December 2023, and plan to initiate two global, pivotal trials of AG-348a phase 1 study in PK deficiencyhealthy volunteers in the first half of 2018: ACTIVATE-T,2024. Also, in July 2023, we entered into a single arm trial of approximately 20 regularly transfused patients, is expected to initiate in the first quarter of 2018, and ACTIVATE, a 1:1 randomized, placebo-controlled trial of 80 patients who do not receive regular transfusions, is expected to initiate in the second quarter of 2018.
In addition to the above planned and ongoing clinical trials of AG-348, we plan to initiate a phase 2 proof of concept trial of AG-348 in thalassemia in the fourth quarter of 2018.

AG-270: Targeting MAT2Alicense agreement with Alnylam for the development and commercialization of products containing or comprised of an siRNA preclinical development candidate discovered by Alnylam and targeting the TMPRSS6 gene, and we intend to pursue development of a licensed product for the potential treatment of MTAP-deleted cancerspatients with PV.
AG-270, a MAT2A inhibitor, is our development candidate focused on MTAP-deleted cancers. We submitted an IND for AG-270 in November 2017 and, in December 2017, the FDA concluded that we may proceed with a proposed phase 1 dose-escalation trial in multiple tumor types carrying an MTAP deletion, which we expect to initiate in the first quarter of 2018.
Targeting DHODH for the treatment of hematologic malignancies
In January 2018, we announced that we plan to submit an IND in the fourth quarter of 2018 for our latest development candidate, an inhibitor of DHODH, licensed by us from Aurigene Discovery Technologies Limited, for the treatment of hematologic malignancies. We have discovered a lineage-specific dependence on DHODH in hematologic malignancies, particularly AML and diffuse large B-cell lymphoma. DHODH catalyzes a critical step in the biosynthesis of pyridimidines, which are critical for the production of RNA and DNA. We believe that DHODH inhibition will be differentiated from standard-of-care therapies, both by exhibiting activity in cancers that are resistant to standard-of-care chemotherapeutics and through a mechanism of anti-tumor effect that combines cell growth arrest and cellular differentiation.
AG-519
AG-519 is an orally available small molecule and is a potent activator of the PKR enzyme, with comparable biochemical, cellular and in-vivo activity to AG-348, and was developed as our second PKR activator. We were evaluating AG-519 in a placebo-controlled phase 1 integrated single ascending dose and multiple ascending dose clinical trial in healthy volunteers. In December 2016, we announced that we are no longer developing AG-519 and withdrew our IND for AG-519, following a verbal notification of a clinical hold from the FDA.
Other research and platform programs
Other research and platform programs include activities related to exploratory efforts, target validation and lead optimization for our discovery and follow-on programs, and our proprietary metabolomics platform.
Selling, General and administrative expensesAdministrative Expenses
GeneralSelling, general and administrative expenses consist primarily of salaries and other related costs, including stock-based compensation, for personnel in executive, finance, accounting, business development, commercial, legal, information technology and human resources functions. Other significant costs include facilityfacility-related costs not otherwise included in research and development expenses, legal fees relating to patent and corporate matters, and fees for accounting and consulting services.
We anticipate that our selling, general and administrative expenses will increase in the future to support continued research and development activities and potentialongoing and future commercialization activities related to our portfolio, including the ongoing commercialization of PYRUKYND® and any of our other product candidates. These increases will likelycandidates, which may include increased costs related to the hiring of additional personnelpersonnel.
Impact of COVID-19 on our Business
As of December 31, 2023, we have not experienced a significant financial or supply chain impact directly related to the recent COVID-19 pandemic, but have experienced some disruptions to clinical operations and feescertain clinical and research activities at our contract research organizations, or CROs. Although the public health emergency declaration related to outside consultants, lawyersCOVID-19 ended on May 11, 2023, the extent of the effect of any future pandemics or public health emergencies on our operational and accountants, among other expenses.financial performance will depend in large part on future developments, which cannot be predicted and are out of our control.
Critical Accounting Policies and Significant Judgments and Estimates
Our management’s discussion and analysis of our financial condition and results of operations are based on our consolidated financial statements, which we have prepared in accordance with accounting principles generally accepted in the United States. The preparation of these consolidated financial statements requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements, as well as the reported amounts of revenue and expenses during the reporting periods. On an ongoing basis, we evaluate our estimates and judgments. We base our estimates on historical experience and on various other factors that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions.
While our significant accounting policies are described in more detail in the notes to our consolidated financial statements included elsewhere in this Annual Report on Form 10-K, we believe that the following accounting policies are the most critical to aid you in fully understanding and evaluating our financial condition and results of operations.operations and are policies that require a significant level of judgment and estimates.
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Revenue recognition
We recognize revenue in accordance with the Financial Accounting Standards Board’s, or FASB,Under Accounting Standards Codification 606, Revenue from Contracts with Customers, or ASC 605, Revenue Recognition. Accordingly,606, revenue is recognized when the customer obtains control of promised goods or services, in an amount that reflects the consideration that we expect to receive in exchange for each unitthose goods or services. To determine revenue recognition for arrangements that have been determined to be within the scope of accounting when all ofASC 606, we perform the following criteria are met:
persuasive evidence of an arrangement exists;
delivery has occurred or services have been rendered;

five steps: (i) identify the seller’scontract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the buyerperformance obligations in the contract; and (v) recognize revenue when (or as) we satisfy a performance obligation. We only apply the five-step model to contracts when it is fixedprobable that we will collect the consideration we are entitled to in exchange for the goods or determinable;services we transfer to the customer.
This standard applies to all contracts with customers, except for contracts that are within the scope of other standards, such as leases, insurance, collaboration arrangements and financial instruments.
collectabilityOnce the contract is reasonably assured.determined to be within the scope of ASC 606, we assess the goods or services promised within each contract and determine those that are performance obligations, and assess whether each promised good or service is distinct. We will then recognize as revenue the amount of the transaction price that is allocated to the respective performance obligation when (or as) the performance obligation is satisfied.
Amounts received priorProduct Revenue
We generate product revenue from sales of PYRUKYND® to satisfyinga limited number of specialty distributors and specialty pharmacy providers, or collectively, the Customers. These Customers subsequently resell PYRUKYND® to pharmacies or dispense PYRUKYND® directly to patients. In addition to distribution agreements with Customers, we enter into arrangements with healthcare providers and payors that provide for government-mandated and/or privately-negotiated rebates, chargebacks and discounts with respect to the purchase of PYRUKYND®.
The performance obligation related to the sale of PYRUKYND® is satisfied and revenue recognition criteriais recognized when the Customer obtains control of the product, which occurs at a point in time, typically upon delivery to the Customer.
Revenues from product sales are recorded at the net sales price, or transaction price, which includes estimates of variable consideration for which reserves are established and result from contractual adjustments, government rebates, returns and other allowances that are offered within the contracts with our Customers, healthcare providers, payors and other indirect customers relating to the sale of our products.
Contractual Adjustments. We generally provide Customers with discounts, including prompt pay discounts, and allowances that are explicitly stated in the contracts and are recorded as deferred revenue. Amounts expected to be recognized asa reduction of revenue within the 12 months following the balance sheet date are classified current and amounts not expected to be recognized as revenue within the 12 months following the balance sheet date are classified as non-current.
Collaboration and License Revenue
We account for the collaboration agreements with Celgene under ASC 605-25, Revenue Recognition - Multiple-Element Arrangements, or ASC 605-25. Pursuant to ASC 605-25, revenue arrangements where multiple products or services are sold together are evaluated to determine if each deliverable represents a separate unit of accounting based on the following criteria:
Delivered item or items have value to the customer on a standalone basis, and
If the arrangement includes a general right of return relative to the delivered item or items, delivery or performance of the undelivered item or items is considered probable and substantially in the control of the vendor.
If a deliverable meets both criteria above, it is considered a separate unit of accounting. If a deliverable does not meet both criteria above, it will be evaluated in combination with other deliverables and, if appropriate, aggregated to form one unit of accounting. The arrangement consideration is then allocated to each unit of accounting based on the relative selling price, using our best estimate of selling price, or BESP, of each unit of accounting, if vendor specific objective evidence or third party evidence is not available. The provisions of ASC 605-25 are then applied to each unit of accounting to determine the appropriate revenue recognition.
We recognize revenue for the units of accounting over the term of the related contract or as undelivered items are delivered (proportional performance method), as appropriate. Under the proportional performance method, the consideration allocated to each unit of accounting is recognized as revenue based on the ratio of the level of effort incurred to date compared to the total estimated level of effort required to complete our performance obligations under the unit of accounting. Determining the total estimated level of effort required to complete all performance obligations requires judgment and estimation, including assumptions regarding future operating performance, the timelines of the clinical trial approvals and the estimated patient populations.
Reimbursement of research and development costs under our collaboration agreements with Celgene are recognized as revenue, provided that we are acting as the principal in the transaction according to the provisions outlined in ASC 605-45, Revenue Recognition – Principal Agent Considerations, the amounts are determinable, and collection of the related receivable is reasonably assured.
Milestone Revenue
We apply the provisions of ASC 605-28, Revenue Recognition – Milestone Method, or ASC 605-28, pursuant to which we recognize revenue contingent upon the achievement of a milestone in its entirety in the period in which the milestonerelated product revenue is achieved, only ifrecognized. In addition, we receive sales order management, data and distribution services from certain Customers.
Chargebacks and discounts represent the milestone meets allestimated obligations resulting from contractual commitments to sell products to qualified healthcare providers at prices lower than the criteria withinlist prices charged to Customers who directly purchase the guidanceproduct from us. Customers charge us for the difference between what they pay for the product and the ultimate selling price to be considered substantive. In accordance with ASC 605-28, at the inceptionqualified healthcare providers. These reserves are estimated using the expected value method, based upon a range of each arrangementpossible outcomes that includes milestone payments, we evaluate each contingent payment on an individual basis to determine whether they are considered substantive milestones, specifically reviewing factors such asprobability-weighted for the degree of certainty in achieving the milestone, the researchestimated channel mix and development risk and other risks that must be overcome to achieve the milestone, as well as the level of effort and investment required and whether the milestone consideration is reasonable relative to all deliverables and payment termsare established in the arrangement. This evaluation includessame period that the related revenue is recognized, resulting in a reduction of product revenue.
Government Rebates. Government rebates include Medicare, TriCare, and Medicaid rebates, which we estimate using the expected value method, based upon a range of possible outcomes that are probability-weighted for the estimated payor mix. These reserves are recorded in the same period the related revenue is recognized, resulting in a reduction of product revenue. For Medicare, we also estimate the number of patients in the prescription drug coverage gap for whom we will owe an assessmentadditional liability under the Medicare Part D program.
Returns. We estimate the amount of whether (a) the consideration is commensurate with either (1) our performance to achieve the milestone, or (2) the enhancement of the value of the delivered item(s)product sales that may be returned by Customers and record this estimate as a resultreduction of a specific outcome resulting fromrevenue in the period the related product revenue is recognized. We currently estimate product return liabilities using the expected value method, based on available industry data, including our performance to achievevisibility into the milestone, (b)inventory remaining in the consideration relates solely to past performance, and (c) the consideration is reasonable relative to alldistribution channel.
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Revenue from milestones, if they are nonrefundable and deemed substantive, are recognized upon achievement of the milestones. We recognize revenue associated with non-substantive milestones upon achievement of the milestone if there are no undelivered elements and we have no remaining performance obligations.
Accrued researchResearch and development expensesDevelopment Expenses
As part of the process of preparing our consolidated financial statements, we are required to estimate our accrued expenses. This process involves reviewing quotations and contracts, identifying services that have been performed on our behalf and estimating the level of service performed and the associated cost incurred for the service when we have not yet been invoiced or otherwise notified of the actual cost. Certain service providers invoice us in arrears for services performed or when contractual milestones are met. We make estimates of our accrued expenses as of each balance sheet date in our financial

statements based on facts and circumstances known to us at that time. We periodically confirm the accuracy of our estimates with the service providers and make adjustments, if necessary. Examples of estimated accrued research and development expenses include fees paid to:
(i) CROs and other third parties in connection with clinical studies;
studies and preclinical development activities; (ii) investigative sites in connection with clinical studies;
vendors in connection with preclinical development activities; and
vendors (iii) third parties related to product manufacturing, development and distribution of clinical supplies.
We base our expenses related to CROs on our estimates of the services received and efforts expended pursuant to quotes and contracts with CROs that conduct research and development on our behalf. The financial terms of these agreements are subject to negotiation, vary from contract to contract and may result in uneven payment flows. There may be instances in which payments made to our vendors will exceed the level of services provided and result in a prepayment of the research and development expense. In accruing service fees, we estimate the time period over which services will be performed and the level of effort to be expended in each period. If the actual timing of the performance of services or the level of effort varies from our estimate, we adjust the accrual or prepaid accordingly. Although we do not expect our estimates to be materially different from amounts actually incurred, our understanding of the status and timing of services performed relative to the actual status and timing of services performed may vary and could result in us reporting amounts that are too high or too low in any particular period.
Stock-based compensationCompensation
We account for stock-based compensation awards in accordance with ASC 718, Compensation –Stock Compensation, or ASC 718. For stock-based awards granted to employees, non-employees and to members of the board of directors for their services and for participation in our employee stock purchase plan, we estimate the grant date fair value of each option award using the Black-Scholes option-pricing model. The use of the Black-Scholes option-pricing model requires us to make assumptions with respect to the expected term of the option, the expected volatility of the common stock consistent with the expected life of the option, risk-free interest rates and expected dividend yields of the common stock.
Expected term. We use the “simplified method” as prescribed by the Securities and Exchange CommissionSEC Staff Accounting Bulletin No. 107, Share Based Payments, to estimate the expected term of stock option grants. Under this approach, the weighted-average expected life is presumed to be the average of the contractual term of ten years and the weighted-average vesting term of the our stock options, taking into consideration multiple vesting tranches. We utilize this method due to lack of historical data and the plain-vanilla nature of our share-based awards.
Volatility. We use a weighted-average of expected volatility based on the volatilities of a representative group of publicly traded biopharmaceutical companies, including ourselves. The expected volatility has been determined using a weighted-average of theAgios' historical volatilities of the representative group of companies for a period equal to the expected term of the option grant.
Risk-free rate. The risk-free rate is based on the yield curve of U.S. Treasury securities with periods commensurate with the expected term of the options being valued.
Dividends. We have never paid, and do not anticipate paying, any cash dividends in the foreseeable future, and, therefore, use an expected dividend yield of zero in the option-pricing model.
Forfeitures. We account for forfeitures as they occur and, therefore, do not estimate forfeitures.
For awards subject to service-based vesting conditions, we recognize stock-based compensation expense equal to the grant date fair value of stock options on a straight-line basis over the requisite service period.period. For awards subject to both performance and service-basedperformance-based vesting conditions, we recognize stock-based compensation expense over the remaining service period if the performance condition is considered probable of achievement using management’s best estimates.

Discontinued Operations
We accounted for the sale of our oncology business in the first quarter of 2021 in accordance with ASC 205, Discontinued Operations and Accounting Standards Update, or ASU, No. 2014-08, Reporting of Discontinued Operations and Disclosures of Disposals of Components of an Entity. We followed the held-for-sale criteria as defined in ASC 360, Property, Plant and Equipment, and ASC 205. ASC 205 requires that a component of an entity that has been disposed of or is classified as held for sale and has operations and cash flows that can be clearly distinguished from the rest of the entity be reported as assets held for sale and discontinued operations. In the period a component of an entity has been disposed of or classified as held for sale, the results of operations for the periods presented are reclassified into separate line items in the consolidated statements of operations. Assets and liabilities are also reclassified into separate line items on the related consolidated balance sheets for the
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periods presented. The statements of cash flows for the periods presented are also reclassified to reflect the results of discontinued operations as separate line items. ASU 2014-08 requires that only a disposal of a component of an entity, or a group of components of an entity, that represents a strategic shift that has, or will have, a major effect on the reporting entity’s operations and financial results be reported in the financial statements as discontinued operations. ASU 2014-08 also provides guidance on the financial statement presentations and disclosures of discontinued operations.
Due to the sale of our oncology business during the first quarter of 2021, in accordance with ASC 205, we have classified the results of the oncology business as discontinued operations in our consolidated statements of operations and cash flows for all periods presented, and refer to Note 15, Discontinued Operations. All amounts included in the notes to the consolidated financial statements relate to continuing operations unless otherwise noted.
Results of Operations
Certain prior-year amounts have been reclassified to conform with current presentation.
Comparison of years ended December 31, 20172023, 2022 and 20162021
Revenues
(In thousands)202320222021
Revenues:
Product revenue, net$26,823 $11,740 $— 
Milestone revenue— 2,500 — 
Total revenue$26,823 $14,240 $— 
Total Revenue – 2023 vs. 2022The following table summarizes our resultsincrease in total revenue of operations for$12.6 million in 2023 compared to 2022 was due to increased product revenue associated with PYRUKYND®, which was approved by the years ended December 31, 2017 and 2016, togetherFDA in February 2022, partially offset by revenue recognized in 2022 associated with the changeslicensing of intellectual property for our Friedreich's Ataxia preclinical program.

Total Revenue – 2022 vs. 2021 – The increase in those items in dollars and as a percentage ($ in thousands):
 Years Ended December 31,    
 2017 2016 $ Change % Change
Collaboration revenue – related party$41,074
 $69,892
 $(28,818) (41.2)%
Royalty revenue – related party1,937
 
 1,937
 NM
Total revenue43,011
 69,892
 (26,881)1
(38.5)%
Operating expenses:       
Research and development (net of $7,811 and $19,714 of cost reimbursement from related party for the years ended December 31, 2017 and 2016, respectively)292,681
 220,163
 72,518
 32.9 %
General and administrative71,124
 50,714
 20,410
 40.2 %
Loss from operations(320,794) (200,985) (119,809) 59.6 %
Interest income6,124
 2,514
 3,610
 143.6 %
Net loss$(314,670) $(198,471) $(116,199) 58.5 %
Revenue. For the year ended December 31, 2017, we recognized $43.0total revenue of $14.2 million in 2022 compared to 2021 was due to product revenue associated with PYRUKYND®, which includes $41.1 million related to deliverables identified underwas approved in February 2022, and revenue recognized associated with the 2016 Agreement and $1.9licensing of intellectual property for our Friedreich's Ataxia preclinical program.
Total Operating Expenses
(In thousands)202320222021
Operating expenses
Cost of sales$2,881 $1,704 $— 
Research and development295,526 279,910 256,973 
Selling, general and administrative119,903 121,673 121,445 
Total Operating Expenses$418,310 $403,287 $378,418 
Total Operating Expenses – 2023 vs. 2022 – The increase in total operating expenses of $15.0 million in royalty revenue earned under the 2010 Agreement on Celgene sales2023 compared to 2022 was primarily due to an increase of IDHIFA®.
For the year ended December 31, 2016, we recognized $69.9$15.6 million in revenue, which includes a $25.0 million milestone payment related to the initiation of the Phase 3 IDHENTIFY trial of IDHIFA® under the 2010 Agreement.
Research and development expense. The increase in research and development expenses, which is described below under Research and Development Expenses.
Total Operating Expenses – 2022 vs 2021 – The increase in total operating expenses of $24.9 million in 2022 compared to 2021 was primarily attributabledue to net increasesan increase of $40.4$22.9 million in external services and $32.1 million in internal expenses; both of these increases are inclusive of reimbursement of costs under our collaboration agreements recorded as a reduction of research and development expenses.expenses, which is described below under Research and Development Expenses.
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Research and Development Expenses
Our allocated research and development expenses, by major program, are outlined in the table below ($ in thousands):below:
(In thousands)202320222021
PK activator (PYRUKYND®)$101,322 $83,271 $73,999 
Novel PK activator (AG-946)18,267 15,747 10,658 
In-process research and development17,500 — — 
Other research and platform programs11,492 26,837 22,959 
Total direct research and development expenses148,581 125,855 107,616 
Compensation and related expenses108,484 109,248 95,198 
Facilities and IT related expenses & other38,461 43,290 44,767 
Other expenses - transition services— 1,517 9,392 
Total indirect research and development expenses146,945 154,055 149,357 
Total research and development expense$295,526 $279,910 $256,973 
 Years Ended December 31,    
 2017 2016 $ Change % Change
IDH2 inhibitor (IDHIFA®)$7,695
 $10,912
 $(3,217) (29.5)%
IDHIFA® reduction of R&D expenses(14) (1,902) 1,888
 (99.3)%
IDH1 inhibitor (ivosidenib)136,319
 92,190
 44,129
 47.9 %
Ivosidenib reduction of R&D expenses(1)
 (9,873) 9,873
 (100.0)%
Pan IDH inhibitor (AG-881)17,590
 20,482
 (2,892) (14.1)%
AG-881 reduction of R&D expenses(7,797) (7,939) 142
 (1.8)%
PKR activator (AG-348)44,027
 19,104
 24,923
 130.5 %
MAT2A inhibitor (AG-270)20,982
 
 20,982
 NM
Discontinued backup PKR activator (AG-519)3,887
 30,563
 (26,676) (87.3)%
Other research and platform programs69,992
 66,626
 3,366
 5.1 %
Total research and development expenses, net$292,681
 $220,163
 $72,518
1
32.9 %
(1)Celgene and we agreed to terminate the 2010 Agreement, effective as of August 15, 2016, as to the program directed to the IDH1 target, for which ivosidenib is the lead development candidate. As a result of the termination, we obtained global development and commercial rights to ivosidenib and the IDH1 program and expect to fund all future development and commercialization costs related to the program. For the year ended December 31, 2016, we earned reimbursements of $10.8 million related to efforts under this program. As a result of the termination of the 2010 Agreement, we did not recognize a reduction in R&D expenses for the year ended December 31, 2017 and do not expect to recognize reductions in the future.

The changes in research and development expense depicted in the table were primarily attributable to the following:
IDHIFA® costs decreased as a result of less internal and external expenses related to ongoing translational work on clinical and preclinical biomarkers.
R&D costs reimbursed for IDHIFA® decreased as a result of Celgene assuming primary development responsibilities. The reimbursements are only representative of third-party costs.
Ivosidenib costs increased as a result of: (i) start-up costs for the AGILE clinical trial; (ii) initiation of the ClarIDHy clinical trial; (iii) the ongoing enrollment in the expansion portion of the phase 1 clinical trial evaluating single agent ivosidenib in patients with IDH1 mutant-positive advanced hematologic malignancies; and (iv) research and development activities, including manufacturing-related activities, needed to prepare the NDA submission, which was submitted to the FDA in December 2017.
R&D costs reimbursed for ivosidenib decreased as a result of our obtaining global development and commercial rights to ivosidenib and the IDH1 program, and the responsibility for funding all of the costs related to the program, upon terminating the 2010 Agreement with respect to the program, effective August 15, 2016.
AG-881 costs decreased as our phase 1 trial in patients with advanced IDH1 or IDH2 mutant-positive hematologic malignancies and our phase 1 trial in IDH1 or IDH2 mutant-positive advanced solid tumors, including glioma, both completed their dose escalation portions. However, we continue to incur costs related to patients continuing therapy on both studies and planning for future development.
As AG-881 development cost decreased, the R&D costs reimbursed for AG-881 also decreased.
AG-348 costs increased as a result of the selection of AG-348 as the lead product candidate in our PKR program instead of AG-519, which occurred in the fourth quarter of 2016.
AG-270 costs in 2017 include costs to file an IND, which occurred in December 2017. The costs in 2016 include costs to designate AG-270 as a development candidate.
AG-519 costs decreased as a result of the selection of AG-348 as the lead product candidate in our PKR program instead of AG-519, which occurred in the fourth quarter of 2016.
The increase in the costs of other research and platform programs includes activities related to exploratory efforts, target validation and lead optimization for our discovery and follow-on programs, and our proprietary metabolomics platform.
General and Administrative Expense. The increase in general and administrative expenses was primarily attributable to an increase of $21.1 million related to supporting our growing commercial organization for the launch of IDHIFA® and the potential launch of ivosidenib in 2018.
Interest Income. The increase in interest income is attributable to higher investment balances driven by upfront fees received under our 2016 Agreement, funds received from our April 2017 and September 2016 follow-on public offerings and a more diversified investment portfolio, resulting in higher interest earned on investments.
Comparison of years ended December 31, 2016 and 2015
The following table summarizes our results of operations for the years ended December 31, 2016 and 2015, together with the changes in those items in dollars and as a percentage ($ in thousands):
 Years Ended December 31,    
 2016 2015 $ Change % Change
Collaboration revenue – related party$69,892
 $59,119
 $10,773
 18.2%
Operating expenses:       
Research and development (net of $19,714 and $25,173 of cost reimbursement from related party for the years ended December 31, 2016 and 2015, respectively)220,163
 141,827
 78,336
 55.2%
General and administrative50,714
 35,992
 14,722
 40.9%
Loss from operations(200,985) (118,700) (82,285) 69.3%
Interest income2,514
 968
 1,546
 159.7%
Net loss$(198,471) $(117,732) $(80,739) 68.6%

Revenue. In May 2016, we entered into the 2016 Agreement pursuant to which we received a $200.0 million upfront payment and which required us to reevaluate the 2010 Agreement and AG-881 Agreements together with the 2016 Agreement. In addition, effective August 15, 2016, Celgene and we agreed to terminate the 2010 Agreement as to the ivosidenib program. For the year ended December 31, 2016, we recognized $69.9 million in revenue, which consists of $33.6 million related to new deliverables identified under the 2016 Agreement, including $10.8 million of revenue related to a change in estimate resulting from a reduction in the total level of effort required for a preclinical achievement of a program reaching earlier than planned, and the recognition of a $25.0 million milestone payment related to a substantial clinical development milestone achieved. No revenue associated with the ivosidenib program was recognized after the execution of the 2016 Agreement.
In April 2015, we entered into the AG-881 Agreements pursuant to which we received additional consideration and which required us to reevaluate the 2010 Agreement together with the AG-881 Agreements. For the year ended December 31, 2015, we recognized $59.1 million in revenue, which includes $27.8 million upon delivery of the ex-U.S. license for ivosidenib and U.S. and ex-U.S. licenses for AG-881.
Total Research and development expense.Development Expenses – 2023 vs. 2022 The increase in research and development expenses of $15.6 million in 2023 compared to 2022 was due to a $22.7 million increase in our direct expense offset by a $7.1 million decrease in our indirect expenses. The increase in direct expenses was primarily due to a $18.1 million increase in PYRUKYND® costs and in-process research and development from the $17.5 million up-front payment associated with the license agreement with Alnylam discussed above under Overview, offset by a $15.3 million decrease in other research and platform programs. The increase in PYRUKYND® costs was primarily due to increased costs for the phase 3 trials of PYRUKYND® in patients with thalassemia, ENERGIZE and ENERGIZE-T, and increased process development and medical affairs expenses. The decrease in other research and platform programs was primarily due to our decision to evolve our approach to exploratory research and drug discovery to focus on our existing late-lead optimization programs. The decrease in indirect expenses was primarily due to a $4.8 million decrease in facilities and IT related expenses & other due to a reduction in facility expenses associated with the evolution of our research organization, and the $1.5 million of reimbursable transition related services we provided to Servier in 2022 related to the sale of the oncology business for discovery, clinical development, technical operations, and related activities, which were completed during the three months ended March 31, 2022.
Total Research and Development Expenses – 2022 vs 2021 – The increase in research and development expenses of $22.9 million in 2022 compared to 2021 was due to an $18.2 million increase in our direct expenses and a $4.7 million increase in our indirect expenses. The increase in direct expenses was due to a $9.3 million increase in PYRUKYND® costs, a $5.1 million increase in AG-946 costs, and a $3.9 million increase in other research and platform programs. The increase in PYRUKYND® costs was primarily due to increased costs for the phase 3 trials of PYRUKYND® in patients with thalassemia, ENERGIZE and ENERGIZE-T, the phase 3 trials of PYRUKYND® in pediatric patients with PK deficiency, ACTIVATE-kids and ACTIVATE-kidsT, and the phase 2/3 trial of PYRUKYND® in patients with SCD, RISE UP, offset by closeouts of the ACTIVATE and ACTIVATE-T studies. The increase in AG-946 costs was primarily due to start-up costs for the phase 2 trial of AG-946 in patients with LR MDS and increased spend for the phase 1 trial of AG-946 in healthy volunteers and in patients with SCD. The increase in other research and platform programs was primarily driven by increased activity associated with our preclinical PAH program as well as increased activity on various other exploratory activities. The increase in indirect expenses was primarily due to a $14.1 million increase in compensation and related expenses primarily due to increased headcount, as well as certain workforce-related expenses associated with the evolution of our research organization. This increase was partially offset by $7.9 million of additional reimbursable transition related services we provided to Servier in 2021 compared to 2022 related to the sale of the oncology business for discovery, clinical development, technical operations, and related activities, which were completed during the three months ended March 31, 2022.
Other Income and Expense
(In thousands)202320222021
Gain on sale of contingent payments$— $127,853 $— 
Royalty income from gain on sale of oncology business— 9,851 6,639 
Interest income, net33,344 12,793 836 
Other income, net6,055 6,749 14,433 
Other Income and Expense 2023 vs. 2022 – The decrease in gain on sale of contingent payments and royalty income from gain on sale of oncology business in 2023 compared to 2022 was due to the sale to Sagard in the fourth quarter of 2022 of our rights to future contingent payments associated with royalties on U.S. next sales of TIBSOVO®. The $20.6 million increase in
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interest income, net in 2023 compared to 2022 is primarily attributable to an increase in interest rates. The $0.7 million decrease in other income, net in 2023 compared to 2022 primarily related to approximately $2.6 million of reimbursable transition related services and fees for the sale of the oncology business in 2022, partially offset by sublease income of $6.1 million in 2023 compared to $4.1 million in 2022.
Other Income and Expense 2022 vs 2021 – The $127.9 million gain on sale of contingent payments in 2022 was due to the October 27, 2022 sale of future contingent payments to entities affiliated with Sagard. The $12.0 million increase in interest income, net in 2022 compared to 2021 was primarily attributable to an increase in interest rates. The $3.2 million increase in royalty income from gain on sale of oncology business related to higher income from royalties on U.S. net increasessales of $46.5TIBSOVO® by Servier in 2022 compared to 2021. The $7.7 million decrease in other income, net in 2022 compared to 2021 primarily related to approximately $13.8 million of reimbursable transition related services and fees for the sale of the oncology business in 2021 compared to $2.6 million in external services and $31.82022, partially offset by sublease income of $4.1 million in internal expenses; both2022 compared to $0.5 million in 2021.
Loss from Operations and Net (Loss) Income
(In thousands)202320222021
Net loss from continuing operations$(352,088)$(231,801)$(356,510)
Net income from discontinued operations, net of tax— — 1,961,225 
Net (loss) income(352,088)(231,801)1,604,715 
Loss from Operations and Net Loss – 2023 vs 2022– The $120.3 million increase in net loss from continuing operations in 2023 compared to 2022 was primarily driven by the gain on sale of these increases are inclusive of reimbursement of costs recorded as a reduction of researchcontingent payments in 2022 described above in Other Income and development expenses.
Our allocatedExpense, higher research and development expenses by major program, are outlineddiscussed above under Research and Development Expenses, which includes the $17.5 million up-front payment associated with the license agreement with Alnylam discussed above under Overview, and the decrease in the table below ($ in thousands):
 Years Ended December 31,    
 2016 2015 $ Change % Change
IDH2 inhibitor (IDHIFA®)$10,912
 $17,537
 $(6,625) (37.8)%
IDHIFA® reduction of R&D expenses(1,902) (7,925) 6,023
1
(76.0)%
IDH1 inhibitor (ivosidenib)92,190
 61,651
 30,539
2
49.5 %
Ivosidenib reduction of R&D expenses(1)(9,873) (14,210) 4,337
3
(30.5)%
Pan IDH inhibitor (AG-881)20,482
 16,292
 4,190
4
25.7 %
AG-881 reduction of R&D expenses(7,939) (3,038) (4,901)5
161.3 %
PKR activator (AG-348)19,104
 19,597
 (493)6
(2.5)%
Discontinued backup PKR activator (AG-519)30,563
 6,820
 23,743
7
348.1 %
Other research and platform programs66,626
 45,103
 21,523
8
47.7 %
Total research and development expenses, net$220,163
 $141,827
 $78,336
9
55.2 %
(1)Celgene and we agreed to terminate the 2010 Agreement, effective as of August 15, 2016, as to the program directed to the IDH1 target, for which ivosidenib is the lead development candidate. As a result of the termination, we obtained global development and commercial rights to ivosidenib and the IDH1 program and expect to fund all future development and commercialization costs related to the program. For the year ended December 31, 2016, we earned reimbursements of $10.8 million related to efforts under this program.
The changes in research and development expense depicted in the table were primarily attributable to the following:
IDHIFA® costs decreased as Celgene assumed the primary development responsibility and has borne a majorityroyalty income from gain on sale of the third-party external costs related to two combination studies: (i) a phase 1b open-label clinical trial of IDHIFA® or ivosidenib in combination with induction and consolidation therapy, and (ii) a phase 1/2 frontline combination clinical trial of either IDHIFA® or ivosidenib in combination with VIDAZA® (azacitidine).
R&D costs reimbursed for IDHIFA® decreased as a result of Celgene assuming the primary development responsibilities. The reimbursements are only representative of third-party costs.
Ivosidenib costs increased as a result of: (i) the two combination studies asoncology business described above (ii)in Other Income and Expense. These were partially offset by the ongoing enrollmentincrease in interest income, net discussed above in Other Income and Expense and the expansion portionincrease in revenue discussed above under Revenues.
Loss from Operations and Net (Loss) Income – 2022 vs 2021 – The $124.7 million decrease in net loss from continuing operations in 2022 compared to 2021 was primarily driven by the gain on sale of the phase 1 clinical trial evaluating single agent ivosidenibcontingent payments in patients with IDH1 mutant-positive advanced hematologic malignancies and (iii) enrollment of the drug-to-drug interaction study. However, the majority of the cost increases are due to us funding 100% of the continued development and commercialization costs, subsequent to the August 15, 2016 termination2022 described above upon which we obtained global developmentin Other Income and commercial rightsExpense, the increase in revenue in 2022 compared to ivosidenib2021 discussed above under Revenues, and the IDH1 program.
R&D costs reimbursed for ivosidenib decreased as a resultincrease in interest income, net and royalty income from gain on sale of our obtaining global developmentoncology business discussed above under Other Income and commercial rights to ivosidenib and the IDH1 program and the responsibility for funding all of the costs related to the program, upon terminating the 2010 Agreement with respect to the program, effective August 15, 2016.

AG-881 costs increased as a result of the ongoing enrollment of two phase 1 multi-center, open-label clinical trials, one in patients with advanced IDH1 or IDH2 mutant-positive solid tumors, including glioma, and the other in patients with advanced IDH1 or IDH2 mutant-positive hematologic malignancies.
As AG-881 development services progressed, the amount recognized as reduction of AG-881Expense. These were partially offset by higher research and development expenses also increased.
AG-348 costs did not materiallydiscussed above under Research and Development Expenses and a decrease in other income, net discussed above under Other Income and Expense. The change as we continued conducting DRIVE PK, a global phase 2, first-in-patient, open-label safetyin net income from discontinued operations and efficacy clinical trialnet (loss) income in adult, transfusion-independent patients with PK deficiency.
AG-519 costs increased due2022 compared to 2021 was primarily driven by the initiationsale of an integrated single ascending dose and multiple ascending dose placebo-controlled phase 1 clinical trial of AG-519our oncology business to Servier for approximately $1.8 billion in healthy volunteerscash in the first quarter of 2016. However, on December 15, 2016, we announced that we will no longer develop AG-519 and withdrew our IND application following a verbal notification of a clinical hold2021, which is included within net income from the FDA.
The increase in the costs of other research and platform programs includes activities related to exploratory efforts, target validation and lead optimization for our discovery and follow-on programs and our proprietary metabolomics platform.
General and administrative expense. The increase in general and administrative expense was primarily attributable an increase of $7.0 million in personnel costs related to an increase in our internal headcount and an increase of $6.6 million in operating expenses, including consulting and facility costs, which includes cost to support our growing commercial organization for the launch of IDHIFA.
Interest Income. The increase in interest income is attributable to higher investment balances driven by upfront fees received under our 2016 Agreement and funds received from our September 2016 follow-on public offering and a more diversified investment portfolio, resulting in higher interest earned on investments.discontinued operations.
Liquidity and Capital Resources
Sources of liquidityLiquidity
Since our inception, and through DecemberMarch 31, 2017,2021, we have fundedfinanced our operations primarily through upfront, milestone, extension, cost reimbursement andproceeds from the sale of our royalty payments related torights, commercial sales of TIBSOVO®, funding received from our collaboration agreements, with Celgene, proceeds received fromprivate placements of our issuance of preferred stock, our IPOinitial public offering of our common stock and follow-on public offerings, and aconcurrent private placement of common stock to an affiliate of Celgene, which was completed concurrentlyand our follow-on public offerings. Following the sale of our oncology business to Servier on March 31, 2021, we have financed and expect to continue to finance our operations primarily through cash on hand, royalty payments from Servier with our IPO.
In April 2017, we completed a public offeringrespect to U.S. net sales of 5,050,505 sharesTIBSOVO® prior to the sale of common stock at an offering price of $49.50 per share. We received netthese contingent payments to Sagard, proceeds from this offeringthe sale of $235.0 million, after deducting underwriting discountscontingent payments to Sagard, a potential milestone payment and commissions paidroyalties from Servier if a new drug application for vorasidenib is approved by us.the FDA with a label that permits vorasidenib’s use as a single agent for the adjuvant treatment of patients with Grade 2 glioma that have an isocitrate dehydrogenase 1 or 2 mutation, the actual and potential future sales of PYRUKYND® and, potentially, collaborations, strategic alliances, licensing arrangements and other nondilutive strategic transactions. In addition, we may pursue opportunistic debt offerings, and equity or equity-linked offerings.
On March 31, 2021, we completed the sale of our oncology business to Servier. The transaction included the sale of our oncology business, including TIBSOVO®, our clinical-stage product candidates vorasidenib, AG-270 and AG-636, and our oncology research programs for a payment of approximately $1.8 billion in cash at the closing, subject to certain adjustments, and a payment of $200.0 million in cash, if, prior to January 1, 2027, vorasidenib is granted NDA approval from the underwritersFDA with an approved label that permits vorasidenib’s use as a single agent for the adjuvant treatment of patients with Grade 2 glioma that have an isocitrate dehydrogenase 1 or 2 mutation (and, to the extent required by such approval, the vorasidenib companion
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diagnostic test is granted an FDA premarket approval), as well as a royalty of 5% of U.S. net sales of TIBSOVO® from the close of the transaction through loss of exclusivity, and a royalty of 15% of U.S. net sales of vorasidenib from the first commercial sale of vorasidenib through loss of exclusivity. The milestone payment for approval of vorasidenib and royalty payments related to vorasidenib and TIBSOVO® represent contingent consideration. Servier also acquired our co-commercialization rights for Bristol Myers Squibb's IDHIFA® and the right to purchase up to an additional 757,575 sharesreceive a $25.0 million potential milestone payment under our prior collaboration agreement with Celgene, and following the sale Servier is responsible for conducting certain clinical development activities within the IDHIFA® development program. As discussed below in Note 1, Nature of common stock, which was exercisedBusiness, in April 2017, resulting in additional net proceeds to us of $35.2 million, after underwriting discounts and commissions. After giving effectOctober 2022, we sold our rights to the full exerciseroyalty on U.S. net sales of the over-allotment option, the number of shares sold by us in the public offering totaled 5,808,080 shares, and net proceedsTIBSOVO® to us totaled $270.2 million, after underwriting discounts and commissions.
In January 2018, we completed a public offering of 7,089,553 shares of common at an offering price of $67.00 per share.Sagard for $131.8 million. We received net proceeds from this offering of $448.9 million, after deducting underwriting discounts and commissions paid by us. In addition, we granted the underwriters the right to purchase up to an additional 1,063,433 shares of common stock, which was exercised in January 2018, resulting in additional net proceeds to us of $67.3 million, after underwriting discounts and commissions. After giving effectretained our rights to the full exercisepotential milestone payment and royalties from Servier if a new drug application for vorasidenib is approved by the FDA. In November 2023, Servier announced that it planned to submit a new drug application for vorasidenib for the treatment of IDH-mutant diffuse glioma to the over-allotment option,FDA by the numberend of shares sold by us2023 and to the European Medicines Agency, or EMA, in the public offering totaled 8,152,986 shares, and net proceeds to us totaled $516.2 million, after underwriting discounts and commissions.early 2024.
In addition to our existingOur cash, cash equivalents and marketable securities we are eligible to earn a significant amount ofbalance was $806.4 million at December 31, 2023. The $200.0 million milestone payments, designation fees, license option fees and extension fees, and we are entitled to cost reimbursementspayment and royalty payments under our collaboration agreements with Celgene. Our ability to earn the milestone payments, cost reimbursements and royalty payments, and the timing of earning these amountsdiscussed above are dependent upon the timing and outcome of our development, regulatory and commercial activities, and is uncertain at this time. Our right to payments under our collaboration agreements with Celgene is our only committed potential external sourcesources of funds.

Whether the regulatory approval milestone for vorasidenib will be achieved is subject to various risks and uncertainties, which are outside our control. Furthermore, we cannot predict what success, if any, Servier may have in the United States with respect to sales of vorasidenib, if approved, and consequently we cannot estimate the amount of royalty payments that we can expect to receive from Servier prior to the loss of exclusivity of vorasidenib.
Cash flowsFlows
The following table provides information regarding our cash flows for the years ended December 31, 2017, 20162023, 2022 and 2015 (in thousands):2021:
(In thousands)202320222021
Net cash used in operating activities$(296,062)$(309,478)$(407,320)
Net cash provided by investing activities239,575 243,261 1,248,778 
Net cash provided by (used in) financing activities5,433 2,350 (765,768)
Net change in cash and cash equivalents$(51,054)$(63,867)$75,690 
 Years Ended December 31,
 2017 2016 2015
Net cash (used in) provided by operating activities$(285,232) $38,562
 $(76,949)
Net cash (used in) provided by investing activities(57,908) (119,350) 128,309
Net cash provided by financing activities285,110
 169,778
 6,373
Net change in cash and cash equivalents$(58,030) $88,990
 $57,733
Net cash (used in) provided byused in operating activities.activities
DuringCash used in operating activities of $296.1 million during the year ended December 31, 2017, we incurred increased2023, of which all was used by continuing operations, was primarily due to operating expenses driven by research and development costs described above under Research and Development Expenses, partially offset by cash received related to increasesinterest income of $31.2 million and cash received from revenues of $28.6 million.
Cash used in clinical study costsoperating activities of $309.5 million during the year ended December 31, 2022, of which all was used by continuing operations, was primarily due to advancementsoperating expenses driven by research and development costs described above under Research and Development Expenses, partially offset by cash received from revenues of $13.3 million, cash received related to interest income of $11.6 million and cash received from royalties on U.S. net sales of TIBSOVO® of $8.6 million.
Cash used in our most advanced product candidates,operating activities of $407.3 million during the year ended December 31, 2021, of which $314.1 million was used by continuing operations and expanded facilities and increased staffing needs$93.2 million was used by discontinued operations, was primarily due to our expanding operations. These amounts wereoperating expenses driven by research and development costs described above in Research and Development Expenses, offset by the receiptcash received of $17.0$39.5 million from sales of TIBSOVO®, and $1.2 million in cost reimbursements related to our collaboration agreements and $3.1 million as reimbursement of tenant improvements under our lease agreement.with Celgene.
During the year ended December 31, 2016, we received a $200.0 million upfront payment related to our 2016 Agreement, $33.2 million in cost reimbursements related to our collaboration agreements, a $25.0 million milestone payment in conjunction with the achievement of a substantive development milestone under the 2010 Agreement, and $4.4 million as reimbursement of tenant improvements under our lease agreement. These amounts were offset by increased operating expenses related to increases in clinical study costs due to advancements in our most advanced product candidates, and expanded facilities and increased staffing needs due to our expanding operations.
During the year ended December 31, 2015, we received $34.7 million in cost reimbursements related to our collaboration agreements, $20.0 million related to Celgene’s December 2014 election to extend the discovery phase of the 2010 Agreement and a $10.0 million upfront payment from our AG-881 Agreements. In addition, we received $3.8 million of refundable income taxes during the year ended December 31, 2015, related to a previously filed carryback claim. These amounts were offset by increased operating expenses related to increases in clinical study costs due to advancements in our most advanced product candidates, and expanded facilities and increased staffing needs due to our expanding operations.
Net cash (used in) provided by investing activities.activities
The cash used inprovided by investing activities for the year ended December 31, 20172023, of which all was provided by continuing operations, was primarily due to higher proceeds from maturities and sales of marketable securities than purchases of marketable securities, partially offset by the $17.5 million up-front payment associated with the Alnylam license agreement discussed above under Overview.
The cash provided by investing activities for the year ended December 31, 2022, of which all was provided by continuing operations, was primarily due to cash received of $131.8 million from the sale of future contingent payments described above in Other Income and Expense and higher proceeds from maturities and sales of marketable securities than purchases of marketable securities.
The cash provided by investing activities for the year ended December 31, 2021, of which $1,802.9 million was provided by discontinued operations and $554.2 million was used by continuing operations was primarily due to the approximately $1.8
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billion in cash proceeds received from the sale of our oncology business to Servier that was completed on March 31, 2021, and the result of higher purchases of marketable securities than proceeds from maturities and sales of marketable securities, in addition to $4.6 million for purchases of property and equipment.securities.
The cash used in investing activities for the year ended December 31, 2016 was primarily the result of higher purchases of marketable securities than proceeds from maturities and sales of marketable securities, in addition to $9.9 million for purchases of property and equipment.
The cash provided by investing activities for the year ended December 31, 2015 was primarily the result of higher proceeds from maturities and sales of marketable securities than purchases of marketable securities, offset by $20.2 million in purchases of property and equipment.
Net cash provided by financing activities. The cash provided by(used in) financing activities for the year ended December 31, 2017 was primarily the result of proceeds of $270.2 million from the April 2017 follow-on public offering of our common stock, net of underwriting discounts and commissions, and proceeds of $14.2 million received from stock option exercises and purchases made pursuant to our employee stock purchase plan.
The cash provided by financing activities for the year ended December 31, 20162023 was primarily the resultdue to $5.4 million of proceeds of $162.1 million from the September 2016 follow-on public offering of our common stock, net of underwriting discounts and commissions, and proceeds of $7.8 million received from stock option exercises and purchases made pursuant to our employee stock purchase plan.
The cash provided by financing activities for the year ended December 31, 20152022 was the resultprimarily due to $2.7 million of proceeds received from stock option exercises and purchases made pursuant to our employee stock purchase planplan.
The cash used in financing activities for the year ended December 31, 2021 was primarily the due to the repurchase of $6.6 million.

common stock under our Repurchase Program of $802.5 million, partially offset by $37.3 million of proceeds received from stock option exercises and purchases made pursuant to our employee stock purchase plan.
Funding requirementsRequirements
We expect our expenses to increase in connection with our ongoing activities, particularly as we continue the research, development and clinical trials of, and seek additional marketing approvals for, and commercialize our product candidates.candidates in our portfolio, including as we continue to commercialize PYRUKYND®. If we obtain additional marketing approvalapprovals for PYRUKYND® in other indications or outside of the United States or for any of our other product candidates, we expect to incur significant commercialization expenses related to product sales, marketing, manufacturing and distribution to the extent that such sales, marketing, manufacturing and distribution are not the responsibility of Celgene or other collaborators. Accordingly, we will need to obtain substantial additional funding in connection with our continuing operations.distribution.
We expect that our existing cash, cash equivalents and marketable securities as of December 31, 2017,2023, together with the net proceeds from our January 2018 follow-on public offering, anticipated product and royalty revenue, anticipated interest income anticipated expense reimbursements under our collaboration agreements, but excluding any additional program-specificand the potential vorasidenib milestone payments, will enable us to fund our operating expenses and capital expenditure requirementsexpenditures through several value-creating milestones and at least into 2026. This guidance does not include cash inflows from potential royalties or royalty monetization from vorasidenib, commercializing mitapivat outside of the end of 2020.United States through one or more partnerships, or other potential strategic business or financial agreements. Our future capital requirements will depend on many factors, including:
the amount and timing of future revenue received from commercial sales of PYRUKYND® or any of our product candidates for which we may receive marketing approval;
the amount of contingent consideration we ultimately receive from Servier;
the costs and timing of our ongoing commercialization activities, including product manufacturing, sales, marketing and distribution for PYRUKYND® for the treatment of hemolytic anemia in adults with PK deficiency in approved jurisdictions;
the scope, progress, results and costs of drug discovery, preclinical development, laboratory testing and clinical trials for our product candidates;
the successcosts associated with in-licensing or acquiring assets for pipeline growth, including the amount and timing of our collaborations;future milestone and royalty payments potentially payable to Alnylam pursuant to the license agreement;
the extent to which we acquire or in-license other medicines and technologies;
the costs, timing and outcome of regulatory review of our product candidates;
the costs associated with preparation for the potential commercial launch for one or more of our product candidates;
the costs of preparing, filing and prosecuting patent applications, maintaining and enforcing our intellectual property rights and defending intellectual property-related claims;
the costs and timing of future commercialization activities, including product manufacturing, sales, marketing and distribution, for any of our product candidates for which we may receive marketing approval;
our ability to establish and maintain additional collaborations on favorable terms, if at all.all;
our ability to successfully execute on our strategic plans;
operational delays due to public health epidemics, including the recent COVID-19 pandemic; and
operational delays, disruptions and/or increased costs associated with global economic developments, rising global energy prices or energy shortages or rationing.
Until such time, if ever, as we can generate substantial product revenue, we expect to finance our cash needs primarily through a combinationcash on hand, the potential milestone payment and royalties from Servier if vorasidenib is approved by the FDA, the actual and potential future sales of equity offerings, debt financings,PYRUKYND® and, potentially, collaborations, strategic alliances, licensing arrangements and licensing arrangements.other nondilutive strategic transactions. In addition, we may pursue opportunistic debt offerings, and equity or equity-linked offerings. We do not have any committed external source of funds other than the potential milestone and royalty payments that we are eligible to receive with respect to vorasidenib under our collaborations.purchase agreement with Servier. To the extent that we raise additional capital through the sale of equity or convertible debt securities, the ownership interest of our stockholders will be diluted, and the terms of these securities may include liquidation or other preferences that adversely affect the rights of our common stockholders. Debt financing, if available, may involve agreements that include covenants limiting or restricting our
80

ability to take specific actions, such as incurring additional debt, selling or licensing our assets, making capital expenditures or declaring dividends.
If we raise funds through additional collaborations, strategic alliances or licensing arrangements with third parties, we may have to relinquish valuable rights to our technologies, future revenue streams, research programs or product candidates, or grant licenses on terms that may not be favorable to us. If we are unable to raise additional funds through equity or debt financings when needed or on attractive terms, we may be required to delay, limit, reduce or terminate our product development or future commercialization efforts, or grant rights to develop and market product candidates that we would otherwise prefer to develop and market ourselves.
Off-Balance Sheet Arrangements
We did not have, during the periods presented, and we do not currently have, any off-balance sheet arrangements, as defined under applicable Securities and Exchange CommissionSEC rules.
Contractual Obligations
The following table summarizes our significant contractual obligations as of the payment due date by period at December 31, 2017 (in thousands):
2023:
Payments due by period
(In thousands)TotalLess
than
1 year
1-3
years
3-5
years
More
than
5 years
Operating lease obligations (1)$81,033 $17,142 $39,657 $24,234 $— 
Manufacturing arrangements (2)637 318 319 — — 
Service arrangements (3)8,143 1,629 3,257 3,257 — 
 Payments due by period
 Total Less
than
1 year
 1-3
years
 3-5
years
 More
than
5 years
Operating lease obligations(1)$95,872
 $11,295
 $23,847
 $26,839
 $33,891
(1) Relates to payment obligations under lease agreements covering approximately 146,000 square feet at 88 Sidney Street, 43,000 square feet at 64 Sidney Street, and 13,000 square feet at 38 Sidney Street, Cambridge, Massachusetts. All leases, as amended, expire on February 29, 2028. At the end of the initial lease period, we have the option to extend the leases at all facilities for two consecutive five-year periods at the fair market rent at the time of the extension.
(1)Represents future minimum lease payments under our non-cancelable operating leases. The minimum lease payments above do not include any related common area maintenance charges or real estate taxes.

(2) Relates to payment obligations under a packaging and supply agreement for drug product.
(3) Relates to payment obligations under a development and manufacturing services agreement for drug product. Arrangement is for a contractual term of five years, however, the total funds can be allocated in any manner to meet the agreement terms. Amounts included assume equal payments each year.
We also enter into agreements in the normal course of business with CROs for clinical trials and clinicalcontract manufacturing organizations, or CMOs, for supply manufacturing and with vendors for preclinical research studies and other services and products for operating purposes. These contracts generally provide for termination on notice, and thereforecontractual obligations are cancelable contractsat any time by us, generally upon prior written notice to the vendor, and are thus not included in the table of contractual obligations table.
In July 2023, we entered into a license agreement with Alnylam as discussed above under Overview and commitments.under Note 1, Nature of Business, to our consolidated financial statements. Under the license agreement, we may be required to pay up to $130.0 million in potential development and regulatory milestones, in addition to sales milestones as well as tiered royalties on annual net sales, if any, of licensed products, which may be subject to specified reductions and offsets. Such payment obligations are contingent upon the occurrence of future events and the timing and likelihood of such potential obligations are not known.
Item 7A. Quantitative and Qualitative Disclosures about Market Risk
We are exposed to market risk related to changes in interest rates. As of December 31, 2017,2023 and December 31, 2022, we had cash, cash equivalents and marketable securities of $567.8$806.4 million and $1.1 billion, respectively, consisting primarily of investments in U.S. Treasuries, certificates of deposit, and government securities and corporate debt securities. Our primary exposure to market risk is interest rate sensitivity, which is affected by changes in the general level of U.S. interest rates, particularly because our investments are primarily in short-term marketable securities. Our marketable securities are subject to interest rate risk and could fall in value if market interest rates increase. Due to the short-term duration of our investment portfolio and the low risk profile of our investments, we do not believe an immediate 10%and uniform 100 basis point change in interest rates would have a material effect on the fair market value of our investment portfolio. We have the ability to hold our marketable securities until maturity, and therefore we would not expect our operating results or cash flows to be affected to any significant degree by the effect of a change in market interest rates on our investments.
We are also exposed to market risk related to changes in foreign currency exchange rates. We have contracts with CROs and CMOs that are located in Asia and Europe thatand are denominated in foreign currencies. We are subject to fluctuations in foreign currency rates in connection with these agreements. We do not currently hedge our foreign currency exchange rate risk. As of December 31, 20172023 and December 31, 2016,2022, we had minimal or no liabilities denominated in foreign currencies.
81

Item 8. Financial Statements and Supplementary Data
The financial statements required to be filed pursuant to this Item 8 are appended to this report.Annual Report on Form 10-K. An index of those financial statements is found in Item 15,, Exhibits and Financial Statement Schedules, of this Annual Report on Form 10-K.
Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure
On May 1, 2017, the Audit Committee of the Board of Directors approved the dismissal of Ernst & Young LLP (“E&Y”) as our independent registered public accounting firm, effective May 5, 2017, and approved the engagement of PricewaterhouseCoopers LLP as the independent registered public accounting firm for the fiscal year ending December 31, 2017.None.
The reports of E&Y on our consolidated financial statements for the fiscal years ended December 31, 2016 and 2015 did not contain an adverse opinion or disclaimer of opinion, nor were they qualified or modified as to uncertainty, audit scope, or accounting principles. During the fiscal years ended December 31, 2016 and 2015, and the subsequent interim period through May 5, 2017 there were no disagreements (as defined in Item 304(a)(1)(iv) of Regulation S-K and the related instructions) with E&Y on any matter of accounting principles or practices, financial statement disclosure, or auditing scope or procedures, which disagreement if not resolved to the satisfaction of E&Y would have caused E&Y to make reference thereto in its reports.

Item 9A. Controls and Procedures
Evaluation of Disclosure Controls and Procedures
Our management, with the participation of our principal executive officer and our principal financial officer, evaluated, as of the end of the period covered by this Annual Report on Form 10-K, the effectiveness of our disclosure controls and procedures. Based on that evaluation of our disclosure controls and procedures as of December 31, 2017,2023, our principal executive officer and principal financial officer concluded that our disclosure controls and procedures as of such date are effective at the reasonable assurance level. The term “disclosure controls and procedures,” as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act, means controls and other procedures of a company that are designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act are recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by us in the reports we file or submit under the Exchange Act is accumulated and communicated to our management, including our principal executive officer and principal financial officer, as appropriate to allow timely decisions regarding required disclosure. Management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives and our management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures.
Management’s Annual Report on Internal Control over Financial Reporting
Our management is responsible for establishing and maintaining adequate internal control over our financial reporting. Internal control over financial reporting is defined in Rules 13a-15(f) and 15d-15(f) promulgated under the Exchange Act as a process designed by, or under the supervision of, our principal executive and principal financial officers and effected by our board of directors, management and other personnel to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with U.S. GAAP. Our internal control over financial reporting includes those policies and procedures that:
pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect our transactions and dispositions of our assets;
provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with U.S. GAAP, and that our receipts and expenditures are being made only in accordance with authorizations of our management and directors; and
provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of our assets that could have a material effect on our financial statements.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
Our management assessed the effectiveness of our internal control over financial reporting as of December 31, 2017.2023. In making this assessment, management used the criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in its 2013 Internal Control – Integrated Framework. Based on our assessment, our management has concluded that, as of December 31, 2017,2023, our internal control over financial reporting is effective based on those criteria.
The effectiveness of our internal control over financial reporting as of December 31, 2017,2023, has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report, which is included herein.
82

Changes in Internal Control over Financial Reporting
There were no changes in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the fiscal quarter ended December 31, 20172023 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.
Item 9B. Other Information
None.(b) Director and Officer Trading Arrangements

None of our directors or officers adopted or terminated a Rule 10b5-1 trading arrangement or a non-Rule 10b5-1 trading arrangement (as defined in Item 408(c) of Regulation S-K) during the three months ended December 31, 2023.
Item 9C. Disclosure Regarding Foreign Jurisdictions that Prevent Inspections

Not applicable.
83

PART III
Item 10. Directors, Executive Officers and Corporate Governance
The information required by this Item 10 will be included in our definitive proxy statement to be filed with the Securities and Exchange Commission, or SEC, with respect to our 20182024 Annual Meeting of Stockholders and is incorporated herein by reference.
Item 11. Executive Compensation
The information required by this Item 11 will be included in our definitive proxy statement to be filed with the SEC with respect to our 20182024 Annual Meeting of Stockholders and, other than the information required by Item 402(v) of Regulation S-K, is incorporated herein by reference.
Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters
The information required by this Item 12 will be included in our definitive proxy statement to be filed with the SEC with respect to our 20182024 Annual Meeting of Stockholders and is incorporated herein by reference.
Item 13. Certain Relationships and Related Transactions, and Director Independence
The information required by this Item 13 will be included in our definitive proxy statement to be filed with the SEC with respect to our 20182024 Annual Meeting of Stockholders and is incorporated herein by reference.
Item 14. Principal AccountingAccountant Fees and Services
The information required by this Item 14 will be included in our definitive proxy statement to be filed with the SEC with respect to our 20182024 Annual Meeting of Stockholders and is incorporated herein by reference.

84

PART IV
Item 15. Exhibits and Financial Statement Schedules
(1)   Financial Statements
The following documents are included on pages F-1 through F-32F-29 attached hereto and are filed as part of this Annual Report on Form 10-K.

(2)   Financial Statement Schedules
Schedules have been omitted since they are either not required or not applicable or the information is otherwise included herein.
(3)   Exhibits
85

Exhibit
  Number  
 Description of Exhibit Incorporated by Reference 
Filed
Herewith
Form 
File
Number  
 Date of Filing Exhibit
Number
 
3.1  8-K 001-36014 July 30, 2013 3.1
  
3.2  8-K 001-36014 July 30, 2013 3.2
  
4.1  S-1 333-189216 June 24, 2013 4.1
  
4.2  S-1 333-189216 June 10, 2013 4.2
  
10.1#  S-1 333-189216 June 10, 2013 10.1
  
10.2#  S-1 333-189216 June 10, 2013 10.2
  
10.3#  S-1 333-189216 June 10, 2013 10.3
  
10.4#  S-1 333-189216 June 24, 2013 10.4
  
10.5#  S-1 333-189216 June 24, 2013 10.5
  
10.6#  S-1 333-189216 June 24, 2013 10.6
  
10.7#  S-1 333-189216 June 24, 2013 10.7
  
10.8#  S-1 333-189216 July 11, 2013 10.9
  
10.9#  S-1 333-189216 July 11, 2013 10.10
  


10.68-K001-36014September 19, 201410.1
10.78-K001-36014November 26, 201410.1
10.8#10-Q001-36014May 11, 201510.1
10.98-K001-36014July 23, 201510.1
10.10#10-K001-36014February 26, 201610.25
10.118-K001-36014November 22, 201710.1
10.128-K001-36014November 22, 201710.2
10.138-K001-36014April 13, 201810.1
10.14#10-Q001-36014May 4, 201810.1
10.15#10-K001-36014February 14, 201910.32
10.1610-Q001-36014August 1, 201910.1
10.1710-Q001-36014August 1, 201910.2
10.1810-Q001-36014August 1, 201910.3
10.1910-Q001-36014November 3, 202110.2
10.2010-K001-36014February 24, 202210.44
10.21X
10.22#10-Q001-36014August 4, 202210.2
10.23#10-Q001-36014August 4, 202210.3
10.24#10-Q001-36014August 4, 202210.4
86

Exhibit
  Number  
 Description of Exhibit Incorporated by Reference 
Filed
Herewith
Form 
File
Number  
 Date of Filing Exhibit
Number
 
10.10  S-1 333-189216 July 11, 2013 10.12
  
10.11#  10-K 001-36014 February 26, 2016 10.13
  
10.12†  S-1 333-189216 July 16, 2013 10.14
  
10.13†  10-K 001-36014 February 24, 2015 10.15
  
10.14  S-1 333-189216 July 16, 2013 10.15
  
10.15  8-K 001-36014 September 19, 2014 10.1
  
10.16  8-K 001-36014 November 26, 2014 10.1
  
10.17#  10-Q 001-36014 May 11, 2015 10.1
  
10.18  8-K 001-36014 July 23, 2015 10.1
  
10.19†  10-Q 001-36014 August 7, 2015 10.1
  
10.20†  10-Q 001-36014 August 7, 2015 10.2
  
10.21#  10-K 001-36014 February 26, 2016 10.25
  
10.22#  8-K 001-36014 April 22, 2016 10.21
  
10.23#  10-Q 001-36014 May 9, 2016 10.1
  
10.24†  10-Q 001-36014 August 8, 2016 10.1
  
10.25#  8-K 001-36014 August 16, 2016 99.2
  
10.26  8-K 001-36014 November 22, 2017 10.1
  


10.25#**10-Q001-36014August 4, 202210.5
10.26#10-Q001-36014November 3, 202210.5
10.27#S-8333- 267624September 26, 202299.1
10.28#S-8333- 267624September 26, 202299.2
10.29#**S-8333- 267624September 26, 202299.3
10.30#8-K001-36014October 7, 202210.1
10.31#10-K001-36014February 23, 202310.38
10.32#S-8333- 269018January 3, 202399.1
10.33#S-8333- 269108January 3, 202399.2
10.34#**S-8333- 269108January 3, 202399.3
10.35#S-8333-272615June 13, 202399.1
10.36#10-Q001-36014August 3, 202310.2
10.37#10-Q001-36014August 3, 202310.3
10.38#10-Q001-36014August 3, 202310.4
21.1X
23.1X
31.1X
31.2X
32.1*X
32.2*X
97.1X
87

Exhibit
  Number  
 Description of Exhibit Incorporated by Reference 
Filed
Herewith
Form 
File
Number  
 Date of Filing Exhibit
Number
 
10.27  8-K 001-36014 November 22, 2017 10.2
  
21.1          X
23.1           
23.2          X
31.1          X
31.2          X
32.1*          X
32.2*          X
101.INS XBRL Instance Document         X
101.SCH XBRL Taxonomy Extension Schema Document         X
101.CAL XBRL Taxonomy Calculation Linkbase Document         X
101.DEF XBRL Taxonomy Extension Definition Linkbase Document         X
101.LAB XBRL Taxonomy Label Linkbase Document         X
101.PRE XBRL Taxonomy Presentation Linkbase Document         X
             
# Indicates management contract or compensatory plan or arrangement.
 Confidential treatment has been granted as to certain portions, which portions have been omitted and filed separately with the Securities and Exchange Commission.
* This certification will not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or the Exchange Act, or otherwise subject to the liability of that section. Such certification will not be deemed to be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except to the extent specifically incorporated by reference into such filing.
101.INSXBRL Instance DocumentX
101.SCHXBRL Taxonomy Extension Schema DocumentX
101.CALXBRL Taxonomy Calculation Linkbase DocumentX
101.DEFXBRL Taxonomy Extension Definition Linkbase DocumentX
101.LABXBRL Taxonomy Label Linkbase DocumentX
101.PREXBRL Taxonomy Presentation Linkbase DocumentX
104Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)X
#Indicates management contract or compensatory plan or arrangement.
*This certification will not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or the Exchange Act, or otherwise subject to the liability of that section. Such certification will not be deemed to be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Exchange Act, except to the extent specifically incorporated by reference into such filing.
**Portions of this exhibit have been omitted pursuant to Item 601(b)(10)(iv) of Regulation S-K.
Item 16. Form 10-K Summary
None.

88

SIGNATURES
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.
AGIOS PHARMACEUTICALS, INC.
February 15, 2024By:/s/ Brian Goff
February 14, 2018By:/s/ David P. Schenkein
David P. Schenkein, M.DBrian Goff
President and Chief Executive Officer
Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.
SignatureTitleDate
SignatureTitleDate
/s/ David P. SchenkeinBrian Goff
President, Chief Executive Officer
and Director
(Principal executive officer)
February 14, 201815, 2024
David P. Schenkein, M.D.

Brian Goff
/s/ Andrew HirschCecilia Jones
Chief Financial Officer
(Principal financial officer)
February 14, 201815, 2024
Andrew Hirsch

Cecilia Jones
/s/ Carman AlensonT.J. Washburn
Vice President, of Accounting, Treasury and TaxController
(Principal accounting officer)
February 14, 201815, 2024
Carman AlensonT.J. Washburn


/s/ Paul J. ClancyJacqualyn A. FouseDirectorChair of the Board of DirectorsFebruary 14, 201815, 2024
Jacqualyn A. Fouse, Ph.D.
/s/ Rahul BallalDirectorFebruary 15, 2024
Paul J. ClancyRahul Ballal, Ph.D.


/s/ Ian ClarkJeffrey CapelloDirectorFebruary 14, 201815, 2024
Ian Clark

Jeffrey Capello
/s/ Kaye FosterDirectorFebruary 14, 201815, 2024
Kaye Foster


/s/ Jacqualyn FouseDirectorFebruary 14, 2018
Jacqualyn Fouse, Ph.D.
/s/ Maykin HoDirectorFebruary 14, 201815, 2024
Maykin Ho, Ph.D.


/s/ John M. MaraganoreCatherine OwenDirectorFebruary 14, 201815, 2024
John M. Maraganore, Ph.D.

Catherine Owen
/s/ David ScaddenDirectorFebruary 14, 201815, 2024
David Scadden, M.D.
/s/ David P. SchenkeinDirectorFebruary 15, 2024
David P. Schenkein, M.D.

/s/ Cynthia SmithDirectorFebruary 15, 2024
Cynthia Smith

89


Agios Pharmaceuticals, Inc.
Index to Consolidated Financial Statements



F-1

Report of Independent Registered Public Accounting Firm
TheTo the Board of Directors and Stockholders of Agios Pharmaceuticals, Inc.
Opinions on the Financial Statements and Internal Control over Financial Reporting
We have audited the accompanying consolidated balance sheetsheets of Agios Pharmaceuticals, Inc. and its subsidiaries (the “Company”) as of December 31, 2017,2023 and 2022, and the related consolidated statements of operations, of comprehensive loss,(loss) income, of stockholders’ equity and of cash flows for each of the year thenthree years in the period ended December 31, 2023, including the related notes (collectively referred to as the “consolidated financial statements”).We also have audited the Company's internal control over financial reporting as of December 31, 2017,2023, based on criteria established in Internal Control - Integrated Framework(2013)issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).
In our opinion, the consolidatedfinancial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2017, 2023 and 2022, and the results of their itsoperations and their itscash flows for each of the year thenthree years in the period ended December 31, 2023 in conformity with accounting principles generally accepted in the United States of America. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2017,2023, based on criteria established in Internal Control - Integrated Framework(2013)issued by the COSO.
Basis for Opinions
The Company's management is responsible for these consolidated financial statements, for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting, included in Management’sManagement's Annual Report on Internal Control over Financial Reporting appearing under Item 9A. Our responsibility is to express opinions on the Company’s consolidatedfinancial statements and on the Company's internal control over financial reporting based on our audit.audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) ("PCAOB")(PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our auditaudits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the auditaudits to obtain reasonable assurance about whether the consolidatedfinancial statements are free of material misstatement, whether due to error or fraud, and whether effective internal control over financial reporting was maintained in all material respects.
Our auditaudits of the consolidatedfinancial statements included performing procedures to assess the risks of material misstatement of the consolidatedfinancial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidatedfinancial statements. Our auditaudits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our auditaudits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audit providesaudits provide a reasonable basis for our opinions.
Definition and Limitations of Internal Control over Financial Reporting
A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.
Critical Audit Matters
The critical audit matter communicated below is a matter arising from the current period audit of the consolidated financial statements that was communicated or required to be communicated to the audit committee and that (i) relates to accounts or
F-2

disclosures that are material to the consolidated financial statements and (ii) involved our especially challenging, subjective, or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosures to which it relates.
Revenue Recognition - PYRUKYND® Product Revenue
As described in Notes 2 and 8 to the consolidated financial statements, the Company generates product revenue from sales of PYRUKYND® to a limited number of specialty distributors and specialty pharmacy providers, or collectively, the Customers. These Customers subsequently resell PYRUKYND® to pharmacies or dispense directly to patients. The performance obligation related to the sale of PYRUKYND® is satisfied and revenue is recognized when the Customer obtains control of the product, which occurs at a point in time, typically upon delivery to the Customer. Revenues from product sales are recorded at the net sales price, or transaction price, which includes estimates of variable consideration for which reserves are established and result from contractual adjustments, government rebates, returns and other allowances that are offered within the contracts with the Customers, healthcare providers, payors and other indirect customers relating to the sale of its products. For the year ended December 31, 2023, the Company recognized $26.8 million of net product revenue relating to the sale of PYRUKYND®.
The principal consideration for our determination that performing procedures relating to PYRUKYND® product revenue recognition is a critical audit matter is a high degree of auditor effort in performing procedures related to the Company’s product revenue recognition.
Addressing the matter involved performing procedures and evaluating audit evidence in connection with forming our overall opinion on the consolidated financial statements. These procedures included testing the effectiveness of controls relating to the revenue recognition process, including controls over the recording of PYRUKYND® product revenue at the transaction price once control passes to the customer. These procedures also included, among others, (i) evaluating management’s revenue recognition policy and (ii) testing the completeness, accuracy, and occurrence of revenue recognized for a sample of product revenue transactions by obtaining and inspecting source documents, such as purchase orders, invoices, proof of delivery, and subsequent cash receipts.

/s/ PricewaterhouseCoopers LLP
Boston, Massachusetts
February 14, 201815, 2024

We have served as the Company’s auditor since 2017.

F-3
Report

The Board of Directors and Stockholders
Agios Pharmaceuticals, Inc.
We have audited the accompanying consolidated balance sheets of Agios Pharmaceuticals, Inc. as of December 31, 2016, and the related consolidated statements of operations, comprehensive loss, stockholders’ equity, and cash flows for each of the two years in the period ended December 31, 2016. These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these financial statements based on our audits.
We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.
In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated financial position of Agios Pharmaceuticals, Inc. at December 31, 2016, and the consolidated results of their operations and their cash flows for each of the two years in the period ended December 31, 2016, in conformity with U.S. generally accepted accounting principles.
/s/ Ernst & Young LLP
Boston, Massachusetts
February 16, 2017



Agios Pharmaceuticals, Inc.
Consolidated Balance Sheets
(In thousands, except share and per share data)
 December 31,
 2017 2016
Assets   
Current assets:   
Cash and cash equivalents102,724
 160,754
Marketable securities321,212
 380,560
Collaboration receivable – related party2,448
 4,886
Royalty receivable – related party1,222
 
Tenant improvement and other receivables169
 3,428
Prepaid expenses and other current assets17,486
 10,264
Total current assets445,261
 559,892
Marketable securities143,814
 32,250
Property and equipment, net24,431
 25,337
Other non-current assets891
 1,615
Total assets614,397
 619,094
Liabilities and stockholders’ equity   
Current liabilities:   
Accounts payable22,767
 17,106
Accrued expenses34,031
 32,002
Deferred revenue – related party37,842
 35,913
Deferred rent301
 3,412
Total current liabilities94,941
 88,433
Deferred revenue, net of current portion – related party125,798
 154,297
Deferred rent, net of current portion18,155
 17,773
Total liabilities238,894
 260,503
Commitments and contingent liabilities (Note 7)

 
Stockholders’ equity:   
Preferred stock, $0.001 par value; 25,000,000 shares authorized, no shares issued and outstanding at December 31, 2017 and 2016
 
Common stock, $0.001 par value; 125,000,000 shares authorized and 48,826,153 and 42,220,444 shares issued and outstanding at December 31, 2017 and 2016, respectively49
 42
Additional paid-in capital1,174,904
 842,013
Accumulated other comprehensive loss(1,389) (313)
Accumulated deficit(798,061) (483,151)
Total stockholders’ equity375,503
 358,591
Total liabilities and stockholders’ equity614,397
 619,094
(In thousands, except share and per share data) December 31:20232022
Assets
Current assets:
Cash and cash equivalents$88,205 $139,259 
Marketable securities688,723 643,860 
Accounts receivable, net2,810 2,206 
Inventory19,076 8,492 
Prepaid expenses and other current assets35,021 38,955 
Total current assets833,835 832,772 
Marketable securities29,435 313,874 
Operating lease assets54,409 65,129 
Property and equipment, net15,382 22,987 
Other non-current assets4,057 3,956 
Total assets$937,118 $1,238,718 
Liabilities and stockholders’ equity
Current liabilities:
Accounts payable$9,780 $18,616 
Accrued expenses43,167 30,350 
Operating lease liabilities15,008 13,663 
Total current liabilities67,955 62,629 
Operating lease liabilities, net of current portion56,988 71,996 
Other non-current liabilities1,156 3,279 
Total liabilities126,099 137,904 
Commitments and contingent liabilities (Note 16)
Stockholders’ equity:
Preferred stock, $0.001 par value; 25,000,000 shares authorized, no shares issued and outstanding at December 31, 2023 and 2022— — 
Common stock, $0.001 par value; 125,000,000 shares authorized; 72,161,489 shares issued and 55,945,078 outstanding at December 31, 2023 and 71,256,118 shares issued and 55,039,707 outstanding at December 31, 202272 71 
Additional paid-in capital2,436,523 2,386,325 
Accumulated other comprehensive loss(441)(12,535)
Accumulated deficit(822,649)(470,561)
Treasury stock, at cost (16,216,411 shares at December 31, 2023 and December 31, 2022)(802,486)(802,486)
Total stockholders’ equity811,019 1,100,814 
Total liabilities and stockholders’ equity$937,118 $1,238,718 
See accompanying Notes to Consolidated Financial Statements.

F-4


Agios Pharmaceuticals, Inc.
Consolidated Statements of Operations
(in thousands, except share and per share data)
(In thousands, except share and per share data) Years Ended December 31:202320222021
Revenues:
Product revenue, net$26,823 $11,740 $— 
Milestone revenue— 2,500 — 
Total revenue26,823 14,240 — 
Operating expenses
Cost of sales$2,881 $1,704 $— 
Research and development295,526 279,910 256,973 
Selling, general and administrative119,903 121,673 121,445 
Total operating expenses418,310 403,287 378,418 
Loss from operations(391,487)(389,047)(378,418)
Gain on sale of contingent payments— 127,853 — 
Royalty income from gain on sale of oncology business— 9,851 6,639 
Interest income, net33,344 12,793 836 
Other income, net6,055 6,749 14,433 
Net loss from continuing operations(352,088)(231,801)(356,510)
Net income from discontinued operations, net of tax— — 1,961,225 
Net (loss) income$(352,088)$(231,801)$1,604,715 
Net loss from continuing operations per share - basic and diluted$(6.33)$(4.23)$(5.90)
Net income from discontinued operations per share - basic and diluted$— $— $32.45 
Net (loss) income per share - basic and diluted$(6.33)$(4.23)$26.55 
Weighted-average number of common shares used in computing net loss per share from continuing operations, net income per share from discontinued operations and net (loss) income per share – basic and diluted55,651,487 54,789,435 60,447,346 
See accompanying Notes to Consolidated Financial Statements.

F-5
 Years Ended December 31,
 2017 2016 2015
Collaboration revenue – related party$41,074
 $69,892
 $59,119
Royalty revenue – related party1,937
 
 
Total revenue43,011
 69,892
 59,119
Operating expenses:     
Research and development (net of $7,811, $19,714 and $25,173 of cost reimbursement from related party for the years ended December 31, 2017, 2016 and 2015, respectively)292,681
 220,163
 141,827
General and administrative71,124
 50,714
 35,992
Total operating expenses363,805
 270,877
 177,819
Loss from operations(320,794) (200,985) (118,700)
Interest income6,124
 2,514
 968
Net loss$(314,670) $(198,471) $(117,732)
Net loss per share – basic and diluted(6.75) (5.07) (3.15)
Weighted-average number of common shares used in computing net loss per share – basic and diluted46,587,631
 39,126,400
 37,429,262

Agios Pharmaceuticals, Inc.
Consolidated Statements of Comprehensive (Loss) Income

(In thousands) Years Ended December 31:202320222021
Net (loss) income$(352,088)$(231,801)$1,604,715 
Other comprehensive (loss) income
Unrealized gain (loss) on available-for-sale securities12,094 (11,337)(1,303)
Comprehensive (loss) income$(339,994)$(243,138)$1,603,412 
See accompanying Notes to Consolidated Financial Statements.


Agios Pharmaceuticals, Inc.
Consolidated Statements of Comprehensive Loss
(in thousands)

F-6
 Years Ended December 31,
 2017 2016 2015
Net loss$(314,670) $(198,471) $(117,732)
Other comprehensive (loss) income:     
Unrealized (loss) gain on available-for-sale securities(1,076) 5
 (261)
Comprehensive loss$(315,746) $(198,466) $(117,993)

See accompanying Notes to Consolidated Financial Statements.


Agios Pharmaceuticals, Inc.
Consolidated Statements of Stockholders’ Equity
(in thousands, except share amounts)
 
 
Common Stock
 
Additional
Paid-In
Capital
 
Accumulated
Other
Comprehensive
Income (Loss)
 
Accumulated
Deficit
 
Total
Stockholders’
(Deficit)
Equity
 Shares Amount 
Balance at December 31, 201437,100,513
 $37
 $591,334
 $(57) $(166,948) $424,366
Unrealized loss on available-for-sale securities
 
 
 (261) 
 (261)
Net loss
 
 
 
 (117,732) (117,732)
Stock-based compensation expense
 
 31,574
 
 
 31,574
Vesting of restricted stock8,522
 
 6
 
 
 6
Issuance of common stock under stock incentive and employee stock purchase plans587,467
 1
 7,135
 
 
 7,136
Issuance of common stock for follow-on offering
 
 29
 
 
 29
Balance at December 31, 201537,696,502
 $38
 $630,078
 $(318) $(284,680) $345,118
Unrealized gain on available-for-sale securities
 
 
 5
 
 5
Net loss
 
 
 
 (198,471) (198,471)
Stock-based compensation expense
 
 42,086
 
 
 42,086
Issuance of common stock under stock incentive and employee stock purchase plans647,539
 
 7,703
 
 
 7,703
Issuance of common stock for follow-on offering3,876,403
 4
 162,146
 
 
 162,150
Balance at December 31, 201642,220,444
 $42
 $842,013
 $(313) $(483,151) $358,591
Unrealized loss on available-for-sale securities
 
 
 (1,076) 
 (1,076)
Net loss
 
 
 
 (314,670) (314,670)
Stock-based compensation expense
 
 47,809
 
 
 47,809
Issuance of common stock under stock incentive and employee stock purchase plans797,629
 1
 14,189
 
 
 14,190
Issuance of common stock for follow-on offering5,808,080
 6
 270,244
 
 
 270,250
Other
 
 649
 
 (240) 409
Balance at December 31, 201748,826,153
 $49
 $1,174,904
 $(1,389) $(798,061) $375,503
 
Common Stock
Additional
Paid-In
Capital
Accumulated
Other
Comprehensive
Income (Loss)
Accumulated
Deficit
TreasuryTotal
Stockholders’
Equity
(In thousands, except share amounts)SharesAmountSharesAmount
Balance at December 31, 202069,293,920 $69 $2,242,801 $105 $(1,843,475)— $— $399,500 
Unrealized loss on available-for-sale securities— — — (1,303)— — — (1,303)
Net income— — — — 1,604,715 — — 1,604,715 
Stock-based compensation expense— — 53,508 — — — — 53,508 
Common stock issued under stock incentive plan and ESPP1,256,711 37,294 — — — — 37,296 
Repurchase of common stock— — — — — (16,216,411)(802,486)(802,486)
Disposition of oncology business— — 745 — — — — 745 
Balance at December 31, 202170,550,631 $71 $2,334,348 $(1,198)$(238,760)(16,216,411)$(802,486)$1,291,975 
Unrealized loss on available-for-sale securities— — — (11,337)— — — (11,337)
Net loss— — — — (231,801)— — (231,801)
Stock-based compensation expense— — 49,296 — — — — 49,296 
Common stock issued under stock incentive plan and ESPP705,487 — 2,681 — — — — 2,681 
Balance at December 31, 202271,256,118 $71 $2,386,325 $(12,535)$(470,561)(16,216,411)$(802,486)$1,100,814 
Unrealized gain on available-for-sale securities— — — 12,094 — — — 12,094 
Net loss— — — — (352,088)— — (352,088)
Stock-based compensation expense— — 44,766 — — — — 44,766 
Common stock issued under stock incentive plan and ESPP905,371 5,432 — — — — 5,433 
Balance at December 31, 202372,161,489 $72 $2,436,523 $(441)$(822,649)(16,216,411)$(802,486)$811,019 
See accompanying Notes to Consolidated Financial Statements.



F-7

Agios Pharmaceuticals, Inc.
Consolidated Statements of Cash Flows
(in thousands)
 Years Ended December 31,
 2017 2016 2015
Operating activities     
Net loss$(314,670) $(198,471) $(117,732)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:     
Depreciation6,432
 5,708
 3,342
Loss on disposal of property and equipment40
 
 33
Stock-based compensation expense47,809
 42,086
 31,963
Net (accretion of discount) amortization of premium on marketable securities(11) 773
 539
Changes in operating assets and liabilities:     
Collaboration receivable – related party2,438
 3,339
 (1,733)
Royalty receivable – related party(1,222) 
 
Tenant improvement and other receivables2,930
 275
 (1,040)
Prepaid expenses and other current and non-current assets(6,530) (2,695) (3,768)
Accounts payable5,329
 3,501
 4,215
Accrued expenses1,522
 16,854
 1,633
Deferred revenue – related party(26,570) 165,846
 (14,047)
Deferred rent(2,729) 1,346
 15,805
Refundable income taxes and income taxes payable
 
 3,841
Net cash (used in) provided by operating activities(285,232) 38,562
 (76,949)
Investing activities     
Purchases of marketable securities(688,702) (506,067) (353,177)
Proceeds from maturities and sales of marketable securities635,421
 396,632
 501,650
Purchases of property and equipment(4,627) (9,915) (20,164)
Net cash (used in) provided by investing activities(57,908) (119,350) 128,309
Financing activities     
Proceeds from public offering of common stock, net of commissions270,250
 162,150
 
Reimbursement (payment) of public offering costs638
 (230) (207)
Net proceeds from stock option exercises and employee stock purchase plan, and vesting of restricted stock units14,222
 7,858
 6,580
Net cash provided by financing activities285,110
 169,778
 6,373
Net change in cash and cash equivalents(58,030) 88,990
 57,733
Cash and cash equivalents at beginning of the period160,754
 71,764
 14,031
Cash and cash equivalents at end of the period$102,724
 $160,754
 $71,764
Supplemental disclosure of non-cash investing and financing transactions:     
Vesting of restricted stock$
 $
 $6
Additions to property and equipment in accounts payable and accrued expenses$1,011
 $73
 $2,163
Proceeds from stock option exercises in other receivables$
 $32
 $186
Public offering costs in other receivables, net of amounts in accounts payable and accrued expenses$
 $230
 $
(In thousands) Years Ended December 31:202320222021
Operating activities
Net (loss) income$(352,088)$(231,801)$1,604,715 
Less: Net income from discontinued operations— — 1,961,225 
Net loss from continuing operations(352,088)(231,801)(356,510)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization6,623 8,564 9,240 
Stock-based compensation expense44,766 49,296 53,508 
Net (accretion of discount) amortization of premium on marketable securities(5,051)(1,198)6,949 
Gain on sale of contingent payments— (127,853)— 
Loss (gain) on disposal of property and equipment553 (48)12 
Non-cash operating lease expense10,720 9,995 9,537 
Expense associated with license agreement17,500 — — 
Realized gain on investments(28)— — 
Changes in operating assets and liabilities:
Accounts receivable, net(604)(2,206)— 
Inventory(10,584)(8,492)— 
Other receivables— 447 (4,378)
Prepaid expenses and other current and non-current assets3,833 (176)(26,846)
Accounts payable(8,733)3,436 1,863 
Accrued expenses12,817 (1,617)66 
Operating lease liabilities(13,663)(10,828)(7,527)
Other liabilities(2,123)3,003 — 
Net cash used in operating activities - continuing operations(296,062)(309,478)(314,086)
Net cash used in operating activities - discontinued operations— — (93,234)
Net cash used in operating activities(296,062)(309,478)(407,320)
Investing activities
Purchases of marketable securities(417,930)(1,030,781)(1,378,221)
Proceeds from maturities and sales of marketable securities674,679 1,146,175 829,804 
Proceeds from sale of contingent payments— 131,784 — 
Payments associated with license agreement(17,500)— — 
Purchases of property and equipment(999)(4,881)(5,741)
Proceeds from sale of equipment1,325 964 — 
Net cash provided by (used in) investing activities - continuing operations239,575 243,261 (554,158)
Net cash provided by investing activities - discontinued operations— — 1,802,936 
Net cash provided by investing activities239,575 243,261 1,248,778 
Financing activities
Payments on financing lease obligations— (331)(578)
Purchase of treasury stock— — (802,486)
Net proceeds from stock option exercises and employee stock purchase plan5,433 2,681 37,296 
Net cash provided by (used in) financing activities5,433 2,350 (765,768)
Net change in cash and cash equivalents(51,054)(63,867)75,690 
Cash and cash equivalents at beginning of the period139,259 203,126 127,436 
Cash and cash equivalents at end of the period$88,205 $139,259 $203,126 
Supplemental disclosure of non-cash investing and financing transactions:
Additions to property and equipment in accounts payable and accrued expenses$55 $158 $1,678 
Net cash taxes paid$1,569 $— $16,078 
Financing lease liabilities arising from obtaining financing lease assets$— $— $511 
See accompanying Notes to Consolidated Financial Statements.

F-8

Agios Pharmaceuticals, Inc.
Notes to Consolidated Financial Statements
Note 1. Nature of Business
References to Agios
Throughout this Annual Report on Form 10-K, “the Company,” “Agios,” “we,” “us,” and “our,” and similar expressions, except where the context requires otherwise, refer to Agios Pharmaceuticals, Inc. and its consolidated subsidiaries, and “our board of directors” refers to the board of directors of Agios Pharmaceuticals, Inc.
Overview
We are a biopharmaceutical company committed to the fundamental transformation oftransforming patients’ lives through scientific leadership in the field of cellular metabolism, with the goal of making transformative, first- or best-in-class medicines. Our therapeutic areascreating differentiated medicines for rare diseases, with a focus on classical hematology. With a history of focus are cancer and rare genetic diseases, or RGDs, which are diseases that are directly caused by changes in genes or chromosomes, often passed from one generation to the next. Most RGDs are often associated with severe or life-threatening features. The incidence of a single RGD can vary widely but is generally very infrequent, usually equal to or less than one per 100,000 births. In both areas of cancer and RGDs, we are seeking to unlock the biology offocused study on cellular metabolism, aswe have a platformdeep and mature understanding of this biology, which is involved in the healthy functioning of nearly every system in the body. Building on this expertise, these learnings can be rapidly applied to create transformative therapies.our clinical trials with the goal of developing medicines that can have a significant impact for patients. We accelerate the impact of our portfolio by cultivating connections with patient communities, healthcare professionals, partners and colleagues to discover, develop and deliver potential therapies for rare diseases. We are located in Cambridge, Massachusetts.
Our first commercial cancerThe lead product candidate in our portfolio, PYRUKYND® (mitapivat), is IDHIFA®.an activator of both wild-type and mutant pyruvate kinase, or PK, enzymes for the potential treatment of hemolytic anemias. In August 2017,February 2022, the U.S. Food and Drug Administration, or FDA, granted our collaboration partner Celgene Corporation, or Celgene, approval of IDHIFA®approved PYRUKYND® for the treatment of adult patientshemolytic anemia in adults with relapsed or refractory acute myeloid leukemia, or R/R AML, and an isocitrate dehydrogenase 2, or IDH2, mutation as detected by an FDA-approved test. IDHIFA®, an oral targeted inhibitor ofPK deficiency in the mutated IDH2 enzyme, isUnited States. In November 2022, we received marketing authorization from the first and only FDA-approved therapyEuropean Commission for patients with R/R AML and an IDH2 mutation.
Our most advanced clinical cancer product candidates are ivosidenib, which targets mutated isocitrate dehydrogenase 1, or IDH1, and AG-881, which is a brain-penetrant pan-IDH mutant inhibitor. These mutations are found in a wide range of hematological malignancies and solid tumors. In December 2017, we submitted a new drug application, or NDA, to the FDA for ivosidenibPYRUKYND® for the treatment of PK deficiency in adult patients with R/R AML and an IDH1 mutation. We plan to submit an Marketing Authorization Application, or MAA, toin the European Medicines Agency,Union, or EMA,EU. In December 2022, we received marketing authorization in Great Britain for ivosidenib for IDH1 mutant-positive R/R AML in the fourth quarter of 2018.
Our next most advanced cancer product candidate is AG-270, an inhibitor of methionine adenosyltransferase 2a, or MAT2A. We submitted an investigational new drug application, or IND, for AG-270 in November 2017, and in December 2017 the FDA concluded that we may proceed with our planned phase 1 dose-escalation trial of AG-270 in multiple tumor types carrying a methylthioadenosine phosphorylase, or MTAP, deletion.
Our most advanced preclinical cancer product candidate is an inhibitor of the metabolic enzyme dihydroorotate dehydrogenase, or DHODH. We plan to submit an IND for our DHODH inhibitorPYRUKYND® for the treatment of hematologic malignanciesPK deficiency in adult patients under the fourth quarter of 2018.
The lead product candidateEuropean Commission Decision Reliance Procedure. In addition, we are currently evaluating PYRUKYND® in our RGD program, AG-348, targets pyruvate kinase-Rclinical trials for the treatment of pyruvate kinase,thalassemia, sickle cell disease, or SCD, and in pediatric patients with PK deficiency. We are also developing (i) AG-946, a novel PK deficiency is a rare genetic disorder that often results in severeactivator, for the potential treatment of lower-risk myelodysplastic syndrome, or LR MDS, and hemolytic anemia, jaundiceanemias, and lifelong conditions associated with chronic anemia and secondary complications due to inherited mutations in(ii) AG-181, our phenylalanine hydroxylase, or PAH, stabilizer for the pyruvate kinase enzyme within red blood cells,potential treatment of phenylketonuria, or RBCs. We intend to initiate two global, pivotal trials of AG-348 in PK deficiency in the first half of 2018: ACTIVATE-T, a single arm trial of approximately 20 regularly transfused patients, is expected to initiate in the first quarter of 2018, and ACTIVATE, a 1:1 randomized, placebo-controlled trial of approximately 80 patients who do not receive regular transfusions, is expected to initiate in the second quarter of 2018. We also expect to initiate a phase 2 proof of concept trial of AG-348 in thalassemia in the fourth quarter of 2018.PKU.

In addition to the aforementioned development programs, in July 2023 we entered into a license agreement with Alnylam Pharmaceuticals, Inc., or Alnylam for the development and commercialization of products containing or comprised of an siRNA preclinical development candidate discovered by Alnylam and targeting the transmembrane serine protease 6, or TMPRSS6, gene and we intend to pursue development of a licensed product for the potential disease-modifying treatment of patients with polycythemia vera, or PV, a rare blood disorder.

We are subject to risks common to companies in our industry including, but not limited to, uncertainties relating to conducting preclinical and clinical research and development, the manufacture and supply of products for clinical and commercial use, obtaining and maintaining regulatory approvals and pricing and reimbursement for our products, market acceptance, managing global growth and operating expenses, availability of additional capital, competition, obtaining and enforcing patents, stock price volatility, dependence on collaborative relationships and third-party service providers, dependence on key personnel, potential litigation, potential product liability claims and potential government investigations.
Alnylam License Agreement
On July 28, 2023, we entered into a license agreement with Alnylam under which we acquired the rights to develop and commercialize Alnylam’s novel preclinical siRNA targeting the TMPRSS6 gene, as a potential disease-modifying treatment for patients with PV. Because the acquired assets do not meet the definition of a business in accordance with ASC 805, Business Combinations, we will account for the agreement as an asset acquisition.
In accordance with the license agreement, in the twelve months ended December 31, 2023, we made an up-front payment to Alnylam and recognized in-process research and development of $17.5 million which was recorded in research and development expense within our Consolidated Statements of Operations and classified as investing activities within our Consolidated Statements of Cash Flows. We will also pay Alnylam for certain expenses associated with the development of TMPRSS6 and these will be recorded in our Consolidated Statements of Operations as incurred. Additionally, we are seekingresponsible to advance a numberpay up to $130.0 million in potential development and regulatory milestones, in addition to sales milestones as well as tiered royalties on annual net sales, if any, of early-stage discovery programs in the areaslicensed products, which may be subject to specified reductions and offsets.
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Sale of Oncology Business to Servier and metabolic immuno-oncology, or MIO, a developing field which aims to modulate the activitySale of relevant immune cells by targeting critical metabolic nodes, thereby, enhancing the immune mediated anti-tumor response.Contingent Payments
Liquidity
In April 2017,On March 31, 2021, we completed the sale of our oncology business to Servier Pharmaceuticals, LLC, or Servier, which represented a public offeringdiscontinued operation. The transaction included the sale of 5,050,505 sharesour oncology business, including TIBSOVO®, our clinical-stage product candidates vorasidenib, AG-270 and AG-636, and our oncology research programs for a payment of common stockapproximately $1.8 billion in cash at the closing, subject to certain adjustments, and a payment of $200.0 million in cash, if, prior to January 1, 2027, vorasidenib is granted new drug application, or NDA, approval from the FDA with an offering priceapproved label that permits vorasidenib’s use as a single agent for the adjuvant treatment of $49.50 per share. We receivedpatients with Grade 2 glioma that have an isocitrate dehydrogenase 1 or 2 mutation (and, to the extent required by such approval, the vorasidenib companion diagnostic test is granted an FDA premarket approval), as well as a royalty of 5% of U.S. net proceedssales of TIBSOVO® from this offeringthe close of $235.0 million, after deducting underwriting discountsthe transaction through loss of exclusivity, and commissions paid by us. In addition, we granteda royalty of 15% of U.S. net sales of vorasidenib from the underwritersfirst commercial sale of vorasidenib through loss of exclusivity. Servier also acquired our co-commercialization rights for Bristol Myers Squibb’s IDHIFA® and the right to purchase upreceive a $25.0 million potential milestone payment under our prior collaboration agreement with Celgene Corporation, or Celgene, and following the sale Servier will conduct certain clinical development activities within the IDHIFA® development program.
In October 2022, we sold our rights to an additional 757,575 sharesfuture contingent payments associated with the royalty of common stock, which was exercised5% of U.S. net sales of TIBSOVO® from the close of the transaction through the loss of exclusivity to entities affiliated with Sagard Healthcare Partners, or Sagard, and recognized income of $127.9 million within the gain on sale of contingent payments line item in April 2017, resulting in additional net proceeds to usour Consolidated Statements of $35.2 million, after underwriting discounts and


commissions. After giving effectOperations for the year ended December 31, 2022. We retain our rights to the full exercisepotential milestone payment and royalties from Servier if a new drug application for vorasidenib is approved by the FDA.
We recorded income from royalties of $9.9 million and $6.6 million on U.S. net sales of TIBSOVO® by Servier in the royalty income from gain on sale of oncology business line item within the consolidated statements of operations for the years ended December 31, 2022 and December 31, 2021, respectively.
Reclassifications
Certain amounts in prior periods have been reclassified to reflect the impact of the over-allotment option,discontinued operations treatment of the number of shares sold by usoncology business in the public offering totaled 5,808,080 shares, and net proceedsorder to us totaled $270.2 million, after underwriting discounts and commissions.
In January 2018, we completed a public offering of 7,089,553 shares of common at an offering price of $67.00 per share. We received net proceeds from this offering of $448.9 million, after deducting underwriting discounts and commissions paid by us. In addition, we granted the underwriters the right to purchase up to an additional 1,063,433 shares of common stock, which was exercised in January 2018, resulting in additional net proceeds to us of $67.3 million, after underwriting discounts and commissions. After giving effectconform to the full exercise of the over-allotment option, the number of shares sold by us in the public offering totaled 8,152,986 shares, and net proceeds to us totaled $516.2 million, after underwriting discounts and commissions.current period presentation.
Liquidity
As of December 31, 2017,2023, we had cash, cash equivalents and marketable securities of $567.8$806.4 million. Although we have incurred recurring losses and expect to continue to incur losses for the foreseeable future, we expect our cash, cash equivalents and marketable securities to be sufficient to fund current operations for at least the next twelve months from the issuance of the financial statements. If we are unable to raise additional funds through equity or debt financings, we may be required to delay, limit, reduce or terminate product development or future commercialization efforts or grant rights to develop and market products or product candidates that we would otherwise prefer to develop and market ourselves.
On April 30, 2020, we entered into an at-the-market sales agreement, or the 2020 sales agreement, with Cowen & Company LLC, or Cowen, pursuant to which we may offer and sell shares of our common stock having an aggregate offering price of up to $250.0 million through Cowen pursuant to a universal shelf registration statement on Form S-3 filed with the SEC on April 30, 2020. As of December 31, 2022, $250.0 million in common stock remained available for future issuance under the 2020 sales agreement. On February 15, 2023, we delivered written notice to Cowen that we were terminating the 2020 sales agreement, effective on February 22, 2023. As of the termination of the 2020 sales agreement, we had not sold any shares of our common stock under the 2020 sales agreement.
Note 2. Summary of Significant Accounting Policies
Principles of consolidation
The consolidated financial statements include our accounts and the accounts of our wholly owned subsidiaries, Agios Securities Corporation, Agios International Sarl (GmbH), Agios Germany GmbH, Agios Netherlands B.V., Agios Italy S.R.L., Agios France SARL, and Agios Limited. All intercompany transactions have been eliminated in consolidation. The consolidated financial statements have been prepared in conformity with U.S. generally accepted accounting principles, or U.S. GAAP.
Use of estimates
The preparation of our consolidated financial statements in conformity with U.S. GAAP requires us to make estimates, judgments and assumptions that may affect the reported amounts of assets, liabilities, equity, revenues and liabilities,expenses and related disclosure of contingent assets and liabilities at the date of the financial statementsliabilities. On an ongoing basis we evaluate our estimates, judgments and the reported amounts of revenue and expenses during the reporting period.methodologies. We base our estimates on historical experience and on various other assumptions that we believe are believedreasonable, the results of which form the basis for making judgments about the carrying values of assets, liabilities and equity and the amount of revenues and expenses. The full extent to be reasonable under
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which the circumstances. Actualrecent COVID-19 pandemic, or other pandemics or public health emergencies, may in the future directly or indirectly impact our business, results could differ from those estimates.of operations and financial condition, including expenses, reserves and allowances, clinical trials, research and development costs and employee-related amounts, will depend on future developments that are highly uncertain.
Cash and cash equivalents
We consider highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. Cash equivalents are stated at fair value.
Accounts receivable, net
Our trade accounts receivable arise from product sales and represent amounts due from specialty distributors and specialty pharmacy providers in the U.S. We monitor the financial performance and creditworthiness of our customers so that we can properly assess and respond to changes in their credit profile. We reserve against these receivables for estimated losses that may arise from a customer’s inability to pay. Amounts determined to be uncollectible are charged or written-off against the reserve.

Inventory
Inventory is stated at the lower of cost or estimated net realizable value on a first-in, first-out basis. Prior to the regulatory approval of our product candidates, we incur expenses for the manufacture of drug product that could potentially be available to support the commercial launch of those products. Until the date at which regulatory approval has been received or is otherwise considered probable, we record all such costs as research and development expenses. Upon approval of our wholly owned product, PYRUKYND®, by the FDA on February 17, 2022 for the treatment of hemolytic anemia in adults with PK deficiency in the United States, we began to capitalize inventories of PYRUKYND®.

Revenue recognition
Under Accounting Standards Codification 606, Revenue from Contracts with Customers, or ASC 606, revenue is recognized when the customer obtains control of promised goods or services, in an amount that reflects the consideration that we expect to receive in exchange for those goods or services. To determine revenue recognition for arrangements that have been determined to be within the scope of ASC 606, we perform the following five steps: (i) identify the contract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when (or as) we satisfy a performance obligation. We only apply the five-step model to contracts when it is probable that we will collect the consideration we are entitled to in exchange for the goods or services we transfer to the customer.
This standard applies to all contracts with customers, except for contracts that are within the scope of other standards, such as leases, insurance, collaboration arrangements and financial instruments.
Once the contract is determined to be within the scope of ASC 606, we assess the goods or services promised within each contract and determine those that are performance obligations, and assess whether each promised good or service is distinct. We will then recognize as revenue the amount of the transaction price that is allocated to the respective performance obligation when (or as) the performance obligation is satisfied.
Product Revenue
We generate product revenue from sales of PYRUKYND® to a limited number of specialty distributors and specialty pharmacy providers, or collectively, the Customers. These Customers subsequently resell PYRUKYND® to pharmacies or dispense PYRUKYND® directly to patients. In addition to distribution agreements with Customers, we enter into arrangements with healthcare providers and payors that provide for government-mandated and/or privately-negotiated rebates, chargebacks and discounts with respect to the purchase of PYRUKYND®.
The performance obligation related to the sale of PYRUKYND® is satisfied and revenue is recognized when the Customer obtains control of the product, which occurs at a point in time, typically upon delivery to the Customer.
Revenues from product sales are recorded at the net sales price, or transaction price, which includes estimates of variable consideration for which reserves are established and result from contractual adjustments, government rebates, returns and other allowances that are offered within the contracts with our Customers, healthcare providers, payors and other indirect customers relating to the sale of our products.
Contractual Adjustments. We generally provide Customers with discounts, including prompt pay discounts, and allowances that are explicitly stated in the contracts and are recorded as a reduction of revenue in the period the related product revenue is recognized. In addition, we receive sales order management, data and distribution services from certain Customers.
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Chargebacks and discounts represent the estimated obligations resulting from contractual commitments to sell products to qualified healthcare providers at prices lower than the list prices charged to Customers who directly purchase the product from us. Customers charge us for the difference between what they pay for the product and the ultimate selling price to the qualified healthcare providers. These reserves are estimated using the expected value method, based upon a range of possible outcomes that are probability-weighted for the estimated channel mix and are established in the same period that the related revenue is recognized, resulting in a reduction of product revenue.
Government Rebates. Government rebates include Medicare, TriCare, and Medicaid rebates, which we estimate using the expected value method, based upon a range of possible outcomes that are probability-weighted for the estimated payor mix. These reserves are recorded in the same period the related revenue is recognized, resulting in a reduction of product revenue. For Medicare, we also estimate the number of patients in the prescription drug coverage gap for whom we will owe an additional liability under the Medicare Part D program.
Returns. We estimate the amount of product sales that may be returned by Customers and record this estimate as a reduction of revenue in the period the related product revenue is recognized. We currently estimate product return liabilities using the expected value method, based on available industry data, including our visibility into the inventory remaining in the distribution channel.
Cost of sales
Cost of sales consists primarily of manufacturing costs for sales of PYRUKYND®. Based on our policy to expense costs associated with the manufacturing of our products prior to regulatory approval, certain of the manufacturing costs associated with product shipments of PYRUKYND® recorded during the twelve months ended December 31, 2023 and 2022 were expensed prior to February 17, 2022 and, therefore, are not included in costs of sales during the twelve months ended December 31, 2023 and 2022.
Marketable securities
Marketable securities at December 31, 20172023 and 20162022 consisted of investments in certificates of deposit, U.S. Treasuries, government securities and corporate debt securities. We determine the appropriate classification of the securities at the time they are acquired and evaluate the appropriateness of such classifications at each balance sheet date. We classify our marketable securities as available-for-sale pursuant to ASC 320, Investments – Debt and Equity Securities. Marketable securities are recorded at fair value, with unrealizedvalue. Unrealized gains and losses are included as a component of accumulated other comprehensive loss(loss) income in the consolidated balance sheets and statements of stockholders’ equity and a component of total comprehensive loss(loss) income in the consolidated statements of comprehensive loss,(loss) income, until realized. Realized gains and losses are included in investment income on a specific-identification basis.
At December 31, 20172023 and 2016,2022, we held both current and non-current investments. Investments classified as current are those that: (i) have maturitiesa maturity of less than one year.year, or (ii) have a maturity of one to two years but we intend to liquidate within the next twelve months. Investments classified as non-current are those that: (i) have a maturity of one to two years, and (ii) we do not intend to liquidate within the next twelve months,one year, although these funds are available for use and therefore classified as available-for-sale.
We review marketable securities for other-than-temporary impairment whenever the fair value of a marketable security is less than the amortized cost and evidence indicates that a marketable security’s carrying amount is not recoverable withinrecoverable. Unrealized losses are evaluated for impairment under ASC 326, Financial Instruments - Credit Losses, to determine if the impairment is credit-related or noncredit-related. Credit-related impairment is recognized as an allowance on the balance sheet with a reasonable period of time. Other-than-temporary impairments of investments arecorresponding adjustment to earnings, and noncredit-related impairment is recognized in the consolidated statementsother comprehensive (loss) income, net of operations if we experience a credit loss, have the intent to sell the marketable security, or if it is more likely than not that we will be required to sell the marketable security before recovery of the amortized cost basis.taxes. Evidence considered in this assessment includes reasons for the impairment, compliance with our investment policy, the severity and the duration of the impairment, collectability of the security, and changesany adverse conditions specifically related to the security, an industry, or geographic area.
Fair value measurements
We record cash equivalents and marketable securities at fair value. ASC 820, Fair Value Measurements and Disclosures, establishes a fair value hierarchy for those instruments measured at fair value that distinguishes between assumptions based on market data (observable inputs) and our own assumptions (unobservable inputs). The hierarchy consists of three levels:
Level 1 – Unadjusted quoted prices in value subsequent toactive markets for identical assets or liabilities.
Level 2 – Quoted prices for similar assets and liabilities in active markets, quoted prices in markets that are not active, or inputs which are observable, either directly or indirectly, for substantially the full term of the asset or liability.
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Level 3 – Unobservable inputs that reflect our own assumptions about the assumptions market participants would use in pricing the asset or liability in which there is little, if any, market activity for the asset or liability at the measurement date.
Our financial assets, which include cash equivalents and marketable securities, have been initially valued at the transaction price, and subsequently revalued at the end of each reporting period, utilizing third-party pricing services or other observable market data. The pricing services utilize industry standard valuation models, including both income and market based approaches, and observable market inputs to determine value. After completing our validation procedures, we did not adjust or override any fair value measurements provided by the pricing services as of December 31, 2023 or 2022. Fair value information for these assets, including their classification in the fair value hierarchy is included in Note 3, Fair Value Measurements.
There have been no changes to the valuation methods during the years ended December 31, 2023 and 2022. We evaluate transfers between levels at the end of each reporting period.
The carrying amounts of other receivables, prepaid expenses and other current assets, accounts payable, and accrued expenses approximate their fair values due to their short-term maturities.
Concentrations of credit risk
Financial instruments which potentially subject us to credit risk consist primarily of cash, cash equivalents, and marketable securities. We hold these investments in highly rated financial institutions, and, by policy, limit the amounts of credit exposure to any one financial institution. These amounts at times may exceed federally insured limits. We have not experienced any credit losses in such accounts and do not believe we are exposed to any significant credit risk on these funds. We have no off-

balanceoff-balance sheet concentrations of credit risk, such as foreign currency exchange contracts, option contracts, or other hedging arrangements.
We are also subject to credit risk on our collaboration and royalty receivables from Celgene. We have evaluated the creditworthiness of Celgene and determined it to be credit worthy. To date we have not experienced any losses with respect to our receivables.
Fair value measurements
We record cash equivalents and marketable securities at fair value. ASC 820, Fair Value Measurements and Disclosures, establishes a fair value hierarchy for those instruments measured at fair value that distinguishes between assumptions based on market data (observable inputs) and our own assumptions (unobservable inputs). The hierarchy consists of three levels:
Level 1 – Unadjusted quoted prices in active markets for identical assets or liabilities.
Level 2 – Quoted prices for similar assets and liabilities in active markets, quoted prices in markets that are not active, or inputs which are observable, either directly or indirectly, for substantially the full term of the asset or liability.
Level 3 – Unobservable inputs that reflect our own assumptions about the assumptions market participants would use in pricing the asset or liability in which there is little, if any, market activity for the asset or liability at the measurement date.
Our financial assets, which include cash equivalents and marketable securities, have been initially valued at the transaction price, and subsequently revalued at the end of each reporting period, utilizing third-party pricing services or other observable market data. The pricing services utilize industry standard valuation models, including both income and market based approaches, and observable market inputs to determine value. After completing our validation procedures, we did not adjust or override any fair value measurements provided by the pricing services as of December 31, 2017 or 2016.
There have been no changes to the valuation methods during the years ended December 31, 2017 and 2016. We evaluate transfers between levels at the end of each reporting period.
The carrying amounts of collaboration receivable related party, royalty receivable related party, tenant improvement and other receivables, prepaid expenses and other current assets, accounts payable, and accrued expenses approximate their fair values due to their short-term maturities.
Collaboration, royalty and other receivables
Collaboration receivable related party and royalty receivable related party represent amounts due under the terms of our collaboration agreements with Celgene for reimbursements of certain costs and royalty on sales of IDHIFA®, respectively.
Based on our evaluation of credit worthiness, historical payment patterns, and general economic conditions, we did not record any allowance for doubtful accounts as of December 31, 2017 and 2016.
Property and equipment
Property and equipment consist of laboratory equipment, computer equipment and software, leasehold improvements, furniture and fixtures, and office equipment. Property and equipment is stated at cost, and depreciated using the straight-line method over the estimated useful lives of the respective assets:
Laboratory equipment5 years
Computer equipment and software3 years
Leasehold improvementsShorter of asset’s useful life or remaining term of lease
Furniture and fixtures5 years
Office equipment5 years
Costs of major additions and bettermentsbetterment are capitalized; maintenance and repairs, which do not improve or extend the life of the respective assets, are charged to expense as incurred. Upon retirement or sale, the cost of the disposed asset and the related accumulated depreciation are removed from the accounts and the resulting gain or loss is recognized.

Property and equipment is stated at cost, and depreciated using the straight-line method over the estimated useful lives of the respective assets:
Years
Laboratory equipment5
Computer equipment and software3
Furniture and fixtures5
Office equipment5
Leasehold improvements are amortized over the lesser of the remaining lease term or the estimated useful life of the improvement.
Impairment of long-lived assets
We periodically evaluate our long-lived assets for potential impairment in accordance with ASC 360, Property, Plant and Equipment. Potential impairment is assessed when there is evidence that events or changes in circumstances indicate that the carrying amount of an asset may not be recovered. Recoverability of these assets is assessed based on the undiscounted expected future cash flows from the assets, considering a number of factors, including past operating results, budgets and economic projections, market trends and product development cycles. If impairments are identified, assets are written down to their estimated fair value. We did not recognize any impairment charges through December 31, 2017.2023.
Revenue recognitionLeases
We recognize revenuedetermine if an arrangement is a lease at inception. An arrangement is determined to contain a lease if the contract conveys the right to control the use of an identified property or equipment for a period of time in accordanceexchange for consideration. If we can benefit from the various underlying assets of a lease on their own or together with other resources that are readily available, or if the Financial Accounting Standards Board’s, or FASB, Accounting Standards Codification, or ASC, 605, Revenue Recognition. Accordingly, revenuevarious underlying assets are neither highly dependent on nor highly interrelated with other underlying assets in the
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arrangement, they are considered to be a separate lease component. In the event multiple underlying assets are identified, the lease consideration is recognized forallocated to the various components based on each unit of accounting when all of the following criteria are met:component’s relative fair value.
persuasive evidence ofOperating lease assets represent our right to use an arrangement exists;
delivery has occurred or services have been rendered;
the seller’s price to the buyer is fixed or determinable; and
collectability is reasonably assured.
Amounts received prior to satisfying the revenue recognition criteria are recorded as deferred revenue. Amounts expected to be recognized as revenue within the 12 months following the balance sheet date are classified current and amounts not expected to be recognized as revenue within the 12 months following the balance sheet date are classified as non-current.
Collaboration agreements with Celgene
To date, our revenue has primarily been generated from our collaboration agreements with Celgene. Celgene is a related party through ownership of our common stock. In April 2010, we entered into a collaboration agreement with Celgene focused on cancer metabolism, or the 2010 Agreement. The 2010 Agreement was amended in October 2011 and July 2014. On April 27, 2015, we entered into a joint worldwide development and profit share collaboration and license agreement with Celgene, and our wholly owned subsidiary, Agios International Sarl, entered into a collaboration and license agreement with Celgene's wholly owned subsidiary, Celgene International II Sarl, or collectively, the AG-881 Agreements, to establish a worldwide collaboration focused on the development and commercialization of AG-881 products. On May 17, 2016, we entered into a master research and collaboration agreement with Celgene, or the 2016 Agreement.
Collaboration and license revenue
We accountunderlying asset for the collaboration agreements with Celgene under ASC 605-25, Revenue Recognition - Multiple-Element Arrangements, or ASC 605-25. Pursuantlease term and operating lease liabilities represent our obligation to ASC 605-25, revenue arrangements where multiple products or servicesmake lease payments arising from the leasing arrangement. Operating lease assets and operating lease liabilities are sold together are evaluated to determine if each deliverable represents a separate unit of accountingrecognized at commencement date based on the following criteria:present value of lease payments over the lease term. As most of our leases do not provide an implicit rate, in determining the operating lease liabilities we use an estimate of our incremental borrowing rate. The incremental borrowing rate is determined using two alternative credit scoring models to estimate our credit rating, adjusted for collateralization. The calculation of the operating lease assets includes any lease payments made and excludes any lease incentives. Our lease terms may include options to extend or terminate the lease when it is reasonably certain that we will exercise that option.
delivered item or items have value to the customerFor operating leases, we record operating lease assets and lease liabilities in our consolidated balance sheets. Lease expense for lease payments is recognized on a standalonestraight-line basis and
ifover the arrangement includeslease term. Short-term leases, or leases that have a general rightlease term of return relative to the delivered item12 months or items, delivery or performance of the undelivered item or items is considered probableless at commencement date, are excluded from this treatment and substantially in the control of the vendor.
Ifare recognized on a deliverable meets both criteria above, it is considered a separate unit of accounting. If a deliverable does not meet both criteria above, it will be evaluated in combination with other deliverables and, if appropriate, aggregated to form one unit of accounting. The arrangement consideration is then allocated to each unit of accounting based on the relative selling price, using our best estimate of selling price, or BESP, of each unit of accounting, if vendor specific objective evidence or third party evidence is not available. The provisions of ASC 605-25 are then applied to each unit of accounting to determine the appropriate revenue recognition.
We recognize revenue for the units of accountingstraight-line basis over the term of the related contractlease.
We have not entered into any material short-term leases or financing leases as undelivered items are delivered (proportional performance method), as appropriate. Under the proportional performance method, the consideration allocated to each unit of accounting is recognized as revenue based on the ratio of the level of effort incurred to date compared to the total estimated level of effort required to complete our performance obligations under the unit of accounting. Determining the total estimated level of effort required to complete all performance obligations requires judgment and estimation, including assumptions regarding future operating performance, the timelines of the clinical trial approvals and the estimated patient populations.
Reimbursement of research and development costs under our collaboration agreements with Celgene are recognized as revenue, provided that we are acting as the principal in the transaction according to the provisions outlined in ASC 605-45, Revenue

Recognition – Principal Agent Considerations, the amounts are determinable, and collection of the related receivable is reasonably assured.
Milestone revenue
We apply the provisions of ASC 605-28, Revenue Recognition – Milestone Method, or ASC 605-28, pursuant to which we recognize revenue contingent upon the achievement of a milestone in its entirety in the period in which the milestone is achieved, only if the milestone meets all the criteria within the guidance to be considered substantive. In accordance with ASC 605-28, at the inception of each arrangement that includes milestone payments, we evaluate each contingent payment on an individual basis to determine whether they are considered substantive milestones, specifically reviewing factors such as the degree of certainty in achieving the milestone, the research and development risk and other risks that must be overcome to achieve the milestone, as well as the level of effort and investment required and whether the milestone consideration is reasonable relative to all deliverables and payment terms in the arrangement. This evaluation includes an assessment of whether (a) the consideration is commensurate with either (1) our performance to achieve the milestone, or (2) the enhancement of the value of the delivered item(s) as a result of a specific outcome resulting from our performance to achieve the milestone, (b) the consideration relates solely to past performance, and (c) the consideration is reasonable relative to all of the deliverables and payment terms within the arrangement.
Revenue from milestones, if they are nonrefundable and deemed substantive, are recognized upon achievement of the milestones. We recognize revenue associated with non-substantive milestones upon achievement of the milestone if there are no undelivered elements and we have no remaining performance obligations.December 31, 2023.
Research and development costs
Research and development costs, including those accrued as of each balance sheet date, are expensed as incurred. These costs include salaries and personnel-related costs, consulting fees, fees paid for contract research services, fees paid to clinicalcontract research organizations, or CROs, and other third parties associatedin connection with clinical trials and preclinical development activities, fees paid to investigative sites in connection with clinical studies, the costs associated with the product manufacturing, development, and distribution of clinical supplies, the costs of laboratory equipment and facilities, and other external costs.
Nonrefundable advance payments for goods or services to be received in the future for use in research and development activities are deferred and capitalized. Additionally, there may be instances in which payments made to our vendors will exceed the level of services provided, and result in a prepayment of the research and development expense. The capitalized amounts are expensed as the related goods are delivered or the services are performed. We estimate the time period over which services will be performed and the level of effort to be expended in each period. If the actual timing of the performance of services or the level of effort varies from our estimate, we adjust the accrual or prepaid accordingly.
Stock-based compensation
We account for stock-based compensation awards in accordance with ASC 718, Compensation –Stock Compensation, or ASC 718. For stock-based awards granted to employees, non-employees and to members of the board of directors for their services and for participation in our employee stock purchase plan, we estimate the grant date fair value of each option award using the Black-Scholes option-pricing model. The use of the Black-Scholes option-pricing model requires us to make assumptions with respect to the expected term of the option, the expected volatility of the common stock consistent with the expected life of the option, risk-free interest rates and expected dividend yields of the common stock. For awards subject to service-based vesting conditions, we recognize stock-based compensation expense equal to the grant date fair value of stock options on a straight-line basis over the requisite service period.period. For awards subject to both performance and service-basedperformance-based vesting conditions, we recognize stock-based compensation expense over the remaining service period if the performance condition is considered probable of achievement using management’s best estimates.
In 2017, we adopted Accounting Standards Update, or ASU, 2016-09, Compensation—Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, or ASU 2016-09, which simplifies several aspects of the accounting for employee share-based payment transactions, including income tax consequences, classification of awards as either equity or liabilities, and classification in the statement of cash flows. The following summarizes the effects of the adoption on our consolidated financial statements:
Income taxes – Upon adoption of this standard, all excess tax benefits and tax deficiencies are recognized as income tax expense or benefit in the statement of operations. The tax effects of exercised or vested awards are treated as discrete items in the reporting period in which they occur. We did not recognize any discrete adjustments to income tax expense for the year ended December 31, 2017, as we are in a full valuation allowance position. We applied the modified retrospective adoption approach beginning in 2017. This cumulative-effect adjustment related to tax assets that had previously arisen from tax deductions for stock-based compensation expenses that were greater than the compensation recognized for financial reporting. These assets had been excluded from the deferred tax assets and liabilities totals on the balance sheet as a result of certain realization requirements previously included in ASC 718. We recorded a cumulative-effect adjustment of approximately $32.7 million through retained earnings and deferred tax assets; however, due to the full valuation allowance, the only impact of the retrospective adoption is on disclosures presented in Note 11, Income Taxes.

Forfeitures – Upon adoption of ASU 2016-09, entities may also elect to estimate forfeitures and adjust the estimate when it is likely to change, which is consistent with pre-ASU 2016-09 guidance, or account for forfeitures as they occur. Beginning in January 1, 2017, we elected to account for forfeitures as they occur. The ASU is applied on a prospective basis, and prior periods have not been adjusted to reflect this change in accounting policy. The cumulative effect of the change in forfeiture policy in prior periods did not have a material impact on our statement of operations or balance sheet.
Upon adoption, no other aspects of ASU 2016-09 had a material effect on our consolidated financial statements or related footnote disclosures.
Income taxes
Income taxes are recorded in accordance with ASC 740, Accounting for Income Taxes, or ASC 740, which provides for deferred taxes using an asset and liability approach. We recognize deferred tax assets and liabilities for the expected future tax consequences of events that have been included in our financial statements or tax returns. We determine our deferred tax assets and liabilities based on differences between the financial reporting and tax bases of assets and liabilities, which are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reverse. Valuation allowances are provided, if based upon the weight of available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized.
We also account for uncertain tax positions in accordance with the provisions of ASC 740. When uncertain tax positions exist, we recognize the tax benefit of tax positions to the extent that the benefit will more likely than not be realized. The determination as to whether the tax benefit will more likely than not be realized is based upon the technical merits of the tax position as well as consideration of the available facts and circumstances.
Comprehensive income (loss)
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Comprehensive (loss) income
Comprehensive (loss) income is defined as the change in equity of a business enterprise during a period from transactions, and other events and circumstances, from non-owner sources, and currently consists of net loss and unrealized gains and losses on available-for-sale securities. Accumulated other comprehensive loss(loss) income consists entirely of unrealized gains and losses from available-for-sale securities as of December 31, 20172023 and 2016.2022.
Net loss(loss) income per share
Basic net loss(loss) income per share is calculated by dividing net loss(loss) income by the weighted-average shares outstanding during the period, without consideration for common stock equivalents. Diluted net loss(loss) income per share is calculated by adjusting weighted-average shares outstanding for the dilutive effect of common stock equivalents outstanding for the period, determined using the treasury-stock method. For purposes of the dilutive net loss(loss) income per share calculation, stock options, including performance-based stock options which were determined to be probable of achievement, restricted stock units, unvested restrictedor RSUs, performance-based stock units, or PSUs, and market-based stock units, or MSUs, for which the performance and market vesting conditions, respectively, have been deemed probable, and employee stock purchase plan shares are considered to be common stock equivalents but are excluded from the calculation of diluted net loss(loss) income per share as their effect would be anti-dilutive.
We utilize the control number concept in the computation of diluted earnings per share to determine whether potential common stock equivalents are dilutive. The control number used is loss from continuing operations. The control number concept requires that the same number of potentially dilutive securities applied in computing diluted earnings per share from continuing operations be applied to all other categories of income or loss, regardless of their anti-dilutive effect on such categories. Since we had a net loss from continuing operations for all periods presented, no dilutive effect has been recognized in the calculation of income (loss) from discontinued operations per share or net (loss) income per share.
Segment and geographic information
Operating segments are identified as components of an enterprise about which separate discrete financial information is available for evaluation by the chief operating decision maker or decision-making group in making decisions on how to allocate resources and assess performance. Our chief operating decision maker is the chief executive officer. Our chief operating decision maker and we view our operations and manage our business as one operating segment.
Discontinued operations
We accounted for the sale of our oncology business in the first quarter of 2021 in accordance with ASC 205, Discontinued Operations and Accounting Standards Update, or ASU, No. 2014-08, Reporting of Discontinued Operations and Disclosures of Disposals of Components of an Entity. We followed the held-for-sale criteria as defined in ASC 360, Property, Plant and Equipment, and ASC 205. ASC 205 requires that a component of an entity that has been disposed of or is classified as held for sale and has operations and cash flows that can be clearly distinguished from the rest of the entity be reported as assets held for sale and discontinued operations. In the period a component of an entity has been disposed of or classified as held for sale, the results of operations for the periods presented are reclassified into separate line items in the consolidated statements of operations. Assets and liabilities are also reclassified into separate line items on the related consolidated balance sheets for the periods presented. The statements of cash flows for the periods presented are also reclassified to reflect the results of discontinued operations as separate line items. ASU 2014-08 requires that only a disposal of a component of an entity, or a group of components of an entity, that represents a strategic shift that has, or will have, a major effect on the reporting entity’s operations and financial results be reported in the financial statements as discontinued operations. ASU 2014-08 also provides guidance on the financial statement presentations and disclosures of discontinued operations.
Due to the sale of our oncology business during the first quarter of 2021, in accordance with ASC 205, we have classified the results of the oncology business as discontinued operations in our consolidated statements of operations and cash flows for all periods presented, and refer to Note 15, Discontinued Operations. All amounts included in the notes to the consolidated financial statements relate to continuing operations unless otherwise noted.
Treasury stock
Treasury stock purchases are accounted for under the cost method whereby the entire cost of the acquired stock is recorded as treasury stock.
Recent accounting pronouncements
Revenue from Contracts with Customers
In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), or ASU 2014-09. Subsequently, the FASB issued ASU 2015-14, Revenue from Contracts with Customers (Topic 606), which adjusted the effective date of ASU 2014-09; ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net), which amends the principal-versus-agent implementation guidance and illustrations in ASU 2014-09; ASU No. 2016-10, Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing, which clarifies identifying performance obligations and licensing implementation guidance and illustrations in ASU 2014-09; ASU No. 2016-12, Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients, which addresses implementation issues and is intended to reduce the cost and complexity of applying the new revenue standard in ASU 2014-09; ASU No. 2017-13, Revenue Recognition (Topic 605), Revenue from Contracts with Customers (Topic 606), Leases (Topic 840), and Leases (Topic 842): Amendments to SEC Paragraphs Pursuant to the Staff Announcement at the July 20, 2017 EITF Meeting and Rescission of Prior SEC Staff

Announcements and Observer Comments (SEC Update), which codifies recent announcements by the Securities and Exchange Commission, or SEC, staff; and ASU No. 2017-14, Income Statement—Reporting Comprehensive Income (Topic 220), Revenue Recognition (Topic 605), and Revenue from Contracts with Customers (Topic 606) (SEC Update), which adds ASC 606-10-S25-1 as a result of SEC Release 33-10403, or collectively, the Revenue ASUs.
The Revenue ASUs provide an accounting standard for a single comprehensive model for use in accounting for revenue arising from contracts with customers, and supersedes most current revenue recognition guidance. The accounting standard is effective for interim and annual periods beginning after December 15, 2017, with an option to early adopt for interim and annual periods beginning after December 15, 2016. The guidance permits two methods of adoption: retrospectively to each prior reporting period presented (the full retrospective method), or retrospectively with the cumulative effect of initially applying the guidance recognized at the date of initial application (the modified retrospective method).
We adopted the new standard effective January 1, 2018 under the modified retrospective method. During the fourth quarter of 2017, we substantially completed our assessment over the impact that this new standard will have on our consolidated balance sheets. We preliminarily expect to recognize an adjustment of approximately $30.0 million as a reduction of deferred revenue – related party with an offset to accumulated deficit on January 1, 2018 to reflect the cumulative effect of the accounting changes made upon the adoption of the standard. The finalization of our assessment may result in significant changes to our estimates that may materially impact our preliminary estimate of the cumulative effect.
Our collaboration agreements with Celgene, which are discussed in further detail within Note 8, Collaboration Agreements, are our sole source of revenue and the only arrangements impacted by the adoption of the Revenue ASUs.
Other Recent Accounting Pronouncements
In May 2017, the FASB issued ASU No. 2017-09, Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting, or ASU 2017-09, which provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in ASC 718. ASU 2017-09 is effective for us for annual periods beginning after December 15, 2017, and interim periods therein, with early adoption permitted. We are currently in the process of evaluating the impact of the guidance on our consolidated financial statements.
In October 2016, the FASB issued ASU No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory, or ASU 2016-16, which removes the prohibition in ASC 740 against the immediate recognition of the current and deferred income tax effects of intra-entity transfers of assets other than inventory. ASU 2016-16 is effective for us for annual periods beginning after December 15, 2017, and interim periods therein, with early adoption permitted. We are currently in the process of evaluating the impact of the guidance on our consolidated financial statements.
In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), or ASU 2016-02, which establishes principles that lessees and lessors shall apply to report useful information to users of financial statements about the amount, timing and uncertainty of cash flows arising from a lease. In January 2018, the FASB issued ASU 2018-01, Leases (Topic 842), or ASU 2018-01, which adds two practical expedients to the the new lease guidance. Topic 842 is effective for us for annual periods beginning after December 15, 2018 and interim periods therein, with early adoption permitted. We are currently in the process of evaluating the impact of the guidance on our consolidated financial statements.
Other accounting standards that have been issued by the FASBFinancial Accounting Standards Board or other standards-setting bodies that do not require adoption until a future date are not expected to have a material impact on our financial statements upon adoption.
F-15

Subsequent events
We considered events or transactions occurring after the balance sheet date, but prior to the issuance of the consolidated financial statements, for potential recognition or disclosure in our consolidated financial statements. All significant subsequent events have been properly disclosed in the consolidated financial statements.

Note 3. Fair Value Measurements
The following table summarizes our cash equivalents and marketable securities measured at fair value and by level (as described in Note2,Summary of Significant Accounting Policies) on a recurring basis as of December 31, 2017 (in thousands):2023:
(In thousands)Level 1Level 2Level 3Total
Cash equivalents$30,123 $— $— $30,123 
Total cash equivalents30,123 — — 30,123 
Marketable securities:
U.S. Treasuries— 35,652 — 35,652 
Government securities— 257,020 — 257,020 
Corporate debt securities— 425,486 — 425,486 
Total marketable securities— 718,158 — 718,158 
Total cash equivalents and marketable securities$30,123 $718,158 $— $748,281 
 Level 1 Level 2 Level 3 Total
Cash equivalents$33,831

$54,916

$

$88,747
Marketable securities:






Certificates of deposit

9,022



9,022
U.S. Treasuries

149,587



149,587
Government securities

68,174



68,174
Corporate debt securities

238,243



238,243

$33,831

$519,942

$

$553,773
The fair value ofThere were no transfers between Level 1 and Level 2 instruments were determined through third-party pricing services. For a description of our validation procedures related to prices provided by third-party pricing services, refer to Note 2, Summary of Significant Accounting Policies, to these consolidated financial statements. There have been no changes to the valuation methods during the years ended December 31, 2017 and 2016.
Due to the lack of an active market, we transferred $149.6 million of U.S. Treasuries and $42.6 million of government securities from Level 1 to Level 2 during the year ended December 31, 2017. Also due to the lack of an active market, we transferred $11.0 million of government securities from Level 1 to Level 2 during the year ended December 31, 2016. We had no financial assets or liabilities that were classified as Level 3 at any point during the yearsyear ended December 31, 2017 and 2016.2023.
Note 4. Marketable Securities
Marketable securities at December 31, 20172023 consisted of the following (in thousands):following:
(In thousands)Amortized
Cost
Unrealized
Gains
Unrealized
Losses
Fair
Value
Current:
U.S. Treasuries$30,876 $— $(56)$30,820 
Government securities247,460 194 (695)246,959 
Corporate debt securities411,045 874 (975)410,944 
Total Current689,381 1,068 (1,726)688,723 
Non-current:
U.S. Treasuries4,802 30 — 4,832 
Government securities9,986 75 — 10,061 
Corporate debt securities14,430 112 — 14,542 
Total Non-current29,218 217 — 29,435 
Total marketable securities$718,599 $1,285 $(1,726)$718,158 
F-16

 Amortized Cost Unrealized Gains Unrealized Losses Fair Value
Current:       
Certificates of deposit$8,081
 $
 $(11) $8,070
U.S. Treasuries113,852
 
 (119) 113,733
Government securities44,421
 
 (57) 44,364
Corporate debt securities155,222
 
 (177) 155,045
Non-current:       
Certificates of deposit960
 
 (8) 952
U.S. Treasuries36,165
 
 (311) 35,854
Government securities23,992
 
 (182) 23,810
Corporate debt securities83,722
 
 (524) 83,198
 $466,415
 $
 $(1,389) $465,026
Marketable securities at December 31, 20162022 consisted of the following (in thousands):
 
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
Current:






Certificates of deposit$11,280

$2

$(3)
$11,279
U.S. Treasuries141,678

2

(62)
141,618
Government securities19,533



(23)
19,510
Corporate debt securities208,285

3

(135)
208,153
Non-current:






Certificates of deposit7,600

6

(13)
7,593
Government securities4,499



(21)
4,478
Corporate debt securities20,248



(69)
20,179

$413,123

$13

$(326)
$412,810

following:
(In thousands)
Amortized
Cost
Unrealized
Gains
Unrealized
Losses
Fair
Value
Current:
U.S. Treasuries$68,175 $$(811)$67,367 
Government securities220,901 (5,289)215,620 
Corporate debt securities363,263 (2,391)360,873 
Total Current652,339 12 (8,491)643,860 
Non-current:
U.S. Treasuries17,418 (193)17,229 
Government securities117,475 (1,659)115,823 
Corporate debt securities183,037 76 (2,291)180,822 
Total Non-current317,930 87 (4,143)313,874 
Total marketable securities$970,269 $99 $(12,634)$957,734 
There were no material realized gains or losses on marketable securities for the years ended December 31, 20172023 and 2016.2022.
At December 31, 20172023 and 2016,2022, we held 240151 and 158259 debt securities, respectively, that were in an unrealized loss position for less than one year, respectively.year. We did not record an allowance for credit losses as of December 31, 2023 and 2022 related to these securities. The aggregate fair value of debt securities in an unrealized loss position at December 31, 20172023 and 20162022 was $439.4$513.5 million and $335.4$868.2 million, respectively. There were no individual securities that were in a significant unrealized loss position as of December 31, 20172023 and 2016.2022. We evaluated our securities for other-than-temporary impairment and considered the decline in market value forregularly review the securities to be primarily attributable toin an unrealized loss position and evaluate the current expected credit loss by considering factors such as historical experience, market data, issuer-specific factors, and current economic and market conditions. It is not more likely than not that we will be required to sell the securities, and weWe do not intend to do so prior to the recovery of the amortized cost basis. Based on this analysis,consider these marketable securities were not considered to be other-than-temporarily impaired as of December 31, 20172023 and 2016.2022.
Note 5. Property and Equipment, netInventory
Property and equipment, netInventory, which consists of the following (in thousands):
 December 31,
 2017 2016
Laboratory equipment$17,524
 $14,529
Computer equipment and software4,293
 3,204
Leasehold improvements20,322
 19,858
Furniture and fixtures752
 748
Office equipment319
 233
Construction in progress618
 137
Total property and equipment43,828
 38,709
Less: accumulated depreciation(19,397) (13,372)
Total property and equipment, net$24,431
 $25,337
Depreciation expense for the years ended December 31, 2017, 2016 and 2015 was $6.4 million, $5.7 million and $3.3 million, respectively.
6. Accrued Expenses
Accrued expenses and other current liabilities consistcommercial supply of PYRUKYND®, consisted of the following (in thousands):following:
(In thousands)December 31, 2023December 31, 2022
Raw materials$51 $— 
Work-in-process17,568 7,550 
Finished goods1,457 942 
Total inventory$19,076 $8,492 
 December 31,
 2017 2016
Accrued compensation$15,693
 $11,092
Accrued research and development costs14,849
 20,266
Accrued professional fees3,140
 476
Accrued other349
 168
Total accrued expenses$34,031
 $32,002
7. Commitments and Contingent Liabilities
Note 6. Leases
We rentOur building leases are comprised of office and laboratory and office space under non-cancelable operating leases. These lease agreements have remaining lease terms of four years and contain various clauses for renewal at our option. The renewal options were not included in the calculation of the operating lease assets and the operating lease liabilities as the renewal options are not reasonably certain of being exercised. The lease agreements do not contain residual value guarantees.
We currently lease approximately 146,000 square feet at 88 Sidney Street, 43,000 square feet at 64 Sidney Street, and 13,000 square feet at 38 Sidney Street, Cambridge, Massachusetts. All leases, as amended, expire on February 29, 2028. At the end of the initial lease period, we have the option to extend the leases at all facilities for two consecutive five-year periods at the fair market rent at the time of the extension.
The components of lease expense and escalation clauses. Rental expense under theseother information related to leases netwere as follows:
(In thousands)202320222021
Operating lease costs$15,227 $15,227 $15,229 
Cash paid for amounts included in the measurement of operating lease liabilities18,170 17,035 14,411 
We have not entered into any material short-term leases or financing leases as of tenant improvement reimbursements, amounted to $6.0 million, $6.0 million and $7.1 million for the years ended December 31, 2017, 2016 and 2015, respectively.2023.
We provided our landlord
F-17

In arriving at the operating lease liabilities as of December 31, 2023, we applied the weighted-average incremental borrowing rate of 5.7% from inception over a standby letterweighted-average remaining lease term of credit4.2 years. In arriving at the operating lease liabilities as of $2.9 million as security for our leases. We are not required to maintain any cash collateral forDecember 31, 2022, we applied the standby letterweighted-average incremental borrowing rate of credit.5.7% over a weighted-average remaining lease term of 5.2 years.

As of December 31, 2017,2023, undiscounted minimum rental commitments under non-cancelable leases, for each of the next five years and total thereafter, were as follows (in thousands):
2018$11,295
201911,770
202012,077
202112,392
202214,447
Thereafter33,891
 $95,872
In addition to rent, the leases may require us to pay additional amounts for taxes, insurance, maintenance and other operating expenses.
Program license agreements
We have entered into various cancelable license agreements for certain technology. None of our lead product candidates utilize technology covered by these licenses. Under the terms of these license agreements, we could be required to make clinical development, regulatory and sales-based milestone payments of up to $1.6 million, $5.4 million and $3.7 million, respectively, to the licensors.
The license agreements also require us to remit royalties in amounts ranging from 0.5% to 2.5% based on net sales of products utilizing the licensed technology. We are also required to make payments in amounts ranging from 7.0% to 25.0% for non-royalty income received from any sublicense of the rights granted to us under the agreements.
Milestone payment agreementsfollows:
(In thousands)
2024$17,142 
202519,506 
202620,151 
202720,755 
20283,479 
Thereafter— 
Undiscounted minimum rental commitments81,033 
Interest(9,037)
Total operating lease liabilities$71,996 
We entered into an agreement withprovided our landlord a service provider to receive discounted upfront labor costssecurity deposit of $2.9 million as security for a defined program in consideration of a milestone payment in five years from the effective date, as defined in the agreement. During the year ended December 31, 2016, we accrued a milestone payment of $4.1 million,our leases, which was paid during the year ended December 31, 2017. Nois included within other amounts are due to the service provider under the terms of the agreement.
Legal contingencies
From time to time, we may be involved in disputes and legal proceedings in the ordinary course of business. These proceedings may include allegations of infringement of intellectual property, employment or other matters. We do not have any ongoing legal proceedings that, based on our estimates, could have a material effectnon-current assets on our consolidated financial statements.balance sheet.
8. Collaboration Agreements
2016 Agreement
In May 2016,August 2021, we entered into a long-term sublease agreement for 13,000 square feet of the 2016 Agreementoffice space at 38 Sidney Street, Cambridge, Massachusetts, with Celgene, which is focused on MIO. In addition to new programs identified under the 2016 Agreement, both parties also agreed that all future development and commercialization of two remaining cancer metabolism programs discovered under the 2010 Agreement, including AG-270, our MAT2A inhibitor, will be governed by the 2016 Agreement.
During the research term of the 2016 Agreement,lease running through December 2024. In April 2022, we plan to conduct research programs focused on discovering compounds that are active against metabolic targets inentered into a long-term sublease agreement for 27,000 square feet of the immuno-oncology, or IO, field. The initial four-year researchoffice space at 64 Sidney Street, Cambridge, Massachusetts, with the term will expire on May 17, 2020, and may be extended for up to two, or in specified cases, up to four additional one-year terms.
For each program underof the 2016 Agreement, we may nominate compounds that meet specified criteria as development candidates and, in limited circumstances, Celgene may also nominate compounds as development candidates for each such program. Celgene may designate the applicable program for further development following any such nomination, after which we may conduct, at our expense, additional preclinical and clinical development for such programlease running through the completion of an initial phase 1 dose escalation study.
April 2025. At the end of the research term, Celgene may designate for continued development up to three research programs for which development candidates have yet to be nominated, which are referred to as continuation programs. We may conduct further research and preclinical and clinical development activities on any continuation program, at our expense, throughinitial sublease periods, the completion of an initial phase 1 dose escalation study.

We granted Celgene the right to obtain exclusive options for development and commercialization rights for each program that Celgene has designated for further development and for each continuation program. Celgene may exercise each such option beginning on the designation of a development candidate for such program (or on the designation of such program as a continuation program) and ending on the earlier of: (i) the end of a specified period after we have furnished Celgene with specified information about the initial phase 1 dose escalation study for such program, or (ii) January 1, 2030. Research programs that have applications in the inflammation or autoimmune, or I&I, field that may result from the 2016 Agreement will also be subject to the exclusive options described above.
We will retain rights to any program that Celgene does not designate for further development or as to which it does not exercise its option.
Under the terms of the 2016 Agreement, following Celgene’s exercise of its option with respect to a program, the parties will enter into either a co-development and co-commercialization agreement if such program is in the IO field, or a license agreement if such program is in the I&I field. Under each co-development and co-commercialization agreement, the two parties will co-develop and co-commercialize licensed products worldwide. Either we or Celgene will lead development and commercialization of licensed products for the United States, and Celgene will lead development and commercialization of licensed products outside of the United States. Depending on the country, the parties will each have the right to provide a portion of field-based marketing activities. Under each license agreement, Celgene will have the sole right to develop and commercialize licensed products worldwide.
Co-development and co-commercialization agreements
Under each co-development and co-commercialization agreement entered into under the 2016 Agreement, the parties will split all post-option exercise worldwide development costs, subject to specified exceptions, as well as any profits from any net sales of, or commercialization losses related to, licensed products in the IO field. Celgenesubtenant has the option to designate one program in the IO field as the 65/35 program, for which Celgene will be the lead party for the United States and will have a 65% profit or loss share. For programs in the IO field other than the 65/35 program, we and Celgene will alternate, on a program-by-program basis, being the lead party for the United States, with us having the right to be the lead party for the first such program, and each party will have a 50% profit or loss share. The lead party for the United States will book commercial sales of licensed products, if any, in the United States, and Celgene will book commercial sales of licensed products, if any, outside of the United States.
License agreements
Under each license agreement under the 2016 Agreement, Celgene will be responsible for all post-option exercise worldwide development and associated costs, subject to specified exceptions, as well as worldwide commercialization and associated costs, for licensed products in the I&I field.
Financial terms
Under the terms of the 2016 Agreement, we received an initial upfront payment in the amount of $200.0 million. The 2016 Agreement provides specified rights to extend the research term for up to two, or in specified cases, up to four, additional years by paying a $40.0 million per-year extension fee. Celgene will pay an $8.0 million designation fee for each program that Celgene designates for further development and for each continuation program. During the year ended December 31, 2017, we received $8.0 million from Celgene upon the designation of AG-270, our MAT2A inhibitor, as a development candidate. For each program as to which Celgene exercises its option to develop and commercialize, subject to antitrust clearance, Celgene will pay an option exercise fee of at least $30.0 million for any designated development program and at least $35.0 million for any continuation programs. In certain cases, Celgene may exercise its option to develop and commercialize two early-stage I&I programs, prior to Celgene designating the program for further development, by paying an option exercise fee of $10.0 million.

We are eligible to receive the following milestone-based payments associated with the 2016 Agreement:
ProgramMilestoneAmount
65/35 program in IO fieldSpecified clinical development event$25.0 million
65/35 program in IO fieldSpecified regulatory milestone eventsUp to $183.8 million
50/50 program in IO fieldSpecified clinical development event$20.0 million
50/50 program in IO fieldSpecified regulatory milestone eventsUp to $148.8 million
I&I fieldSpecified clinical development event$25.0 million
I&I fieldSpecified regulatory milestone eventsUp to $236.3 million
I&I fieldSpecified commercial milestone eventsUp to $125.0 million
Additionally, for each licensed program in the I&I field, we are eligible to receive royalties at tiered, low double-digit percentage rates on Celgene’s net sales, if any, of the applicable licensed products.
Opt-out right
Under the 2016 Agreement, we may elect to opt out of the cost and profit share under any co-development and co-commercialization agreement, subject to specified exceptions. Upon opting out, Celgene will have the sole right to develop, manufacture and commercialize the applicable licensed products throughout the world, at its cost, and we will undertake transitional activities reasonably necessary to transfer the development, manufacture and commercialization of such licensed products to Celgene, at our expense. Further, in lieu of the profit or loss sharing described above, we would be eligible to receive royalties at tiered, low double-digit percentage rates on Celgene’s net sales, if any, of the applicable licensed products. However, we would continue to be eligible to receive the developmental and regulatory milestone-based payments described above.
Term
The term of the 2016 Agreement commenced on May 17, 2016 and, if not terminated earlier, will expire upon the later of the last-to-expire of the research term and all option exercise periods, or, if an option is exercised by Celgeneleases for one or more programs in the collaboration, upon the termination or expiration of the last-to-exist co-development and co-commercialization agreement or license agreement, as applicable, for any such program.additional 6-month period.
Termination
Subject to specified exceptions, Celgene may terminate the 2016 Agreement in its entirety for any reason by providing us with prior written notice if there are no active co-development and co-commercialization agreements or license agreements in place or on a program-by-program basis if there are no active co-development and co-commercialization agreements or license agreements in place for the terminated program(s). Either party may terminate the 2016 Agreement for the insolvency of the other party. On a program-by-program basis, prior to the exercise of an option, either party may terminate the 2016 Agreement either in its entirety or with respect to one or more programs on prior written notice to the other party in the case of an uncured material breach by the other party that frustrates the fundamental purpose of the 2016 Agreement. Following the exercise of an option for a program, either party may terminate the 2016 Agreement with respect to such program if such party terminates the co-development and co-commercialization agreement or license agreement for such program for an uncured material breach by the other party that frustrates the fundamental purpose of such agreement. Either party may terminate a co-development and co-commercialization agreement or a license agreement upon the bankruptcy or insolvency of the other party. Either party also has the right to terminate the co-development and co-commercialization agreement or license agreement if the other party or any of its affiliates challenges the validity, scope or enforceability of or otherwise opposes, any patent included within the intellectual property rights licensed to the other party under such agreement.
Exclusivity
While any of Celgene’s options remain available under the 2016 Agreement, subject to specified exceptions, we may not directly or indirectly develop, manufacture or commercialize, outside of the 2016 Agreement, any therapeutic modality in the IO or I&I field with specified activity against a metabolic target.
During the term of each co-development and co-commercialization agreement and license agreement, subject to specified exceptions, neither we nor Celgene may directly or indirectly develop, manufacture or commercialize outside of such agreement any therapeutic modality in any field with specified activity against the metabolic target that is the focus of the program licensed under such agreement.

Ivosidenib Letter Agreement
OnIn May 17, 2016,2023, we entered into a letterlong-term sublease agreement with Celgene regarding ivosidenib, or the Ivosidenib Letter Agreement. Under the Ivosidenib Letter Agreement, the parties agreed to terminate the 2010 Agreement, effective asfor 7,407 square feet of August 15, 2016, as to the program directed to the IDH1 target, for which ivosidenib is the lead development candidate. Under the 2010 Agreement, Celgene had held development and commercialization rights to the IDH1 program outside of the United States, and we held such rights inside the United States. As a result of the Ivosidenib Letter Agreement, we obtained global rights to ivosidenib and the IDH1 program. Neither party will have any further financial obligation, including royalties or milestone payments, to the other concerning ivosidenib or the IDH1 program. Under the terms of the Ivosidenib Letter Agreement, the parties also agreed to conduct specified transitional activities in connection with the termination. In addition, pursuant to the Ivosidenib Letter Agreement, the parties are released from their exclusivity obligations under the 2010 Agreement with respect to the IDH1 program. The Ivosidenib Letter Agreement does not affect the AG-881 Agreements, which are directed to both the IDH1 target and the IDH2 target.
AG-881 Agreements
On April 27, 2015, we entered into the AG-881 Agreements. The AG-881 Agreements establish a joint worldwide collaboration focusedoffice space on the development and commercializationfirst floor of AG-881 products. Under the terms of the AG-881 Agreements, we received an initial upfront payment of $10.0 million in May 2015 and are eligible to receive milestone-based payments. The parties will split all worldwide development costs equally, subject to specified exceptions, as well as any profits from any net sales of, or commercialization losses related to, licensed AG-881 products. Either party may, at its own expense and64 Sidney Street, Cambridge, Massachusetts, with the other party's permission, undertake additional development activities outside of the scope of the development plan agreed upon with the other party.
We are eligible to receive up to $70.0 million in potential milestone payments under the AG-881 Agreements. The potential milestone payments are comprised of: (i) a $15.0 million milestone payment for filing of the first NDA in a major market, and (ii) up to $55.0 million in milestone payments upon achievement of specified regulatory milestone events. We may also receive royalties at tiered, low-double digit to mid-teen percentage rates on net sales if we elect not to participate in the development and commercialization of AG-881.
Termination
Celgene may terminate the AG-881 Agreements in their entirety for any reason upon ninety days written notice to us. Either party may terminate the AG-881 Agreements for the insolvency of the other party. Either party may terminate the AG-881 Agreements in their entirety or with respect to one of the agreements upon prior written notice to the other party in the case of an uncured material breach by the other party that frustrates the fundamental purpose of the AG-881 Agreements. If one of the AG-881 Agreements terminates, the other will terminate automatically.
2010 Agreement
In April 2010, we entered into the 2010 Agreement, which was amended in October 2011 and July 2014. The goal of the collaboration was to discover, develop and commercialize disease-altering therapies in oncology based on our cancer metabolism research platform. We initially led discovery, preclinical and early clinical development for all cancer metabolism programs under the collaboration. The discovery phase of the 2010 Agreement expired in April 2016.
Upon agreement to terminate the 2010 Agreement, effective as of August 15, 2016, as to the program directed to the IDH1 target, for which ivosidenib is the lead development candidate, the sole program remaining under the 2010 Agreement is IDHIFA®, a co-commercialized licensed program for which Celgene leads and funds global development and commercialization activities. We have exercised our right to participate in a portion of commercialization activities in the United States for IDHIFA® in accordance with the applicable commercialization plan.
Under the remaining terms of the 2010 Agreement, we are eligible to receive up to $95.0 million in potential milestone payments for the IDHIFA® program. The potential milestone payments are comprised of: (i) up to $70.0 million in milestone payments upon achievement of specified ex-U.S. regulatory milestone events, and (ii) a $25.0 million milestone payment upon achievement of a specified commercial milestone event.
Under the 2010 Agreement, we may also receive royalties at tiered, low-double digit to mid-teen percentage rates on net sales of IDHIFA®. Assuming all other revenue recognition criteria are met, royalty payments will be recognized as revenue in the period in which they are earned. During the year ended December 31, 2017, we earned $1.9 million in royalty revenue under the 2010 Agreement.
Unless terminated earlier by either party, the term of the 2010 Agreement will continue untillease running through April 2025. At the expirationend of all royalty terms with respect to IDHIFA®. Celgene may terminate this agreement for convenience in its entirety upon ninety days written notice

to us. If either party is in material breach and fails to cure such breach within the specified cureinitial sublease period, the other party may terminatesubtenant has the 2010 Agreement in its entirety. Either party may terminateoption to extend the agreement in the eventlease for one additional year, followed by a second extension option for twenty-two additional months.
We recorded operating sublease income of specified insolvency events involving the other party.
Accounting analysis$6.1 million and revenue recognition – collaboration revenue
April 2015 modification: The AG-881 Agreements were determined to be a modification of the 2010 Agreement because they govern AG-881, a compound originally identified within the 2010 Agreement.
May 2016 modification: The 2016 Agreement was determined to be a modification of the 2010 Agreement and the AG-881 Agreements because it governs compounds originally identified within the 2010 Agreement, including AG-270. All undelivered elements identified under the April 2015 modification that remained undelivered at the time of the May 2016 modification are supplanted by the undelivered elements identified under the May 2016 modification.
Upon the modifications, under the provisions of ASC 605-25, we identified the remaining deliverables under the modified arrangement, and determined the BESP$4.1 million for the undelivered elements as of the modification date. We then allocated the total arrangement consideration, which included the remaining deferred revenue balance at the modification date, any upfront payments received upon modification and other consideration under the modified arrangement that were deemed to be determinable at the modification date, to each unit of accounting relative to our BESP for each unit of accounting. The undelivered elements at the time of the modification, which are each considered by us to have stand-alone value and therefore were determined to be separate units of accounting, the related BESP, the method of recognizing the allocated consideration, and the period through which it is expected to be recognized at the time of each modification are as follows:

Undelivered
Element
 BESP Unit(s) of
Accounting
 Principal/
Agent
 Recognition
Method
July 2014 modification
Ivosidenib program license (1) 
$21.2 million 1 Principal Upon delivery of the licenses to Celgene, which occurred in January 2015
On-going development services (2) (3) 
$50.8 million 5 Principal Proportionally as services are delivered over the performance period, expected to be through June 2016
On-going research and development (2) 
$13.6 million 1 Principal Ratably over the performance period, expected to be through June 2016
Committee participations (4) 
$0.2 million 1 Principal Ratably over the performance period, expected to be through June 2016
April 2015 modification (supplants undelivered elements of July 2014 modification)
AG-881 program licenses (1) 
$33.2 million 2 Principal Upon delivery of the licenses to Celgene, which occurred immediately upon the execution of the AG-881 Agreements
On-going development services (2) (3) 
$12.7 million 4 Principal Proportionally as services are delivered over the performance period, expected to be through September 2017
On-going development services (2) (3) 
$97.3 million 4 Agent Proportionally as services are delivered over the performance period, expected to be through December 2017
On-going research and development (2) 
$30.5 million 1 Principal Ratably over the performance period, expected to be through April 2016
Committee participations (4) 
$0.8 million 1 Principal Ratably over the performance period, expected to be through December 2016
May 2016 modification (supplants undelivered elements of April 2015 modification)
On-going development services (2) (3) 
$67.8 million 3 Principal Proportionally as services are delivered over the performance period, expected to be through December 2019
On-going development services (2) (3) 
$22.4 million 3 Agent Proportionally as services are delivered over the performance period, expected to be through December 2019
On-going research and development (2) 
$207.0 million 1 Principal Ratably over the performance period, expected to be through May 2022
Committee participations (4) 
$1.5 million 1 Principal Ratably over the performance period, expected to be through December 2022
Additional development services 
$48.7 million 1 Principal Proportionally as services are delivered over the performance period, expected to begin in September 2020
(1)The BESP was developed by probability weighting multiple cash flow scenarios using the income approach. Our management estimates within the models include the expected, probability-weighted net profits from estimated future sales, an estimate of the direct cost incurred to generate future cash flows, a discount rate and other business forecast factors. There are significant judgments and estimates inherent in the determination of the BESP of these units of accounting. These judgments and estimates include assumptions regarding future operating performance, the timelines of the clinical trials and regulatory approvals, and other factors. If different reasonable assumptions are utilized, the BESP and revenue recognized would vary.
(2)The BESP was developed using our management’s best estimate of the cost of obtaining these services at arm’s length from a third-party provider.
(3)The BESP was developed using internal full time equivalent costs to support the development services.
(4)The BESP was developed using our management’s best estimate of the anticipated participation hours and the market rate for comparable participants.
The total estimated arrangement consideration, as well as the expected timing of revenue recognition, is adjusted based on changes in estimated arrangement consideration as a result of changes in estimates for on-going development services. The allocable consideration will increase as we perform certain services for which we are eligible to receive additional consideration. These amounts are recognized on a cumulative catch-up basis for any in-process units of accounting or immediately for any fully delivered units of accounting. The estimated arrangement consideration may decrease if we receive less reimbursement than initially estimated.

During the years ended December 31, 2017, 20162023 and 2015, we recognizedDecember 31, 2022, respectively, in other income, net in the consolidated statements of operations. We received a security deposit from our sublessee of approximately $1.2 million which is recorded within other non-current assets on our consolidated balance sheet.
As of December 31, 2023, the future minimum lease payments to be received under the long-term sublease agreements were as collaboration revenuefollows:
(In thousands)
20245,078 
20251,310 
Total$6,388 
Note 7. Accrued Expenses
Accrued expenses consisted of the following non-contingentat December 31:
(In thousands)20232022
Accrued compensation$23,232 $18,105 
Accrued research and development costs15,463 8,425 
Accrued professional fees3,115 2,435 
Accrued other1,357 1,385 
Total accrued expenses$43,167 $30,350 
F-18

Note 8. Product Revenue
We generate product revenue from sales of PYRUKYND® to a limited number of specialty distributors and specialty pharmacy providers, or collectively, the Customers. These Customers subsequently resell PYRUKYND® to pharmacies or dispense PYRUKYND® directly to patients. In addition to distribution agreements with Customers, we enter into arrangements with healthcare providers and payors that provide for government-mandated and/or privately-negotiated rebates, chargebacks and discounts with respect to the purchase of PYRUKYND®.
The performance obligation related to the sale of PYRUKYND® is satisfied and revenue is recognized when the Customer obtains control of the product, which occurs at a point in time, typically upon delivery to the Customer.
Product revenue, net, was as follows for the years ended December 31:
(In thousands)202320222021
Product revenue, net$26,823 $11,740 $— 
Reserves for Variable Consideration
Revenues from product sales are recorded at the net sales price, or transaction price, which includes estimates of variable consideration allocatedfor which reserves are established and result from contractual adjustments, government rebates, returns and other allowances that are offered within the contracts with our Customers, healthcare providers, payors and other indirect customers relating to the sale of our products.
The following tables summarize balances and activity in each undelivered element (in thousands):
  Years Ended December 31,
Undelivered Element 2017 2016 2015
July 2014 modification      
Ivosidenib program license $
 $
 $15,808
On-going development services (principal) 
 
 14,711
On-going research and development 
 
 4,992
Committee participations 
 
 80
April 2015 modification      
AG-881 program licenses 
 1,356
 11,968
On-going development services (principal) 
 1,656
 1,719
On-going research and development 
 4,584
 7,644
Committee participations 
 89
 121
May 2016 modification      
On-going development services (principal) 11,827
 21,308
 
On-going research and development 26,126
 14,445
 
Committee participations 167
 92
 
Total collaboration revenue - related party 
$38,120
 
$43,530
 
$57,043
Duringof the product revenue allowance and reserve categories for the years ended December 31, 2017, 2016 and 2015, we recognized as a reduction of research and development expenses the following non-contingent consideration allocated to each undelivered element (in thousands):
  Modification
Period
 Years Ended December 31,
Undelivered Element  2017 2016 2015
On-going development services (agent) April 2015 $
 $7,456
 $17,122
On-going development services (agent) May 2016 7,797
 5,662
 
Total reduction of research and development expenses   
$7,797
 
$13,118
 
$17,122
Development and commercialization expenses that were not contemplated as of the modification dates due to the high level of uncertainty are recognized as collaboration revenue or a reduction of research and development expenses in the period in which they are earned. For the years ended December 31, 2017, 2016 and 2015, we recognized the following collaboration revenue and reduction of research and development expenses related to such expenses (in thousands):
 Years Ended December 31,
 2017 2016 2015
Collaboration revenue - related party     
Development activities$
 $1,192
 $2,076
Commercial activities2,954
 170
 
Reduction of research and development expenses     
Development activities14
 6,596
 8,051

For the years ended December 31, 2017, 2016 and 2015, we recognized the following totals of collaboration revenue and reduction of research and development expenses (in thousands):
 Years Ended December 31,
 2017 2016 2015
Collaboration revenue - related party$41,074
 $44,892
 $59,119
Reduction of research and development expenses7,811
 19,714
 25,173
As of December 31, 20172023 and December 31, 2016, we recorded a collaboration2022:
(In thousands)Contractual AdjustmentsGovernment RebatesReturnsTotal
Balance at December 31, 2022$65 $573 $133 $771 
Current provisions relating to sales in the current year1,079 2,086 2,182 5,347 
Adjustments relating to prior years— (237)(77)(314)
Payments/returns relating to sales in the current year(938)(1,003)(1,958)(3,899)
Payments/returns relating to sales in the prior years(50)(335)(48)(433)
Balance at December 31, 2023$156 $1,084 $232 $1,472 
(In thousands)Contractual AdjustmentsGovernment RebatesReturnsTotal
Balance at December 31, 2021$— $— $— $— 
Current provisions relating to sales in the current year497 912 133 1,542 
Adjustments relating to prior years— — — — 
Payments/returns relating to sales in the current year(432)(339)— (771)
Payments/returns relating to sales in the prior years— — — — 
Balance at December 31, 2022$65 $573 $133 $771 

F-19

Total revenue-related reserves above, included in our consolidated balance sheets, are summarized as follows:
(In thousands)December 31, 2023December 31, 2022
Reduction of accounts receivable$151 $60 
Component of accrued expenses1,321 711 
Total revenue-related reserves$1,472 $771 
The following table presents changes in our contract assets, which consisted of accounts receivable, related partynet:
(In thousands)December 31, 2023December 31, 2022
Beginning balance$2,206 $— 
   Additions (1)
31,855 13,283 
   Deductions (1)
(31,251)(11,077)
Ending balance$2,810 $2,206 
(1) Additions to contract assets relate to amounts billed to Customers for product sales, and deductions to contract assets primarily relate to collection of $2.4 million and $4.9 million, respectively, related to reimbursable development costs.
Accounting analysis and revenue recognition – milestone revenue
In January 2016, upon the initiation of the IDHENTIFY phase 3 study of IDHIFA®, we earned and received a milestone payment of $25.0 million, which was recognized as collaboration revenuereceivables during the three months ended March 31, 2016. No milestones were earned during the years ended December 31, 2017reporting period.

Note 9. Share-Based Payments
2023 Stock Incentive Plan and 2015. The next potential milestone expected to be achieved under our collaboration agreements with Celgene is the filing of a first NDA in a country other than the U.S. Achievement of this event will result in milestone payments of $15.0 million.
Aurigene Discovery Technologies Limited
In April 2017, we entered into a new global license agreement with Aurigene Discovery Technologies Limited, or Aurigene, to research, develop and commercialize small molecule inhibitors for DHODH, or the Aurigene Agreement.
Under the terms of the Aurigene Agreement, Aurigene will provide us exclusive rights to its portfolio of novel small molecules for DHODH. Financial terms of the Aurigene Agreement include a $3.0 million upfront payment and potential future milestone payments of up to $17.0 million if we achieve certain development and regulatory milestones. The next potential milestone expected to be achieved under our collaboration agreements with Aurigene is the initiation of the first phase 1 clinical trial for DHODH. Achievement of this event will result in milestone payments owed to Aurigene of $2.0 million.
Aurigene is also eligible to receive low single-digit royalties on net product sales, if any. We will conduct preclinical studies and, if successful, fund further global research and development, as well as regulatory and commercial activities.
The term of the Aurigene Agreement will continue until the earlier of: (a) termination for convenience at our sole discretion upon 90 days prior written notice, (b) termination by either party for material breach, or (c) the expiration of the last-to-expire of all payment obligations hereunder with respect to all licensed products under the Aurigene Agreement.
Accounting analysis
The $3.0 million upfront payment was incurred in the year ended December 31, 2017 and recorded as research and development expense. Costs incurred and milestone payments due to Aurigene prior to regulatory approval are recognized as expenses in the period incurred. Payments due to Aurigene upon or subsequent to regulatory approval will be capitalized and amortized over the shorter of the remaining license or product patent life.
9. Common Stock
We are authorized to issue 125,000,000 shares of our common stock. Holders of common stock are entitled to one vote per share. Additionally, holders of common stock are entitled to receive dividends, if and when declared by our board of directors, and to share ratably in our assets legally available for distribution to our shareholders in the event of liquidation.
10. Share-Based Payments
Stock incentive plansInducement Grants
In June 2013, our Board of Directors adopted and, in July 20132023, our stockholders approved the 20132023 Stock Incentive Plan, or the 20132023 Plan. The 20132023 Plan became effective upon the closing of our initial public offering and provides for the grant of incentive stock options, non-qualifiednonstatutory stock options, stock appreciation rights, restricted stock awards, restricted stock units, or RSUs, performance-based stockshare units, or PSUs, and other stock-based awards. awards to employees, advisors, consultants and non-employee directors.
Following the adoption of the 2023 Plan, we ceased granting equity awards under the 2013 Stock Incentive Plan, or the 2013 Plan. Any outstanding equity awards that were previously granted under the 2013 Plan continue to be governed by their terms. Following adoption of the 2013 Plan, we granted no further stock options or otherceased granting equity awards under the 2007 Stock Incentive Plan, or the 2007 Plan. Any options orThere are no outstanding equity awards outstanding under the 2007 Plan atPlan.
In connection with the timestart of adoptionemployment of our Chief Executive Officer and Chief Financial Officer in 2022, and our Chief Commercial Officer in 2023, our board of directors granted each of them equity awards in the 2013 Plan remain outstandingform of stock options, RSUs and effective. PSUs, which awards were made outside our equity incentive plans as inducements material to their respective entry into employment with us in accordance with Nasdaq Listing Rule 5635(c)(4).
As of December 31, 2017,2023, the totalmaximum number of shares reserved under the 20072013 Plan, the 2023 Plan and the 2013 Plan are 7,206,938,inducement grants described above was 12,004,551, and we had 1,327,6064,989,341 shares available for future issuance under the 20132023 Plan.

F-20

Stock options
The following table summarizes the stock option activity of all stock incentive plans for the year ended December 31, 2017.
 
Number of
Stock
Options
 
Weighted-
Average
Exercise
Price
 
Weighted-
Average
Remaining
Contractual
Term
(in years)
 
Aggregate
Intrinsic
Value (in
thousands)
Outstanding at December 31, 20165,218,880
 $46.79
 7.28 $63,559
Granted1,620,652
 51.78
    
Exercised(730,478) 16.42
    
Forfeited/Expired(531,492) 74.48
    
Outstanding at December 31, 20175,577,562
 $49.58
 7.27 $94,336
Exercisable at December 31, 20172,936,068
 $44.32
 5.98 $74,229
Vested and expected to vest at December 31, 20175,577,562
 $49.58
 7.27 $94,336
2023:
Number of
Stock
Options
Weighted-
Average
Exercise
Price
Weighted-
Average
Remaining
Contractual
Term
(in years)
Aggregate
Intrinsic
Value (in
thousands)
Outstanding at December 31, 20225,772,564 $48.81 6.50$5,362 
Granted886,795 25.84 
Exercised(235,401)12.83 
Forfeited/Expired(1,160,277)56.10 
Outstanding at December 31, 20235,263,681 $44.94 6.36$423 
Exercisable at December 31, 20233,344,010 $53.55 5.02$398 
Vested and expected to vest at December 31, 20235,263,681 $44.94 6.36$423 
The weighted-average grant date fair value of options granted was $35.24, $28.41$14.32, $15.64 and $65.38$31.20 during the years ended December 31, 2017, 20162023, 2022 and 2015,2021, respectively. The total intrinsic value of options exercised was $31.5$2.9 million, $26.4$0.3 million and $50.9$8.5 million during the years ended December 31, 2017, 20162023, 2022 and 2015,2021, respectively.
At December 31, 2017,2023, the total unrecognized compensation expense related to unvested stock option awards was $85.3$27.8 million, which we expect to recognize over a weighted-average period of approximately 2.42.40 years.
Restricted stock units
We may grant awards of RSUs to non-employee directors and employees on a discretionary basis pursuant to the 2013 Plan. EachUpon vesting, each RSU entitles the holder to receive at the end of each vesting period, a specified number of shares of our common stock.
The following table presents RSU activity for the year ended December 31, 2017:
 Number of
Stock Units
 Weighted-Average
Grant Date
Fair Value
Unvested shares at December 31, 201677,050
 $49.60
Granted66,334
 52.23
Vested(7,500) 122.22
Forfeited(10,300) 39.76
Unvested shares at December 31, 2017125,584
 $47.46
2023:
Number of
Stock Units
Weighted-Average
Grant Date
Fair Value
Unvested shares at December 31, 20221,117,921 $38.30 
Granted914,943 25.93 
Vested(464,881)41.36 
Forfeited(221,282)33.25 
Unvested shares at December 31, 20231,346,701 $29.67 
As of December 31, 2017,2023, there was approximately $2.4$22.6 million of total unrecognized compensation expense related to RSUs, which we expect to be recognized over a weighted-average period of 1.21.75 years.
Performance-based stock optionsunits
DuringAt the years ended December 31, 2017, 2016 and 2015, no options to purchase sharesachievement of common stock that contain performance-based or a combination ofthe performance-based and service-based vesting criteria, were granted by us. However, certain performance-based stock options issued in prior periods were still outstanding aseach PSU entitles the holder to receive a specified number of shares of our common stock. The following table presents PSU activity for the year ended December 31, 2017. Performance-based2023:
Number of
Stock Units
Weighted-Average
Grant Date
Fair Value
Unvested shares at December 31, 2022430,243 $35.87 
Granted125,897 25.23 
Vested(92,257)30.18 
Forfeited(101,750)46.39 
Unvested shares at December 31, 2023362,133 $30.66 
Included in unvested shares were 145,023 shares with performance-based vesting criteria for options primarily relate to milestone events specific to our corporate goals, including but not limited to certain preclinical, clinicalthat were considered probable of achievement at December 31, 2023 and regulatory development milestones related to our product candidates.vested in January 2024. Stock-based compensation expense associated with these performance-based stock optionsPSUs is recognized if the underlying performance condition is considered probable of achievement using our management’s best estimates. As of December 31, 2017, all performance-based milestones had been achieved and all2023, there was no unrecognized compensation expense related to these options has been recorded.PSUs with performance-

F-21

Performance-based stock units
We may grant awards of PSUs to non-employee directors and employees on a discretionary basis pursuant to the 2013 Plan. Each PSU entitles the holder to receive, at the achievement of the performance-based and service-basedbased vesting criteria a specified number of shares of our common stock. Performance-based vesting criteria primarily relate to milestone events specific to our corporate goals, specifically regulatory milestones related to our product candidates.
The following table presents PSU activity for the year ended December 31, 2017:
 Number of
Stock Units
 Weighted-Average
Grant Date
Fair Value
Unvested shares at December 31, 2016200,613
 $53.36
Granted18,667
 52.75
Vested
 
Forfeited(43,094) 54.63
Unvested shares at December 31, 2017176,186
 $52.98
Stock-based compensation expense associated with these PSUs is recognized if the performance condition isthat are considered probable of achievement using our management’s best estimates. As of December 31, 2017, there was approximately $9.3that we expect to recognize. There is $5.9 million of total unrecognized compensation expense related to PSUs with performance-based vesting criteria that are considered not considered probable of achievement.
Market-based stock units
We have issued certain equity awards that contain market based vesting conditions, in which shares of stock are earned at vesting based on stock price performance. The fair value of MSUs are estimated using a Monte Carlo simulation model. Assumptions and estimates utilized in the model include the risk-free interest rate, dividend yield, expected stock volatility and the estimated period to achievement of the market condition.
The following table presents MSU activity for the year ended December 31, 2023:
Number of
Stock Units
Weighted-Average
Grant Date
Fair Value
Unvested shares at December 31, 202242,695 $41.50 
Granted— — 
Unvested shares at December 31, 202342,695 $41.50 
As of December 31, 2023, there was no remaining unrecognized compensation expense related to MSUs.
2013 Employee Stock Purchase Plan
In June 2013, our Board of Directors adopted, and in July 2013 our stockholders approved, the 2013 Employee Stock Purchase Plan, or the 2013 ESPP. The 2013 ESPP is administered by our Board of Directors or by a committee appointed by our Board of Directors. UnderOn January 1, 2023, the annual increase for the 2013 ESPP each offering period is six months, at the end of which employees may purchaseresulted in an additional 509,091 shares of common stock through payroll deductions made over the term of the offering period. The per-share purchase price at the end of each offering period is equal to 85% of the closing price of one share of our common stock at the beginning or end of the offering period, whichever is lower, subject to Internal Revenue Service, or IRS, limits.authorized for issuance. We issued 59,651112,832 shares and 36,680104,867 shares during the years ended December 31, 20172023 and 2016,2022, respectively, under the 2013 ESPP. The 2013 ESPP provides participating employees with the opportunity to purchase up to an aggregate of 327,2722,363,636 shares of our common stock. As of December 31, 2017,2023, we had 213,7911,686,039 shares available for future issuance under the 2013 ESPP.
Stock-based compensation expense
During the years ended December 31, 2017, 20162023, 2022 and 2015,2021, we recorded stock-based compensation expense for employee and non-employee stock options, RSUs, performance-based stock optionsPSUs, and ESPP shares. Stock-based compensation expense by award type included within the consolidated statements of operations is as follows (in thousands):follows:
(In thousands)202320222021
Stock options$17,163 $23,731 $30,985 
Restricted stock units19,367 21,670 21,510 
Performance-based stock units7,368 2,919 — 
Employee Stock Purchase Plan868 976 1,013 
Total stock-based compensation expense$44,766 $49,296 $53,508 
 Years Ended December 31,
 2017 2016 2015
Stock options$43,997
 $39,305
 $30,331
Restricted stock units2,858
 1,964
 902
Performance-based stock options
 46
 341
Employee Stock Purchase Plan954
 771
 389
Total stock-based compensation expense$47,809
 $42,086
 $31,963


Expenses related to equity-based awards were allocated as follows in the consolidated statements of operations (in thousands):
 Years Ended December 31,
 2017 2016 2015
Research and development expense$30,807
 $25,386
 $17,419
General and administrative expense17,002
 16,700
 14,544
 $47,809
 $42,086
 $31,963
operations:
(In thousands)202320222021
Research and development expense$17,064 $20,988 $24,527 
Selling, general and administrative expense27,702 28,308 28,981 
Total stock-based compensation expense$44,766 $49,296 $53,508 
No related tax benefits were recognized for the years ended December 31, 2017, 20162023, 2022 and 2015.2021.
F-22

The fair value of each stock option granted to employees and non-employees is estimated on the date of grant using the Black-Scholes option-pricing model. For non-employees, the fair value of each stock option is estimated on each vesting and reporting date using the Black-Scholes option-pricing model. The following table summarizes the weighted average assumptions used in calculating the grant date fair value of the awards:
Years Ending December 31,
2017 2016 2015
2023202320222021
Risk-free interest rate2.05% 1.42% 1.71%Risk-free interest rate4.05 %2.55 %0.72 %
Expected dividend yield
 
 
Expected term (in years)6.05
 6.05
 6.04
Expected term (in years)5.996.036.05
Expected volatility77.73% 72.84% 69.62%Expected volatility54.26 %55.30 %61.72 %
Expected term
We use the “simplified method” as prescribed by the Securities and Exchange Commission Staff Accounting Bulletin No. 107, Share Based Payments, to estimate the expected term of stock option grants. Under this approach, the weighted-average expected life is presumed to be the average of the contractual term of ten years and the weighted-average vesting term of the our stock options, taking into consideration multiple vesting tranches. We utilize this method due to lack of historical data and the plain-vanilla nature of our share-based awards.
Volatility
We use a weighted-average of expected volatility based on the volatilities of a representative group of publicly traded biopharmaceutical companies, including ourselves. The expected volatility has been determined using a weighted-average of theour historical volatilities of the representative group of companies for a period equal to the expected term of the option grant.
Risk-free rate
The risk-free rate is based on the yield curve of U.S. Treasury securities with periods commensurate with the expected term of the options being valued.
Dividends
We have never paid, and do not anticipate paying, any cash dividends in the foreseeable future, and, therefore, use an expected dividend yield of zero in the option-pricing model.
Forfeitures
Upon adoption of ASU 2016-09, we elected toWe account for forfeitures as they occur and, therefore, do not estimate forfeitures.
Note 10. Net Income (Loss) per Share
Basic net income (loss) per share is calculated by dividing net income (loss) by the weighted-average shares outstanding during the period, without consideration for common stock equivalents. Diluted net income (loss) per share is calculated by adjusting the weighted-average shares outstanding for the dilutive effect of common stock equivalents outstanding for the period, determined using the treasury stock method. For purposes of the dilutive net income (loss) per share calculation, stock options, RSUs, PSUs and MSUs for which the performance and market vesting conditions, respectively, have been deemed probable, and 2013 ESPP shares are considered to be common stock equivalents, while PSUs and MSUs with performance and market vesting conditions, respectively, that were not deemed probable as of December 31, 2023 are not considered to be common stock equivalents.
We utilize the control number concept in the computation of diluted earnings per share to determine whether potential common stock equivalents are dilutive. The control number used is net loss from continuing operations. The control number concept requires that the same number of potentially dilutive securities applied in computing diluted earnings per share from continuing operations be applied to all other categories of income or loss, regardless of their anti-dilutive effect on such categories. Since we had a net loss from continuing operations for all periods presented, no dilutive effect has been recognized in the calculation of income (loss) from discontinued operations per share or net income (loss) per share. Basic and diluted net income (loss) per share was the same for all periods presented.
F-23

The following common stock equivalents were excluded from the calculation of diluted net loss per share applicable to common stockholders for the periods indicated because including them would have had an anti-dilutive effect:
Years ended December 31,
202320222021
Stock options5,263,681 5,772,564 4,798,826 
Restricted stock units1,346,701 1,117,921 1,002,924 
Performance-based stock units145,023 — — 
Employee Stock Purchase Plan shares48,713 42,026 39,864 
Total6,804,118 6,932,511 5,841,614 
Note 11. Income Taxes
The domestic and foreign components of loss from continuing operations before income taxes are as follows (in thousands):
 Years Ended December 31,
 2017 2016 2015
Domestic$(290,423) $(179,896) $(111,057)
Foreign(24,247) (18,575) (6,674)
Total$(314,670) $(198,471) $(117,731)

follows:
(In thousands)202320222021
Domestic$(352,085)$(231,767)$(356,665)
Foreign(3)(34)155 
Total$(352,088)$(231,801)$(356,510)
We did not have any provision for income taxes for the years ended December 31, 2017, 20162023, 2022 and 2015.2021.
A reconciliation of the expected income tax benefit (expense) computed using the federal statutory income tax rate to our effective income tax rate is as follows for the years ended December 31, 2017, 20162023, 2022 and 2015:2021:
202320222021
Income tax benefit computed at federal statutory tax rate21.0 %21.0 %21.0 %
State taxes, net of federal benefit1.9 %2.9 %2.6 %
Change in valuation allowance(23.8)%(25.7)%(24.5)%
General business credits and other credits4.2 %5.2 %5.3 %
Permanent differences and other adjustments(2.8)%(2.3)%(3.9)%
Stock based compensation(0.5)%(1.1)%(0.5)%
Total— %— %— %
F-24

 Years Ended December 31,
 2017 2016 2015
Income tax benefit computed at federal statutory tax rate35.0 % 35.0 % 35.0 %
State taxes, net of federal benefit4.0 % 2.9 % 4.5 %
Change in valuation allowance(19.4)% (43.4)% (44.6)%
General business credits and other credits10.4 % 9.5 % 8.4 %
Permanent differences and other adjustments % (0.3)% (0.3)%
Incentive stock options0.3 % (1.8)% (1.8)%
Foreign rate differential(1.6)% (1.9)% (1.2)%
Impact of federal rate change(28.7)%  %  %
Total %  %  %
Deferred income taxes reflect the net tax effects of temporary differences between the carrying amount of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of our deferred tax assets and liabilities for the years ended December 31, 20172023 and 20162022 are as follows (in thousands):follows:
(In thousands)20232022
Deferred tax assets:
Net operating loss carryforwards$64,066 $32,907 
Tax credit carryforwards180,635 163,780 
Purchased intangible assets14,155 11,583 
Stock-based compensation20,954 26,236 
Operating lease liability16,780 21,042 
Non-deductible accruals and reserves, including inventory5,134 3,992 
Section 174 R&D expense93,333 56,565 
Total deferred tax assets395,057 316,105 
Depreciation and amortization(1,986)(3,767)
Operating lease right of use asset(13,411)(16,345)
Less: valuation allowance(379,660)(295,993)
Net deferred taxes$— $— 
 December 31,
 2017 2016
Deferred tax assets:   
Net operating loss carryforwards$131,165
 $126,077
Deferred revenue41,243
 8,051
Tax credit carryforwards100,791
 43,350
Purchased intangible assets3,906
 4,410
Stock-based compensation20,539
 22,731
Deferred rent5,042
 8,516
Non-deductible accruals and reserves3,778
 3,310
Total deferred tax assets306,464
 216,445
Depreciation and amortization$(4,549) $(8,412)
Less: valuation allowance(301,915) (208,033)
Net deferred taxes$
 $
In December 2017, theThe Tax Cuts and Jobs Act or TCJA, was signed into law. Among other things, the TCJA permanently lowers the corporate federal income tax rate(TCJA) requires taxpayers to 21% from the existing maximum rate of 35%, effectivecapitalize and amortize research and experimental expenditures under Internal Revenue Code section 174 for tax years including or commencing January 1, 2018. As a resultbeginning after December 31, 2021. The Company capitalized research and experimental costs of $232.7 million and $261.4 million for the reduction ofyears ended December 31, 2023 and December 31, 2022, respectively. We will amortize these costs for tax purposes over 5 years if the corporate federal income tax rate to 21%, U.S. GAAP requires companies to revalue their deferred tax assetsresearch and deferred tax liabilities as of the date of enactment, with the resulting tax effects accounted forexperimentation was performed in the reporting period of enactment. This revaluation resulted in a provision of $90.0 million to income tax expense in continuing operationsU.S. and a corresponding reduction inover 15 years if the valuation allowance. As a result, thereresearch and experimentation was no impact on our consolidated statements of operations fromperformed outside the reduction in tax rate. The other provisions of the TCJA did not have a material impact on the consolidated financial statements.
Our preliminary estimate of the TCJA and the remeasurement of our deferred tax assets and liabilities is subject to the finalization of management’s analysis related to certain matters, such as developing interpretations of the provisions of the TCJA, changes to certain estimates and the filing of our tax returns. U.S. Treasury regulations, administrative interpretations or court decisions interpreting the TJCA may require further adjustments and changes in our estimates.
The final determination of the TCJA and the remeasurement of our deferred assets and liabilities will be completed as additional information becomes available, but no later than one year from the enactment of the TCJA.
As of December 31, 2017,2023, we had net operating loss carryforwards, or NOLs, available to reduce federal, state and foreign income taxes of approximately $454.6$131.7 million, $456.7$502.4 million and $46.2$65.2 million, respectively. If not utilized, these NOLs begin to expire in 2033, 2032 and 2022, respectively. At December 31, 2017,2023, we also had available research and development tax

credits for federal and state income tax purposes of approximately $18.5$25.5 million and $8.5$28.1 million, respectively. If not utilized, the credits begin to expire in 20272039 and 20202027 for federal and state income tax purposes, respectively. We engaged in clinical testing activities and incurred expenses that qualify for the federal orphan drug tax credit. At December 31, 2017,2023, we had available orphan drug tax credits for federal purposes only of approximately $75.6$132.9 million. If not utilized, the orphan drug credits begin to expire in 2035.
We adopted ASU 2016-09 during the quarter ended March 31, 2017. As a result of the adoption, the net operating losses deferred tax assets increased by $32.7 million and were offset by a corresponding increase in the valuation allowance. The adoption of ASU 2016-09 had no impact on our consolidated balance sheets or consolidated statements of operations.
As provided by Section 382 of the Internal Revenue Code of 1986, or Section 382, and similar state provisions, utilization of NOLs and tax credit carryforwards may be subject to substantial annual limitations due to ownership change limitations that have previously occurred or that could occur in the future. Ownership changes may limit the amount of NOLs and tax credit carryforwards that can be utilized annually to offset future taxable income and tax, respectively. In general, an ownership change, as defined by Section 382, results from transactions that increase the ownership of five percent stockholders in the stock of a corporation by more than 50 percent in the aggregate over a three year period. During the year endedWe completed a review of our changes in ownership through December 31, 2017, we completed a Section 382 study to determine whether any ownership change has occurred since our formation2023 and determined that transactions have resulted in twono ownership changes during the year ended December 31, 2023, as defined by Section 382. The impact of the historical ownership changes has been reflected in our deferred tax assets in the table above. There could be additional ownership changes after December 31, 2017 that could further limit the amount of NOLs and tax credit carryforwards that we can utilize.
As required by ASC 740, we have evaluated the positive and negative evidence bearing upon the realizability of our deferred tax assets. Based on the weight of available evidence, both positive and negative, we recorded a valuation allowance of $301.9$379.7 million and $208.0$296.0 million as of December 31, 20172023 and December 31, 2016,2022, respectively, because we have determined that it is more likely than not that these assets will not be fully realized. The valuation allowance increased by $93.9$83.7 million $86.1for the year ended December 31, 2023 and by $59.5 million and $52.5 millionfor the year ended December 31, 2022 primarily due to the Section 174 R&D expense capitalization.
F-25

The following table presents our change in valuation allowance for the years ended December 31, 2017, 20162023 and, 2015, respectively.2022:
(In thousands)20232022
Valuation allowance at the beginning of the year$295,993 $236,478 
Increase (decrease) for the current period83,667 59,515 
Valuation allowance at the end of the year$379,660 $295,993 
As of December 31, 2023, the unremitted earnings of our foreign subsidiaries are not material. We have not provided for U.S. income taxes or foreign withholding taxes on these earnings as it is our current intention to permanently reinvest these earnings outside the U.S. The tax liability on these earnings is also not material. Events that could trigger a tax liability include, but are not limited to, distributions, reorganizations or restructurings and/or tax law changes.
We apply the accounting guidance in ASC 740 related to accounting for uncertainty in income taxes. Our reserves related to taxes are based on a determination of whether, and how much of, a tax benefit taken by us in our tax filings or positions is more likely than not to be realized following resolution of any potential contingencies present related to the tax benefit.
The following table presents our unrecognized tax benefits activity for the years ended December 31, 20172023 and 2016 (in thousands):
2022:
 December 31,
 2017 2016
Unrecognized tax benefits at 12/31/2016$
 $
Gross increases - current period tax positions11,263
 
Unrecognized tax benefits at 12/31/201711,263
 
(In thousands)20232022
Unrecognized tax benefits at the beginning of the year$26,190 $24,220 
Gross increases - current period tax positions2,388 1,970 
Unrecognized tax benefits at the end of the year$28,578 $26,190 
We will recognize interest and penalties related to uncertain tax positions above the line as an expense to continuing operations. As of December 31, 2023 and 2022, we had no accrued interest or penalties related to uncertain tax positions and no such amounts have been recognized. If all of the Company’s unrecognized tax benefits as of December 31, 2023 were to become recognizable in the future, we would record $28.6 million of unrecognized tax benefits. The uncertain tax position does not impact our effective income tax rate due to the full valuation allowance.
We are subject to taxation in the United States, Switzerland, Netherlands, Germany, Italy and Switzerland.France. The statute of limitations for assessment by the IRS and state tax authorities is open for tax years ending December 31, 2017, 2016, 2015,2023, 2022, 2021, and 2014,2020, although carryforward attributes that were generated for tax years prior to 20142020 may still be adjusted upon examination by the IRS or state tax authorities if they either have been, or will be, used in a future period. The statute of limitations for assessment in Switzerland remains open for tax yearyears ending December 31, 2017, 2016,2023, 2022, 2021, 2020 and 2015.2019. The Company’s subsidiaries in the Netherlands and Germany were incorporated in 2019 and have statute of limitations for 5 and 4 years, respectively, for assessment. The tax years that remain open in these jurisdictions are for the tax years ending December 31, 2023, 2022, 2021, 2020 and 2019. The Company’s subsidiaries in Italy and France were incorporated in 2020 and have statute of limitations for 5 and 3 years, respectively, for assessment. The tax years that remain open in these jurisdictions are for the tax years ending December 31, 2023, 2022, 2021 and 2020. There are currently no federal, state or foreign audits in progress.
As of December 31, 2023 and 2022, we had an income tax receivable of $1.1 million and $0.3 million, respectively, recorded within prepaid expenses and other current assets.
F-26

Note 12. Property and Equipment, net
Property and equipment, net consisted of the following at December 31:
(In thousands)20232022
Laboratory equipment$17,433 $23,182 
Computer equipment and software6,566 6,179 
Leasehold improvements37,277 37,277 
Furniture and fixtures3,459 3,514 
Office equipment2,268 2,248 
Construction in progress608 657 
Total property and equipment67,611 73,057 
Less: accumulated depreciation(52,229)(50,070)
Total property and equipment, net$15,382 $22,987 
Depreciation expense for the years ended December 31, 2023, 2022 and 2021 was $6.6 million, $8.4 million and $8.8 million, respectively.
Note 13. Common Stock
We are authorized to issue 125,000,000 shares of our common stock. Holders of common stock are entitled to one vote per share. Additionally, holders of common stock are entitled to receive dividends, if and when declared by our board of directors, and to share ratably in our assets legally available for distribution to our shareholders in the event of liquidation.
Note 14. Share Repurchase Program
On March 25, 2021, we announced that our board of directors authorized a repurchase program, or the Repurchase Program, for the repurchase of up to $1.2 billion of our outstanding shares of common stock. On March 31, 2021, in connection with the Repurchase Program, we entered into a definitive share repurchase agreement with BMS to repurchase 7.1 million shares of our common stock held by certain subsidiaries of BMS for an aggregate purchase price of $344.5 million, or $48.38 per share. This repurchase was completed on April 5, 2021.
Further, on April 2, 2021, in connection with the Repurchase Program, we entered into a Rule 10b5-1 repurchase plan to which we may repurchase up to $600.0 million of shares of our common stock. As of December 31, 2023, we repurchased approximately 9.1 million shares of common stock for $458.0 million, or $50.35 per share, under the Rule 10b5-1 repurchase plan. In total, as of December 31, 2023, we repurchased 16.2 million shares of common stock for $802.5 million, or $49.49 per share, under the Repurchase Program. No common stock was purchased during the years ended December 31, 2023 or December 31, 2022.
On October 5, 2021, we terminated our Rule 10b5-1 share repurchase plan and on October 13, 2021, we entered into a Rule 10b-18 repurchase plan that allows us to conduct open market repurchases over time up to our remaining authorization under the Repurchase Program. We have paused our share repurchases for the foreseeable future.
Repurchased shares are held as treasury stock until they are retired or re-issued. Treasury stock purchases are accounted for under the cost method whereby the entire cost of the acquired stock is recorded as treasury stock. Repurchases of our common stock are accounted for as of the settlement date. There were no retirements or re-issuances of treasury stock during the year ended December 31, 2023.
Note 15. Discontinued Operations
On March 31, 2021, we completed the sale of our oncology business to Servier. We determined the sale of the oncology business represented a strategic shift that had a major effect on our business and therefore met the criteria for classification as discontinued operations at March 31, 2021. Accordingly, the oncology business was reported as discontinued operations in accordance with ASC 205-20, Discontinued Operations. The results of operations from the oncology business were classified as discontinued operations in the consolidated statements of operations. We recognized a gain on the sale of the oncology business upon closing.
F-27

The following table presents the gain on the sale for the year ended December 31, 2021:
(in thousands)December 31, 2021
Cash proceeds$1,802,936 
Less: transaction and insurance costs(53,573)
Plus: net liabilities distributed, including working capital adjustment239,770 
Gain on sale, pre-tax1,989,133 
Income tax expense(12,799)
Gain on sale, net of tax$1,976,334 
As of December 31, 2023 and December 31, 2022, there were no assets or liabilities classified as discontinued operations.

The following table presents the financial results of the discontinued operations:
(in thousands)2021
Revenues:
Product revenue, net$36,909 
Collaboration revenue – related party1,350 
Collaboration revenue – other491 
Royalty revenue – related party2,659 
Total revenue41,409 
Cost and expenses:
Cost of sales706 
Research and development41,564 
Selling, general and administrative8,551 
Total cost and expenses50,821 
(Loss) income from discontinued operations(9,412)
Non-cash interest expense for the sale of future revenue(5,697)
Gain on the sale of the oncology business1,989,133 
Income from discontinued operations, pre-tax1,974,024 
Income tax expense(12,799)
Net income from discontinued operations$1,961,225 
In accordance with ASC 205-20, only expenses specifically identifiable and related to a business to be disposed may be presented in discontinued operations. As such, the research and development, marketing, selling and general and administrative expenses in discontinued operations include corporate costs incurred directly to solely support our oncology business.
We also entered into a Transition Services Agreement with Servier, through which we provided transitional services related to discovery, clinical development, technical operations, commercial and general and administrative related activities through March 31, 2022.
The milestone payment for approval of vorasidenib and royalty payments related to vorasidenib and TIBSOVO® represent contingent consideration. Contingent consideration has been accounted for as a gain contingency in accordance with ASC 450, Contingencies, and will be recognized in earnings in the period when realizable. As described in Note 1, Nature of Business, on October 27, 2022, we sold our rights to future contingent payments related to TIBSOVO® royalties to entities affiliated with Sagard and recognized income of $127.9 million within the gain on sale of contingent payments line item in our consolidated statements of operations for the year ended December 31, 2022.
F-28


Note 16. Commitments and Contingent Liabilities
Manufacturing Commitments
We are party to various agreements with contract manufacturing organizations that we are not contractually able to terminate for convenience and avoid any and all future obligations to the vendors. Under such agreements, we are obligated to make certain minimum payments, with the exact amounts in the event of termination to be based on the timing of the termination and the exact terms of the agreement.
Legal Contingencies
From time to time, we may be involved in disputes and legal proceedings in the ordinary course of business. These proceedings may include allegations of infringement of intellectual property, employment or other matters. We do not have any ongoing legal proceedings that, based on our estimates, could have a material effect on our consolidated financial statements.
Note 17. Defined Contribution Benefit Plan
We sponsor a 401(k) retirement plan, in which substantially all of our full-time employees are eligible to participate. Participants may contribute a percentage of their annual compensation to this plan, subject to statutory limitations. We will make matching contributions equal to 50%100% of the employee’s contributions, subject to a maximum of 6%4% of eligible compensation.


13. Net Loss per Share
Since we had a net loss for all periods presented, the effect of all potentially dilutive securities is anti-dilutive. Accordingly, basic and diluted net loss per share was the same for the years ended December 31, 2017, 2016 and 2015. Furthermore, 176,186 PSUs that were previously granted had not vested as of December 31, 2017 and were excluded from diluted shares outstanding as the vesting conditions for the awards, discussed further in Note 10, Share-Based Payments, had not been met as of December 31, 2017.
The following common stock equivalents were excluded from the calculation of diluted net loss per share applicable to common stockholders for the periods indicated because including them would have had an anti-dilutive effect:
F-29
 Years ended December 31,
 2017 2016 2015
Stock options5,577,562
 5,218,880
 4,618,697
Restricted stock units125,584
 77,050
 15,000
Unvested restricted stock
 
 
Employee stock purchase plan shares22,062
 24,018
 7,721

5,725,208
 5,319,948
 4,641,418
14. Selected Quarterly Financial Data (Unaudited)
The following table contains quarterly financial information for 2017 and 2016 (in thousands, except per share data):
2017 First
Quarter
 Second
Quarter
 Third
Quarter
 Fourth
Quarter
Total revenue $10,508
 $11,346
 $11,358
 $9,799
Loss from operations (67,047) (84,600) (79,017) (90,130)
Net loss (66,166) (83,082) (77,137) (88,285)
Net loss per share – basic and diluted (1.56) (1.78) (1.59) (1.81)
         
2016 First
Quarter
 Second
Quarter
 Third
Quarter
 Fourth
Quarter
Total revenue $31,281
 $6,978
 $8,985
 $22,648
Loss from operations (23,594) (56,470) (63,512) (57,409)
Net loss (23,198) (55,953) (62,834) (56,486)
Net loss per share – basic and diluted (0.61) (1.47) (1.63) (1.34)


F-32