Agios Pharmaceuticals, Inc., a leader in the field of cellular metabolism to treat cancer and rare genetic diseases, today announced the U.S. Food and Drug Administration (FDA) approved a supplemental New Drug Application (sNDA) to update the U.S. Prescribing Information for Tibsovo, an isocitrate dehydrogenase-1 (IDH1) inhibitor, to include adult patients with newly diagnosed acute myeloid leukemia (AML) with a susceptible IDH1 mutation as detected by an FDA-approved test who are ≥ 75 years old or who have comorbidities that preclude use of intensive induction chemotherapy. The sNDA was granted Priority Review and accepted under the FDA's Real-Time Oncology Review pilot program, which aims to make the review of oncology drugs more efficient by allowing the FDA access to clinical trial data before the information is formally submitted to the agency. Tibsovo received initial FDA approval in July 2018 for adult patients with relapsed or refractory (R/R) AML and an IDH1 mutation1.

"Despite several new AML medicines approved in the last two years, many newly diagnosed patients are still not eligible for existing therapies or combination regimens because of age and other comorbidities," said Chris Bowden, M.D., chief medical officer at Agios. "With today’s additional Tibsovo approval, we are now able to provide a targeted, oral therapy to patients with an IDH1 mutation who may not have other treatment options. In addition, we are continuing our work to expand the utility of Tibsovo in newly diagnosed AML patients in ongoing Phase 3 trials in combination with both intensive chemotherapy and azacitidine. I would like to thank the patients, nurses, physicians and caregivers who participated in the clinical trial, as well as the tremendous employees at Agios whose focus on patients made this possible."

AML is a cancer of the blood and bone marrow marked by rapid disease progression and is the most common acute leukemia affecting adults with approximately 20,000 new cases estimated in the U.S. each year2,3. AML patients are typically older or have comorbidities that preclude the use of intensive chemotherapy4. These patients typically have a worse prognosis and poor outcomes5. The majority of patients with AML eventually relapse6. The five-year survival rate is approximately 28%2. For 6 to 10 percent of AML patients, the mutated IDH1 enzyme blocks normal blood stem cell differentiation, contributing to the genesis of acute leukemia7. IDH1 mutations have been associated with negative prognosis in AML8,9.

"The Phase 1 results for Tibsovo demonstrated that this oral, single agent therapy can induce durable responses in newly diagnosed AML patients with an IDH1 mutation," said Gail J. Roboz, M.D., Professor of Medicine, Director of the Leukemia Program and a member of the Sandra and Edward Meyer Cancer Center at Weill Cornell Medicine and NewYork-Presbyterian/Weill Cornell Medical Center*. "Many patients included in the study had features associated with particularly aggressive and challenging forms of AML, including secondary disease, adverse risk genetics and prior treatment with hypomethylating agents."

Tibsovo Safety and Efficacy Data

The efficacy of Tibsovo was evaluated in an open-label, single-arm, multicenter clinical trial (Study AG120-C-001, NCT02074839) that included 28 adult patients with newly diagnosed AML with an IDH1 mutation who were assigned to receive a 500 mg daily dose. The cohort included patients who were age 75 or older or had comorbidities that precluded the use of intensive induction chemotherapy (baseline Eastern Cooperative Oncology Group [ECOG] performance status of ≥2, severe cardiac or pulmonary disease, hepatic impairment with bilirubin >1.5 times the upper limit of normal, or creatinine clearance <45 mL/min). Patients had a median age of 77 years (range of 64 to 87) and 68% had AML with myelodysplasia-related changes. The primary endpoint is the combined complete remission (CR) and complete remission with partial hematologic improvement (CRh) rate. CRh is defined as <5% of blasts in the bone marrow, no evidence of disease and partial recovery of peripheral blood counts (platelets >50,000/microliter and ANC >500/microliter).

In this trial, Tibsovo demonstrated:

CR+CRh rate of 42.9% (12 of 28 patients) (95% CI: 24.5, 62.8).

The CR rate was 28.6% (8 of 28 patients) (95% CI 13.2, 48.7) and the CRh rate was 14.3% (4 of 28 patients) (95% CI 4.0, 32.7).

Median durations of CR and CR+CRh were not estimable, with 5 patients (41.7%) who achieved CR or CRh remaining on Tibsovo treatment (treatment duration range: 20.3 to 40.9 months) as of the data cutoff.

58.3% (7 of 12) of patients who achieved CR or CRh were in remission at 1 year after receiving treatment.

For patients who achieved a CR or CRh, the median time to best response of CR or CRh was 2.8 months (range, 1.9 to 12.9 months).

Among the 17 patients who were dependent on red blood cell (RBC) and/or platelet transfusions at baseline, 7 (41.2%) became independent of RBC and platelet transfusions during any 56-day post-baseline period.

Of the 11 patients who were independent of both RBC and platelet transfusions at baseline, 6 (54.5%) remained transfusion independent during any 56-day post-baseline period.

The safety profile of single-agent Tibsovo was evaluated in 28 patients with newly diagnosed AML with an IDH1 mutation treated with a dose of 500 mg daily. The median duration of exposure to Tibsovo was 4.3 months (range, 0.3 to 40.9 months). In the clinical trial, 25% (7 of 28) of patients treated with Tibsovo experienced differentiation syndrome, which can be fatal if not treated. Of the 7 patients with newly diagnosed AML who experienced differentiation syndrome, 6 (86%) patients recovered. QTc interval prolongation occurred in patients treated with Tibsovo. The most common adverse reactions (≥20%) of any grade in patients with newly diagnosed AML were diarrhea, fatigue, decreased appetite, edema, nausea, leukocytosis, arthralgia, abdominal pain, dyspnea, myalgia, constipation, differentiation syndrome, dizziness, electrocardiogram QT prolonged, mucositis and vomiting.

About Tibsovo (ivosidenib)

Tibsovo is indicated for the treatment of acute myeloid leukemia (AML) with a susceptible isocitrate dehydrogenase-1 (IDH1) mutation as detected by an FDA-approved test in:

Adult patients with newly-diagnosed AML who are ≥75 years old or who have comorbidities that preclude use of intensive induction chemotherapy.
Adult patients with relapsed or refractory AML.

About Acute Myelogenous Leukemia (AML)

AML is a cancer of the blood and bone marrow marked by rapid disease progression and is the most common acute leukemia affecting adults with approximately 20,000 new cases estimated in the U.S. each year2,3. AML patients are typically older or have comorbidities that preclude the use of intensive chemotherapy4. These patients typically have a worse prognosis and poor outcomes5. The majority of patients with AML eventually relapse6. The five-year survival rate is approximately 28%2. For 6 to 10 percent of AML patients, the mutated IDH1 enzyme blocks normal blood stem cell differentiation, contributing to the genesis of acute leukemia7. IDH1 mutations have been associated with negative prognosis in AML8,9.

About myAgios™ Patient Support Services

myAgios™ Patient Support Services is an expansive program that helps patients with access, reimbursement, and financial assistance for Tibsovo® (ivosidenib). Healthcare providers and pharmacists can enroll patients at myAgios.com/enroll.

About Agios

Agios is focused on discovering and developing novel investigational medicines to treat cancer and rare genetic diseases through scientific leadership in the field of cellular metabolism and adjacent areas of biology. In addition to an active research and discovery pipeline across both therapeutic areas, Agios has two approved oncology precision medicines and multiple first-in-class investigational therapies in clinical and/or preclinical development. All Agios programs focus on genetically identified patient populations, leveraging our knowledge of metabolism, biology and genomics. For more information, please visit the company's website at www.agios.com.

*Dr. Roboz has served as a consultant for Celgene, Bayer, Otsuka, Pfizer, Astellas Pharmaceuticals, Argenx, Astex Pharmaceuticals, Hoffman-La Roche, Janssen, Novartis, Amphivena, AbbVie, Sandoz, Eisai, Jazz Pharmaceuticals, Celltrion, Orsenix and Daiichi Sankyo.

Cautionary Note Regarding Forward-Looking Statements
This press release contains forward-looking statements within the meaning of The Private Securities Litigation Reform Act of 1995. Such forward-looking statements include those regarding the potential benefits of Agios' products, including Tibsovo® (ivosidenib), and its strategic plans and focus. The words "estimate," "may," "milestone," "potential," and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words. Such statements are subject to numerous important factors, risks and uncertainties that may cause actual events or results to differ materially from Agios' current expectations and beliefs. For example, there can be no guarantee that development of any of Agios' product candidates will successfully continue, or that any positive developments in Agios' business will result in stock price appreciation. Management's expectations and, therefore, any forward-looking statements in this press release could also be affected by risks and uncertainties relating to a number of other important factors, including: Agios' results of clinical trials and preclinical studies, including subsequent analysis of existing data and new data received from ongoing and future studies; the content and timing of decisions made by the U.S. FDA and other regulatory authorities, investigational review boards at clinical trial sites and publication review bodies; Agios' ability to obtain and maintain requisite regulatory approvals and to enroll patients in its planned clinical trials; unplanned cash requirements and expenditures; competitive factors; Agios' ability to obtain, maintain and enforce patent and other intellectual property protection for any product candidates it is developing; Agios' ability to maintain key collaborations, such as its agreements with Celgene and CStone Pharmaceuticals; and general economic and market conditions. These and other risks are described in greater detail under the caption "Risk Factors" included in Agios’ public filings with the Securities and Exchange Commission. Any forward-looking statements contained in this press release speak only as of the date hereof, and Agios expressly disclaims any obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law.

References

TIBSOVO® Prescribing Information (U.S.). Agios Pharmaceuticals, Inc.Cambridge, MA. Revised May/2019.

National Cancer Institute Surveillance, Epidemiology, and End Results Program. Cancer Stat Facts: Acute Myeloid Leukemia (AML). https://seer.cancer.gov/statfacts/html/amyl.html. Accessed April 2019.

American Cancer Society. Acute Myeloid Leukemia (AML). https://www.cancer.org/cancer/acute-myeloid-leukemia/about/key-statistics.html. Accessed April 2019.

Kantarjian H, et al. Intensive chemotherapy does not benefit most older patients (age 70 years or older) with acute myeloid leukemia. Blood. 2010;116(22):4422-4429.

Dohner H., Estey E., Grimwade D., et al. Diagnosis and management of AML in adults: 2017 ELN recommendations from an international expert panel. Blood. 2017;129:424-447.

Medeiros BC., et al. Big data analysis of treatment patterns and outcomes among elderly acute myeloid leukemia patients in the United States. Ann Hematol. 2015;94:1127-1138.

DiNardo C. Durable Remissions from Ivosidenib in IDH1-Mutated Relapsed or Refractory AML. New England Journal of Medicine. June 2, 2018

Zhou KG, Jiang LJ, Shang Z, et al. Potential application of IDH1 and IDH2 mutations as prognostic indicators in non-promyelocytic acute myeloid leukemia: a meta-analysis. Leuk Lymphoma. 2012;53(12):2423-2429.

Feng J-H, Guo X-P, Chen Y-Y, Wang Z-J, Cheng Y-P, Tang Y-M. Prognostic significance of IDH1 mutations in acute myeloid leukemia: a meta-analysis. Am J Blood Res. 2012;2(4):254-264.

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