Phase 1/2 Study of Enasidenib (AG-221) in Adults With Advanced Hematologic Malignancies With an Isocitrate Dehydrogenase Isoform 2 (IDH2) Mutation

A Phase 1/2, Multicenter, Open-Label, Dose-Escalation and Expansion, Safety, Pharmacokinetic, Pharmacodynamic, and Clinical Activity Study of Orally Administered AG-221 in Subjects With Advanced Hematologic Malignancies With an IDH2 Mutation

The primary objectives of Phase 1 Dose Escalation/Part 1 Expansion are:

• To assess the safety and tolerability of treatment with enasidenib administered continuously as a single agent dosed orally on Days 1 to 28 of a 28-day cycle in participants with advanced hematologic malignancies.
• To determine the maximum tolerated dose (MTD) or maximum administered dose (MAD) and/or the recommended Phase 2 dose (RP2D) of enasidenib in participants with advanced hematologic malignancies.

The primary objective of Phase 2 is:

• To assess the efficacy of enasidenib as treatment for participants with relapsed or refractory (R/R) acute myelogenous leukemia (AML) with an IDH2 mutation.

Study Overview

• Status: Completed
• Conditions: Hematologic Neoplasms
• Intervention / Treatment: Drug: Enasidenib

• Study Type: Interventional
• Enrollment (Actual): 345
• Phase: Phase 2; Phase 1

Contacts and Locations

Study Locations

• France
  • Bordeaux, France, 33076
    • Local Institution - 202
  • Paris, France, 75010
    • Local Institution - 204
  • Pessac, France, 33604
    • Local Institution - 203
  • Toulouse, France, 31059
    • Local Institution - 205
  • Villejuif, France, 94805
    • Local Institution - 201
• United States
  • California
    • Duarte, California, United States, 91010-301
      • City of Hope
    • Stanford, California, United States, 94305
      • Stanford Cancer Center
  • Colorado
    • Aurora, Colorado, United States, 80045
      • University of Colorado Cancer Center
  • Florida
    • Miami, Florida, United States, 33136
      • University of Miami Sylvester Cancer Center
    • Sarasota, Florida, United States, 34232
      • Florida Cancer Specialists
    • Tampa, Florida, United States, 33612
      • Moffitt Cancer Center
  • Illinois
    • Chicago, Illinois, United States, 60611-3008
      • Northwestern University
  • Massachusetts
    • Boston, Massachusetts, United States, 02117
      • Massachusetts General Hospital
    • Boston, Massachusetts, United States, 02215
      • Dana-Farber/Mass General Brigham Cancer Care, Inc
  • Minnesota
    • Rochester, Minnesota, United States, 55905
      • Mayo Clinic
  • Missouri
    • Saint Louis, Missouri, United States, 63110
      • Washington University
  • New York
    • New York, New York, United States, 10065
      • Cornell University Weill Medical College
    • New York, New York, United States, 10065
      • Memorial Sloan-Kettering Cancer Center - NYC
  • Ohio
    • Cleveland, Ohio, United States, 44195
      • Cleveland Clinic
    • Gahanna, Ohio, United States, 43230
      • Ohio State University
  • Oregon
    • Portland, Oregon, United States, 97239
      • Oregon Health and Science University OHSU
  • Tennessee
    • Nashville, Tennessee, United States, 37203
      • Sarah Cannon Research Institute Drug Development Unit
  • Texas
    • Dallas, Texas, United States, 75390-85520
      • UT Southwestern Medical Center at Dallas
    • Houston, Texas, United States, 77030
      • MD Anderson Cancer Center

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

1. Subject must be greater than or equal to 18 years of age.
2. Subjects must have an advanced hematologic malignancy including:

Phase 1/ Dose escalation:

1. Diagnosis of acute myelogenous leukemia (AML) according to World Health Organization (WHO) criteria;

   • Disease refractory or relapsed (defined as the reappearance of > 5% blasts in the bone marrow).
   • Untreated AML, greater than or equal to 60 years of age and are not candidates for standard therapy due to age, performance status, and/or adverse risk factors, according to the treating physician and with approval of the Medical Monitor;

2. Diagnosis of Myelodysplastic syndrome (MDS) according to WHO classification with refractory anemia with excess blasts (RAEB-1 or RAEB-2), or considered high-risk by the Revised International Prognostic Scoring System (IPSS-R), that is recurrent or refractory, or the subject is intolerant to established therapy known to provide clinical benefit for their condition (i.e., subjects must not be candidates for regimens known to provide clinical benefit), according to the treating physician and with approval of the Medical Monitor.

   Phase 1/Part 1 Expansion:

   Arm 1: Relapsed or refractory AML and age greater than or equal to 60 years or any subject with AML regardless of age who has relapsed following a bone marrow transplant (BMT).

   Arm 2: Relapsed or refractory AML and age <60 years, excluding subjects with AML who have relapsed following a BMT.

   Arm 3: Untreated AML and age greater than or equal to 60 years that decline standard of care chemotherapy.

   Arm 4: Isocitrate dehydrogenase protein, 2 (IDH2)-mutated advanced hematologic malignancies not eligible for Arms 1 to 3.

   Phase 2:

   Diagnosis of AML according to World Health Organization (WHO) criteria and disease relapsed or refractory as defined by:

   • Subjects who relapse after allogeneic transplantation;
   • Subjects in second or later relapse;
   • Subjects who are refractory to initial induction or re-induction treatment
   • Subjects who relapse within 1 year of initial treatment, excluding patients with favorable-risk status according to National Comprehensive Cancer Network (NCCN) Guidelines. Favorable-risk cytogenetics: inv(16), t(16;16), t(8;21), t(15;17)

3. Subjects must have documented IDH2 gene-mutated disease:

   • For subjects in the dose escalation phase and Part 1 Expansion, IDH2 mutation may be based on local evaluation. (Centralized testing will be performed retrospectively.)
   • For subjects in the Phase 2 portion of the trial, central testing of IDH2 mutation of bone marrow aspirate and peripheral blood, is required during screening to confirm eligibility

4. Subjects must be amenable to serial bone marrow sampling, peripheral blood sampling and urine sampling during the study.

   • The diagnosis and evaluation of AML or MDS will be made by bone marrow aspiration and/or biopsy. If an aspirate is unobtainable (i.e., a "dry tap"), the diagnosis may be made from the core biopsy.

   • Screening bone marrow aspirate and peripheral blood samples are required of all subjects. A bone marrow biopsy must be collected if adequate aspirate is not attainable unless:

     • A bone marrow aspirate and biopsy was performed as part of the standard of care within 28 days prior to the start of the study treatment; and
     • Slides of bone marrow aspirate, biopsy and stained peripheral blood smear are available for both local and central pathology reviewers; and
     • A bone marrow aspirate sample acquired within 28 days prior to the start of study treatment has been sent for cytogenetic analysis.
5. Subjects must be able to understand and willing to sign an informed consent. A legally authorized representative may consent on behalf of a subject who is otherwise unable to provide informed consent, if acceptable to and approved by the site and/or sites Institutional Review Board (IRB)/Independent Ethics Committee (IEC).
6. Subjects must have Eastern Cooperative Oncology Group (ECOG) Performance status (PS) of 0 to 2.
7. Platelet count ≥ 20,000/μL (transfusions to achieve this level are allowed). Subjects with a baseline platelet count of < 20,000/μL due to underlying malignancy are eligible with Medical Monitor approval.

8. Subjects must have adequate hepatic function as evidenced by:

   • Serum total bilirubin ≤ 1.5 × upper limit of normal (ULN), unless considered due to Gilbert's disease, a gene mutation in UGT1A1, or leukemic organ involvement, following approval by the Medical Monitor;
   • Aspartate aminotransferase (AST), alanine aminotransferase (ALT) and alkaline phosphatase (ALP) ≤ 3.0 × ULN, unless considered due to leukemic organ involvement.

9. Subjects must have adequate renal function as evidenced by:

   • Serum creatinine ≤ 2.0 × ULN OR

   • Creatinine clearance greater than 40 mL/min based on the Cockroft-Gault glomerular filtration rate (GFR) estimation: (140 - Age) x (weight in kg) x (0.85 if female)/72 x serum creatinine

10. Subjects must be recovered from any clinically relevant toxic effects of any prior surgery, radiotherapy, or other therapy intended for the treatment of cancer. (Subjects with residual Grade 1 toxicity, for example Grade 1 peripheral neuropathy or residual alopecia, are allowed with approval of the Medical Monitor)
11. Female subjects of child-bearing potential must agree to undergo medically supervised pregnancy test prior to starting study drug. The first pregnancy test will be performed at screening (within 7 days prior to first study drug administration), and on the day of the first study drug administration and confirmed negative prior to dosing and Day 1 before dosing all subsequent cycles.
12. Female subjects with reproductive potential must have a negative serum pregnancy test within 7 days prior to the start of therapy. Subjects with reproductive potential are defined as sexually mature women who have not undergone a hysterectomy, bilateral oophorectomy or tubal occlusion or who have not been naturally postmenopausal (i.e., who have not menstruated at all) for at least 24 consecutive months (i.e., has had menses at any time in the preceding 24 consecutive months). Females of reproductive potential as well as fertile men and their partners who are female of reproductive potential must agree to abstain from sexual intercourse or to use two highly effective forms of contraception from the time of giving informed consent, during the study and for 120 days (females and males) following the last dose of AG-221. A highly effective form of contraception is defined as hormonal oral contraceptives, injectables, patches, intrauterine devices, double-barrier method (e.g., synthetic condoms, diaphragm, or cervical cap with spermicidal foam, cream, or gel), or male partner sterilization.
13. Able to adhere to the study visit schedule (ie, clinic visits at the study sites are mandatory, unless noted otherwise for particular study visits) and other protocol requirements.

Exclusion Criteria:

1. Subjects who have undergone hematopoietic stem cell transplant (HSCT) within 60 days of the first dose of AG-221, or subjects on immunosuppressive therapy post HSCT at the time of screening, or with clinically significant graft-versus-host disease (GVHD). (The use of a stable dose of oral steroids post GVHD and/or topical steroids for ongoing skin GVHD is permitted with Medical Monitor approval.)
2. Subjects who received systemic anticancer therapy or radiotherapy < 14 days prior to their first day of study drug administration. (Hydroxyurea is allowed for up to 28 days after the start of AG-221 for the control of peripheral leukemic blasts in subjects with white blood cell [WBC] counts > 30,000/μL as well as prior to enrollment).
3. Subjects who received a small molecule investigational agent < 14 days prior to their first day of study drug administration. In addition, the first dose of AG-221 should not occur before a period ≥ 5 half-lives of the investigational agent has elapsed.
4. Subjects taking the following sensitive cytochrome P450 (CYP) substrate medications that have a narrow therapeutic range are excluded from the study unless they can be transferred to other medications within ≥5 half-lives prior to dosing: paclitaxel (CYP2C8) warfarin, phenytoin (CYP2C9), S-mephenytoin (CYP2C19), thioridazine (CYP2D6), theophylline and tizanidine (CYP1A2).
5. Subjects taking the P-glycoprotein (P-gp) and breast cancer resistant protein (BCRP) transporter-sensitive substrates digoxin and rosuvastatin should be excluded from the study unless they can be transferred to other medications within ≥ 5 half-lives prior to dosing.
6. Subjects for whom potentially curative anticancer therapy is available.
7. Subjects who are pregnant or lactating.
8. Subjects with an active severe infection that required anti-infective therapy or with an unexplained fever > 38.5°C during screening visits or on their first day of study drug administration (at the discretion of the Investigator, subjects with tumor fever may be enrolled).
9. Subjects with known hypersensitivity to any of the components of AG-221.
10. Subjects with New York Heart Association (NYHA) Class III or IV congestive heart failure or left ventricular ejection fraction (LVEF) < 40% by echocardiogram (ECHO) or multi-gated acquisition (MUGA) scan within approximately 28 days of Cycle 1, Day 1 (C1D1).
11. Subjects with a history of myocardial infarction within the last 6 months of screening.
12. Subjects with uncontrolled hypertension (systolic blood pressure [BP] >180 mmHg or diastolic BP > 100 mmHg) at screening are excluded. Subjects requiring 2 or more medications to control hypertension are eligible with Medical Monitor approval.
13. Subjects with known unstable or uncontrolled angina pectoris.
14. Subjects with a known history of severe and/or uncontrolled ventricular arrhythmias.
15. Subjects with heart-rate corrected QT (QTc) interval ≥ 450 msec or other factors that increase the risk of QT prolongation or arrhythmic events (e.g., heart failure, hypokalemia, family history of long QT interval syndrome) at screening.
16. Subjects taking medications that are known to prolong the QT interval unless they can be transferred to other medications within ≥ 5 half-lives prior to dosing.
17. Subjects with known infection with human immunodeficiency virus (HIV) or active hepatitis B or C.
18. Subjects with any other medical or psychological condition, deemed by the Investigator to be likely to interfere with a subject's ability to sign informed consent, cooperate, or participate in the study.
19. Subjects with known dysphagia, short-gut syndrome, gastroparesis, or other conditions that limit the ingestion or gastrointestinal absorption of drugs administered orally.
20. Subjects with clinical symptoms suggesting active central nervous system (CNS) leukemia or known CNS leukemia.
21. Subjects with immediately life-threatening, severe complications of leukemia such as uncontrolled bleeding, pneumonia with hypoxia or shock, and/or disseminated intravascular coagulation.
22. In the Phase 2 portion of the trial only, subjects who have previously received treatment with an inhibitor of Isocitrate dehydrogenase ( IDH).

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Sequential Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: enasidenib; enasidenib administered orally. Multiple doses will be administered to determine the RP2D.	Drug: Enasidenib; Enasidenib tablets administered orally every day of 28-day treatment cycles until disease progression or unacceptable toxicities.; Other Names: AG-221; IDHIFA

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Phase 1 Dose Escalation: Number of Participants With Dose Limiting Toxicities (DLT)	Toxicity severity was graded according to the National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) Version 4.03. A DLT was defined as: Non-hematologic toxicities: CTCAE ≥ Grade 3 with the exception of ≥ Grade 3 blood bilirubin increases in participants with a uridine diphosphate- glucuronosyltransferase 1 family, polypeptide A1 (UGT1A1) mutation. In participants with a UGT1A1 mutation, blood bilirubin increases of > 5× upper limit of normal (ULN) were considered a DLT.; Hematologic toxicities: Prolonged myelosuppression, defined as persistence of ≥ Grade 3 neutropenia or thrombocytopenia (by NCI CTCAE v4.03), leukemia-specific criteria, i.e., marrow cellularity <5% on Day 28 or later from the start of study drug without evidence of leukemia) at least 42 days after the initiation of Cycle 1 therapy. Leukemia-specific grading was used for cytopenias (based on percentage decrease from Baseline: 50 to 75% = Grade 3, >75% = Grade 4)	From time of first dose up to the end of Cycle 1; 28 days
Phase 1 Dose Escalation: Number of Participants With Treatment Emergent Adverse Events (TEAEs)	A TEAE is any adverse event that began or worsened on or after the start of investigational product (IP) through 28 days after the last dose. A treatment-related TEAE is a TEAE that is suspected (possibly or probably related) by the Investigator to be related to the IP. A serious AE is one that at any dose of IP or at any time during the observation period met the following criteria: Resulted in death;; Was life threatening;; Requires inpatient hospitalization or prolongation of existing hospitalization;; Resulted in persistent or significant disability/incapacity;; Was a congenital anomaly/birth defect;; Was medically important. The intensity of each AE was graded from 1 to 5 according to the NCI CTCAE Version 4.03, and according to the following: Mild (Grade 1), Moderate (Grade 2), Severe (Grade 3), Life threatening (Grade 4), or Death (Grade 5).	From the first dose of investigational product (IP) up to 28 days after the last dose, up to the data cutoff date of 01 September 2017; median treatment duration in the dose escalation phase was 5.0 months (range 0.4 to 34.2 months).
Phase 1 Dose Expansion: Number of Participants With Treatment Emergent Adverse Events	A TEAE is any adverse event that began or worsened on or after the start of investigational product (IP) through 28 days after the last dose. A treatment-related TEAE is a TEAE that is suspected (possibly or probably related) by the Investigator to be related to the IP. A serious AE is one that at any dose of IP or at any time during the observation period met the following criteria: Resulted in death;; Was life threatening;; Required inpatient hospitalization or prolongation of existing hospitalization;; Resulted in persistent or significant disability/incapacity;; Was a congenital anomaly/birth defect;; Was medically important. The intensity of each AE was graded from 1 to 5 according to the NCI CTCAE Version 4.03, and according to the following: Mild (Grade 1), Moderate (Grade 2), Severe (Grade 3), Life threatening (Grade 4), or Death (Grade 5).	From the first dose of investigational product (IP) up to 28 days after the last dose of IP up to the data cutoff date of 01 September 2017; median treatment duration in Part 1 Expansion was 5.2 months (range 0.5 to 32.8 months).
Phase 2 Dose Expansion: Investigator Assessed Overall Response Rate (ORR)	ORR is defined as the percentage of participants achieving an overall response of complete response (CR), CR with incomplete neutrophil recovery (CRi), CR with incomplete platelet recovery (CRp), partial response (PR), or morphologic leukemia-free state (MLFS) based on the 2003 revised International Working Group (IWG) criteria for AML, assessed by the Investigator. CR: Absolute neutrophil count (ANC) > 1.0 x10⁹/L; Platelet count > 100 x10⁹/L; Bone marrow (BM) blasts < 5%; Absence of blasts with Auer rods; Independence of red cell transfusions CRi: All CR criteria except for residual neutropenia (ANC < 1.0 x 10⁹/L CRp: All CR criteria except for residual thrombocytopenia (platelets < 100 x 10⁹/L) PR: Meets hematologic criteria of CR; Decrease of BM blasts to 5-25% and decrease of pretreatment BM blast ≥ 50%. MLFS: Bone marrow blasts < 5%; Absence of blasts with Auer rods; Absence of extramedullary disease; No hematologic recovery required	Response assessments were performed every 28 days through Month 12 and every 56 days thereafter until the end of treatment; median duration of treatment exposure in Phase 2 was 5.3 months (range 0.4 to 22.5 months).
Phase 2 Dose Expansion: Number of Participants With Treatment Emergent Adverse Events	A TEAE is any adverse event that began or worsened on or after the start of investigational product (IP) through 28 days after the last dose. A treatment-related TEAE is a TEAE that is suspected (possibly or probably related) by the Investigator to be related to the IP. A serious AE is one that at any dose of IP or at any time during the observation period met the following criteria: Resulted in death;; Was life threatening;; Required inpatient hospitalization or prolongation of existing hospitalization;; Resulted in persistent or significant disability/incapacity;; Was a congenital anomaly/birth defect;; Was medically important. The intensity of each AE was graded from 1 to 5 according to the NCI CTCAE Version 4.03, and according to the following: Mild (Grade 1), Moderate (Grade 2), Severe (Grade 3), Life threatening (Grade 4), or Death (Grade 5).	From the first dose of investigational product (IP) up to 28 days after the last dose, up to the data cutoff of date of 01 September 2017; median duration of treatment exposure in Phase 2 was 5.3 months (range 0.4 to 22.5 months).
Safety Follow-up: Number of Participants With Treatment Emergent Adverse Events	A TEAE is any adverse event that began or worsened on or after the start of investigational product (IP) through 28 days after the last dose. A treatment-related TEAE is a TEAE that is suspected (possibly or probably related) by the Investigator to be related to the IP. A serious AE is one that at any dose of IP or at any time during the observation period met the following criteria: Resulted in death;; Was life threatening;; Required inpatient hospitalization or prolongation of existing hospitalization;; Resulted in persistent or significant disability/incapacity;; Was a congenital anomaly/birth defect;; Was medically important. The intensity of each AE was graded from 1 to 5 according to the NCI CTCAE Version 4.03, and according to the following: Mild (Grade 1), Moderate (Grade 2), Severe (Grade 3), Life threatening (Grade 4), or Death (Grade 5).	From the primary analysis cut-off date of 01 September 2017 to the final analysis cut-off date of 29 July 2019, a maximum of 23 months.

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Phase 1 Dose Escalation: Investigator Assessed Overall Response Rate (ORR) by Total Daily Dose	ORR is defined as the percentage of participants achieving an overall response of CR, CRi, CRp, PR, marrow CR (mCR) (for MDS) and MLFS (for AML) based on the 2003 revised IWG criteria for AML and 2006 modified IWG criteria for MDS. CR: ANC > 1.0 x10⁹/L; Platelet count > 100 x10⁹/L; Bone marrow (BM) blasts < 5%; Absence of blasts with Auer rods; Independence of red cell transfusions CRi: All CR criteria except for residual neutropenia (ANC < 1.0 x 10⁹/L CRp: All CR criteria except for residual thrombocytopenia (platelet counts < 100 x 10⁹/L) PR: Meets hematologic criteria of CR; Decrease of BM blasts to 5-25% and decrease of pretreatment BM blast ≥ 50%. MLFS: Bone marrow blasts < 5%; Absence of blasts with Auer rods; Absence of extramedullary disease; No hematologic recovery required mCR: Bone marrow myeloblasts ≤ 5% and decreased by ≥ 50%	Response assessments were performed every 28 days through Month 12 and every 56 days thereafter until the end of treatment; median duration of treatment exposure in the dose escalation phase was 5.0 months (range 0.4 to 34.2 months).
Phase 1 Dose Expansion: Investigator Assessed Overall Response Rate (ORR)	ORR is defined as the percentage of participants achieving an overall response of CR, CRi, CRp, PR, mCR (for MDS), or MLFS (for AML) based on the 2003 revised IWG criteria for AML and 2006 modified IWG criteria for MDS. CR: ANC > 1.0 x10⁹/L; Platelet count > 100 x10⁹/L; Bone marrow (BM) blasts < 5%; Absence of blasts with Auer rods; Independence of red cell transfusions CRi: All CR criteria except for residual neutropenia (ANC < 1.0 x 10⁹/L CRp: All CR criteria except for residual thrombocytopenia (platelet counts < 100 x 10⁹/L) PR: Meets hematologic criteria of CR; Decrease of BM blasts to 5-25% and decrease of pretreatment BM blast ≥ 50%. MLFS: Bone marrow blasts < 5%; Absence of blasts with Auer rods; Absence of extramedullary disease; No hematologic recovery required mCR: Bone marrow myeloblasts ≤ 5% and decreased by ≥ 50%	Response assessments were performed every 28 days through Month 12 and every 56 days thereafter until the end of treatment; median duration of treatment exposure in Phase 1 Dose Expansion was 5.2 months (range 0.5 to 32.8 months).
Combined Phase 1/2: Investigator Assessed Overall Response Rate in Participants With R/R AML	For participants with R/R AML ORR is defined as the percentage of participants achieving an overall response of CR, CRi, CRp, PR, or MLFS based on the 2003 revised IWG criteria for AML. CR: ANC > 1.0 x10⁹/L; Platelet count > 100 x10⁹/L; Bone marrow (BM) blasts < 5%; Absence of blasts with Auer rods; Independence of red cell transfusions CRi: All CR criteria except for residual neutropenia (ANC < 1.0 x 10⁹/L CRp: All CR criteria except for residual thrombocytopenia (platelet counts < 100 x 10⁹/L) PR: Meets hematologic criteria of CR; Decrease of BM blasts to 5-25% and decrease of pretreatment BM blast ≥ 50%. MLFS: Bone marrow blasts < 5%; Absence of blasts with Auer rods; Absence of extramedullary disease; No hematologic recovery required	Response assessments were performed every 28 days through Month 12 and every 56 days thereafter until the end of treatment; median duration of treatment exposure for Phase 1 and 2 R/R AML participants was 5.4 months (range 0.4 to 34.2 months).
Phase 1 Dose Escalation: Complete Response Rate (CRR) by Total Daily Dose	Complete response rate is defined as the percentage of participants achieving a complete response (CR) based on the 2003 revised IWG criteria for AML or the 2006 modified IWG criteria for MDS as assessed by the investigator. CR for AML: Absolute neutrophil count (ANC) > 1.0 x10⁹/L; Platelet count > 100 x10⁹/L; Bone marrow (BM) blasts < 5%; Absence of blasts with Auer rods; Independence of red cell transfusions CR for MDS: Bone marrow: ≤ 5% myeloblasts with normal maturation of all cell lines; Peripheral blood:Hemoglobin ≥ 11 g/dLPlatelets ≥ 100 × 10⁹/LNeutrophils ≥ 1.0 × 10⁹/LBlasts = 0%	Response assessments were performed every 28 days through Month 12 and every 56 days thereafter until the end of treatment; median duration of treatment exposure in Phase 1 Dose Escalation was 5.0 months (range 0.4 to 34.2 months).
Phase 1 Dose Expansion: Complete Response Rate	Complete response rate is defined as the percentage of participants achieving a complete response (CR) based on the 2003 revised IWG criteria for AML or the 2006 modified IWG criteria for MDS as assessed by the investigator. CR for AML: Absolute neutrophil count (ANC) > 1.0 x10⁹/L; Platelet count > 100 x10⁹/L; Bone marrow (BM) blasts < 5%; Absence of blasts with Auer rods; Independence of red cell transfusions CR for MDS: Bone marrow: ≤ 5% myeloblasts with normal maturation of all cell lines; Peripheral blood:Hemoglobin ≥ 11 g/dLPlatelets ≥ 100 × 10⁹/LNeutrophils ≥ 1.0 × 10⁹/LBlasts = 0%	Response assessments were performed every 28 days through Month 12 and every 56 days thereafter until the end of treatment; median duration of treatment exposure in Phase 1 Dose Expansion was 5.2 months (range 0.5 to 32.8 months).
Phase 2 Dose Expansion: Complete Response Rate	Complete response rate is defined as the percentage of participants achieving a complete response (CR) based on the 2003 revised IWG criteria for AML as assessed by the investigator. CR for AML: Absolute neutrophil count (ANC) > 1.0 x10⁹/L; Platelet count > 100 x10⁹/L; Bone marrow (BM) blasts < 5%; Absence of blasts with Auer rods; Independence of red cell transfusions	Response assessments were performed every 28 days through Month 12 and every 56 days thereafter until the end of treatment; median duration of treatment exposure in Phase 2 was 5.3 months (range 0.4 to 22.5 months).
Phase 1 Dose Escalation: Rate of Complete Response and Complete Response With Incomplete Hematological Recovery (CR/CRi/CRp) by Total Daily Dose	The percentage of participants achieving a complete response (CR), CR with incomplete neutrophil recovery (CRi), or a CR with incomplete platelet recovery (CRp), based on the 2003 revised IWG criteria for AML and 2006 modified IWG criteria for MDS per investigator review. CR: ANC > 1.0 x10⁹/L; Platelet count > 100 x10⁹/L; Bone marrow (BM) blasts < 5%; Absence of blasts with Auer rods; Independence of red cell transfusions CRi: All CR criteria except for residual neutropenia (ANC < 1.0 x 10⁹/L CRp: All CR criteria except for residual thrombocytopenia (platelet counts < 100 x 10⁹/L)	Response assessments were performed every 28 days through Month 12 and every 56 days thereafter until the end of treatment; median duration of treatment exposure in the Phase 1 Dose Escalation was 5.0 months (range 0.4 to 34.2 months).
Phase 1 Dose Expansion: Rate of Complete Response and Complete Responses With Incomplete Hematological Recovery (CR/CRi/CRp)	The percentage of participants achieving a complete response (CR), CR with incomplete neutrophil recovery (CRi), or a CR with incomplete platelet recovery (CRp) based on the 2003 revised IWG criteria for AML or the 2006 modified IWG criteria for MDS, assessed by the investigator. CR: ANC > 1.0 x10⁹/L; Platelet count > 100 x10⁹/L; Bone marrow (BM) blasts < 5%; Absence of blasts with Auer rods; Independence of red cell transfusions CRi: All CR criteria except for residual neutropenia (ANC < 1.0 x 10⁹/L CRp: All CR criteria except for residual thrombocytopenia (platelet counts < 100 x 10⁹/L)	Response assessments were performed every 28 days through Month 12 and every 56 days thereafter until the end of treatment; median duration of treatment exposure in Phase 1 Dose Expansion was 5.2 months (range 0.5 to 32.8 months).
Phase 2 Dose Expansion: Rate of Complete Response and Complete Responses With Incomplete Hematological Recovery (CR/CRi/CRp)	The percentage of participants achieving a complete response (CR), CR with incomplete neutrophil recovery (CRi), or a CR with incomplete platelet recovery (CRp) based on the 2003 revised IWG criteria for AML, assessed by the Investigator. CR: ANC > 1.0 x10⁹/L; Platelet count > 100 x10⁹/L; Bone marrow (BM) blasts < 5%; Absence of blasts with Auer rods; Independence of red cell transfusions CRi: All CR criteria except for residual neutropenia (ANC < 1.0 x 10⁹/L CRp: All CR criteria except for residual thrombocytopenia (platelet counts < 100 x 10⁹/L)	Response assessments were performed every 28 days through Month 12 and every 56 days thereafter until the end of treatment; median duration of treatment exposure in Phase 2 was 5.3 months (range 0.4 to 22.5 months).
Phase 1 Dose Expansion: Kaplan-Meier Estimate of Duration of Response (DOR)	Among participants who had a response of CR, CRi, CRp, PR, mCR, or MLFS based on the 2003 revised IWG criteria for AML or the 2006 modified IWG criteria for MDS, assessed by the Investigator, duration of response was calculated from the date of the first occurrence of response to the date of documented disease relapse, progression, or death due to any cause, whichever occurred first. DOR was estimated using the Kaplan-Meier method. Participants without relapse, progressive disease, or death due to any cause were censored at the date of the last adequate response assessment.	From first dose of study treatment to the data cut-off date of 01 September 2017; overall median time on follow-up in Phase 1 Dose Expansion was 8.3 months (range 0.5 to 32.8 months).
Phase 2 Dose Expansion: Kaplan-Meier Estimate of Duration of Response	For participants with an objective response based on the 2003 revised IWG criteria for AML assessed by the Investigator, duration of response was calculated from the date of the first occurrence of response to the date of documented disease relapse, progression, or death due to any cause, whichever occurred first. Participants without relapse, progressive disease or death were censored at the last response assessment date. Relapse (for participants who previously attained CR, Cri, CRp or MLFS): BM blasts ≥ 5%, reappearance of blasts in the blood or development of extramedullary disease. Disease progression (for participants who previously attained PR): development of new extramedullary disease, or For participants with 5% to 67% BM blasts at nadir: a > 50% increase in BM blasts from nadir and that is ≥ 20%. For participants with ≥ 67% BM blasts at nadir: a doubling of the nadir absolute peripheral blood (PB) blast count and the final absolute PB blast count > 10 x 10⁹/L.	From first dose of study treatment to the data cut-off date of 01 September 2017; median time on follow-up in Phase 2 was 5.8 months (range 0.4 to 22.5 months).
Phase 1 Dose Expansion: Kaplan-Meier Estimate of Overall Survival	Overall survival is defined as the time from first dose to the date of death due to any cause. Participants still alive were censored at the last date known to be alive or at the data cut-off date, whichever was earlier.	From first dose of study treatment to the data cut-off date of 01 September 2017; overall median time on follow-up in Phase 1 Dose Expansion was 8.3 months (range 0.5 to 32.8 months).
Phase 2 Dose Expansion: Kaplan-Meier Estimate of Overall Survival	Overall survival is defined as the time from first dose to the date of death due to any cause. Participants still alive were censored at the last date known to be alive or at the data cut-off date, whichever was earlier.	From first dose of study treatment to the data cut-off date of 01 September 2017; median time on follow-up in Phase 2 was 5.8 months (range 0.4 to 22.5 months).
Phase 1 Combined: Percentage of Participants Who Achieved 56-Day Red Blood Cell Transfusion Independence Post-baseline	Participants who achieved 56-day post-baseline red blood cell (RBC) transfusion independence, i.e. with no RBC transfusions for at least 56 consecutive days during the treatment exposure period, reported by Baseline RBC transfusion dependence status. Participants with at least one transfusion during the Baseline period were considered transfusion dependent at Baseline, where the Baseline period is defined as 28 days before and 28 days after the first dose of treatment for Phase 1. Results are reported for all participants in Phase 1 combined and for the subset of participants with R/R AML.	Baseline to the end of treatment; overall median duration of treatment exposure in Phase 1 combined was 5.1 months (range 0.4, 34.2 months).
Phase 1 Combined: Percentage of Participants Who Achieved 56-Day Platelet Transfusion Independence Post-baseline	Participants who achieved 56-day post-baseline platelet transfusion independence, i.e. with no platelet transfusions for at least 56 consecutive days during the treatment exposure period, reported by Baseline platelet transfusion dependence status. Participants with at least one transfusion during the Baseline period were considered transfusion dependent at Baseline, where the Baseline period is defined as 28 days before and 28 days after the first dose of treatment for Phase 1. Results are reported for all participants in Phase 1 combined and for the subset of participants with R/R AML.	Baseline to the end of treatment; overall median duration of treatment exposure in Phase 1 combined was 5.1 months (range 0.4, 34.2 months).
Phase 2: Percentage of Participants Who Achieved 56-Day Red Blood Cell Transfusion Independence Post-baseline	Participants who achieved 56-day post-baseline red blood cell (RBC) transfusion independence, i.e. with no RBC transfusions for at least 56 consecutive days during the treatment exposure period, reported by Baseline RBC transfusion dependence status. Participants with at least one transfusion during the Baseline period were considered transfusion dependent at Baseline, where the Baseline period is defined as 56 days before the first dose date for Phase 2.	Baseline to the end of treatment; median duration of treatment exposure in Phase 2 was 5.3 months (range 0.4 to 22.5 months).
Phase 2: Percentage of Participants Who Achieved 56-Day Platelet Transfusion Independence Post-baseline	Participants who achieved 56-day post-baseline platelet transfusion independence, i.e. with no platelet transfusions for at least 56 consecutive days during the treatment exposure period, reported by Baseline platelet transfusion dependence status. Participants with at least one transfusion during the Baseline period were considered transfusion dependent at Baseline, where the Baseline period is defined as 56 days before the first dose date for Phase 2.	Baseline to the end of treatment; median duration of treatment exposure in Phase 2 was 5.3 months (range 0.4 to 22.5 months).
Phase 1 Dose Expansion: Kaplan-Meier Estimate of Event Free Survival (EFS)	Event-free survival is defined as the interval from the date of the first dose to the date of documented relapse, progression, or death due to any cause, whichever occurs first. Participants without an EFS event were censored at the date of the last adequate response assessment.	From first dose of study treatment to the data cut-off date of 01 September 2017; overall median time on follow-up in Phase 1 Dose Expansion was 8.3 months (range 0.5 to 32.8 months).
Phase 2 Dose Expansion: Kaplan-Meier Estimate of Event Free Survival	Event-free survival is defined as the interval from the date of the first dose to the date of documented relapse, progression, or death due to any cause, whichever occurred first. Participants without an EFS event were censored at the date of the last adequate response assessment.	From first dose of study treatment to the data cut-off date of 01 September 2017; median time on follow-up in Phase 2 was 5.8 months (range 0.4 to 22.5 months).
Phase 1 Dose Expansion: Kaplan-Meier Estimate of Duration of Complete Response (DOCR)	Among participants who had a response of CR based on the 2003 revised IWG criteria for AML and 2006 modified IWG criteria for MDS assessed by the Investigator, duration of complete response was calculated from the date of the first occurrence of complete response to the date of documented disease relapse, progression or death, whichever occurred earlier. DOCR was estimated using the Kaplan-Meier method. Participants without relapse, progressive disease, or death due to any cause were censored at the date of the last adequate response assessment.	From first dose of study treatment to the data cut-off date of 01 September 2017; overall median time on follow-up in Phase 1 Dose Expansion was 8.3 months (range 0.5 to 32.8 months).
Phase 2 Dose Expansion: Duration of Complete Response	Among participants who had a response of CR based on the 2003 revised IWG criteria for AML assessed by the Investigator, duration of complete response was calculated from the date of the first occurrence of complete response to the date of documented disease relapse, progression or death, whichever occurred earlier. DOCR was estimated using the Kaplan-Meier method. Participants without relapse, progressive disease, or death due to any cause were censored at the date of the last adequate response assessment.	From first dose of study treatment to the data cut-off date of 01 September 2017; median time on follow-up in Phase 2 was 5.8 months (range 0.4 to 22.5 months).
Phase 1 Dose Escalation: Time to First Response by Total Daily Dose	Time to response is defined as the time from the date of first dose to the date of the first occurrence of response of CR, CRi, CRp, PR, mCR (for MDS) or MLFS (for AML) based on the 2003 revised IWG criteria for AML and 2006 modified IWG criteria for MDS as assessed by the Investigator.	Response assessments were performed every 28 days through Month 12 and every 56 days thereafter until the end of treatment; median duration of treatment exposure in Phase 1 Dose Escalation was 5.0 months (range 0.4 to 34.2 months).
Phase 1 Dose Expansion: Time to First Response	Time to response is defined as the time from the date of first dose to the date of the first occurrence of response of CR, CRi, CRp, PR, mCR (for MDS) or MLFS (for AML) based on the 2003 revised IWG criteria for AML and 2006 modified IWG criteria for MDS as assessed by the Investigator.	Response assessments were performed every 28 days through Month 12 and every 56 days thereafter until the end of treatment; median duration of treatment exposure in Phase 1 Dose Expansion was 5.2 months (range 0.5 to 32.8 months).
Phase 2 Dose Expansion: Time to First Response	Time to response is defined as the time from the date of first dose to the date of the first occurrence of response of CR, CRi, CRp, PR, or MLFS based on the 2003 revised IWG criteria for AML as assessed by the Investigator.	Response assessments were performed every 28 days through Month 12 and every 56 days thereafter until the end of treatment; median duration of treatment exposure in Phase 2 was 5.3 months (range 0.4 to 22.5 months).
Phase 1 Dose Escalation: Time to Best Response by Total Daily Dose	Time to best response is defined as the time from the date of the first dose to the date of the first occurrence of best response according to the following hierarchical order: CR, CRi/CRp, PR, mCR (for MDS) / MLFS (for AML) based on the 2003 revised IWG criteria for AML and 2006 modified IWG criteria for MDS per investigator assessment.	Response assessments were performed every 28 days through Month 12 and every 56 days thereafter until the end of treatment; median duration of treatment exposure in Phase 1 Dose Escalation was 5.0 months (range 0.4 to 34.2 months).
Phase 1 Dose Expansion: Time to Best Response	Time to best response is defined as the time from the date of the first dose to the date of the first occurrence of best response according to the following hierarchical order: CR, CRi/CRp, PR, mCR (for MDS) / MLFS (for AML) based on the 2003 revised IWG criteria for AML and 2006 modified IWG criteria for MDS per investigator assessment.	Response assessments were performed every 28 days through Month 12 and every 56 days thereafter until the end of treatment; median duration of treatment exposure in Part 1 Dose Expansion was 5.2 months (range 0.5 to 32.8 months).
Phase 2 Dose Expansion: Time to Best Response	Time to best response is defined as the time from the date of the first dose to the date of the first occurrence of best response according to the following hierarchical order: CR, CRi/CRp, PR, or MLFS based on the 2003 revised IWG criteria for AML per investigator assessment.	Response assessments were performed every 28 days through Month 12 and every 56 days thereafter until the end of treatment; median duration of treatment exposure in Phase 2 was 5.3 months (range 0.4 to 22.5 months).
Phase 1 Dose Escalation: Time to Complete Response by Total Daily Dose	Time to complete response is defined as the time from the date of the first dose to the date of the first complete response based on the 2003 revised IWG criteria for AML and 2006 modified IWG criteria for MDS per investigator assessment.	Response assessments were performed every 28 days through Month 12 and every 56 days thereafter until the end of treatment; median duration of treatment exposure in the Phase 1 Dose Escalation phase was 5.0 months (range 0.4 to 34.2 months).
Phase 1 Dose Expansion: Time to Complete Response	Time to complete response is defined as the time from the date of the first dose to the date of the first complete response based on the 2003 revised IWG criteria for AML and 2006 modified IWG criteria for MDS per investigator assessment.	Response assessments were performed every 28 days through Month 12 and every 56 days thereafter until the end of treatment; median duration of treatment exposure in Part 1 Dose Expansion was 5.2 months (range 0.5 to 32.8 months).
Phase 2 Dose Expansion: Time to Complete Response	Time to complete response is defined as the time from the date of the first dose to the date of the first complete response based on the 2003 revised IWG criteria for AML per investigator assessment.	Response assessments were performed every 28 days through Month 12 and every 56 days thereafter until the end of treatment; median duration of treatment exposure in Phase 2 was 5.3 months (range 0.4 to 22.5 months).
Phase 1: Area Under the Plasma Concentration Time Curve From Time Zero to 8 Hours Postdose (AUC0-8) of Enasidenib After a Single Oral Dose on Day -3	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Dose Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3) for assessment of enasidenib pharmacokinetics (PK). Plasma enasidenib was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. Area under the plasma concentration-time curve from time 0 to 8 hours post-dose (AUC0-8) was calculated using the linear trapezoidal rule.	Day -3 prior to the single dose of enasidenib and at 0.5, 1, 2, 3, 4, 6, and 8 hours post-dose.
Phase 1: Area Under the Plasma Concentration Time Curve From Time Zero to 10 Hours Postdose (AUC0-10) of Enasidenib After a Single Oral Dose on Day -3	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3). Plasma enasidenib was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. Area under the plasma concentration-time curve from time 0 to 10 hours post-dose (AUC0-10) was calculated using the linear trapezoidal rule.	Day -3 prior to the single dose of enasidenib and at 0.5, 1, 2, 3, 4, 6, 8, and 10 hours post-dose.
Phase 1: Area Under the Plasma Concentration Time Curve From Time Zero to 24 Hours Postdose (AUC0-24) of Enasidenib After a Single Oral Dose on Day -3	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3). Plasma enasidenib was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. Area under the plasma concentration-time curve from time 0 to 24 hours post-dose (AUC0-24) was calculated using the linear trapezoidal rule.	Day -3 prior to the single dose of enasidenib and at 0.5, 1, 2, 3, 4, 6, 8, 10, and 24 hours post-dose.
Phase 1: Area Under the Plasma Concentration Time Curve From Time Zero to 72 Hours Postdose (AUC0-72) of Enasidenib After a Single Oral Dose on Day -3	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3). Plasma enasidenib was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. Area under the plasma concentration-time curve from time 0 to 72 hours post-dose (AUC0-72) was calculated using the linear trapezoidal rule.	Day -3 prior to the single dose of enasidenib and at 0.5, 1, 2, 3, 4, 6, 8, 10, 24, 48, and 72 hours post-dose.
Phase 1: Area Under the Plasma Concentration Time Curve From Time Zero to the Last Quantifiable Concentration (AUC0-t) of Enasidenib After a Single Oral Dose on Day -3	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3). Plasma enasidenib was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. Area under the plasma concentration-time curve from time 0 to the time of the last quantifiable concentration (AUC0-t) was calculated using the linear trapezoidal rule.	Day -3 prior to the single dose of enasidenib and at 0.5, 1, 2, 3, 4, 6, 8, 10, 24, 48, and 72 hours post-dose.
Phase 1: Maximum Concentration of Enasidenib After a Single Oral Dose on Day -3	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3). Plasma enasidenib was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL.	Day -3 prior to the single dose of enasidenib and at 0.5, 1, 2, 3, 4, 6, 8, 10, 24, 48, and 72 hours post-dose.
Phase 1: Time to Maximum Concentration (Tmax) of Enasidenib After a Single Oral Dose on Day -3	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3). Plasma enasidenib was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL.	Day -3 prior to the single dose of enasidenib and at 0.5, 1, 2, 3, 4, 6, 8, 10, 24, 48, and 72 hours post-dose.
Phase 1: Apparent Terminal Phase Half-life (t½) of Enasidenib After a Single Oral Dose on Day -3	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3). Plasma enasidenib was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. T1/2 was not calculated when the terminal elimination rate constant (λz) was not estimable.	Day -3 prior to the single dose of enasidenib and at 0.5, 1, 2, 3, 4, 6, 8, 10, 24, 48, and 72 hours post-dose.
Phase 1: AUC From Time Zero to 8 Hours Postdose (AUC0-8) of Enasidenib After Multiple Oral Doses	Plasma enasidenib was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. Area under the plasma concentration-time curve from time 0 to 8 hours post-dose (AUC0-8) was calculated using the linear trapezoidal rule.	Cycle 2 Day 1 at predose and 0.5, 1, 2, 3, 4, 6, and 8 hours post-dose.
Phase 1: AUC From Time Zero to 10 Hours Postdose (AUC0-10) of Enasidenib After Multiple Oral Doses	Plasma enasidenib was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. Area under the plasma concentration-time curve from time 0 to 10 hours post-dose (AUC0-10) was calculated using the linear trapezoidal rule.	Cycle 2 Day 1 at predose and 0.5, 1, 2, 3, 4, 6, 8, and 10 hours post-dose.
Phase 1: AUC From Time Zero to the Last Quantifiable Concentration (AUC0-t) of Enasidenib After Multiple Oral Doses	Plasma enasidenib was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. Area under the plasma concentration-time curve from time 0 to the last quantifiable concentration (AUC0-t) was calculated using the linear trapezoidal rule.	Cycle 2 Day 1 at predose and 0.5, 1, 2, 3, 4, 6, 8, and 10 hours post-dose.
Phase 1: Maximum Concentration (Cmax) of Enasidenib After Multiple Oral Doses	Plasma enasidenib was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL.	Cycle 2 Day 1 at predose and 0.5, 1, 2, 3, 4, 6, 8, and 10 hours post-dose.
Phase 1: Time to Maximum Concentration (Tmax) of Enasidenib After Multiple Oral Doses	Plasma enasidenib was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL.	Cycle 2 Day 1 at predose and 0.5, 1, 2, 3, 4, 6, 8, and 10 hours post-dose.
Phase 2: Area Under the Plasma Concentration Time Curve From Time Zero to 8 Hours Postdose (AUC0-8) of Enasidenib After Single and Multiple Oral Doses	Plasma enasidenib was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. Area under the plasma concentration-time curve from time 0 to 8 hours post-dose (AUC0-8) of enasidenib was calculated using the linear trapezoidal rule.	Cycle 1 Day 1 and Cycle 2 Day 1 at predose and 2, 4, 6, and 8 hours post-dose.
Phase 2: Area Under the Plasma Concentration Time Curve From Time Zero to 24 Hours Postdose (AUC 0-24) of Enasidenib After Single and Multiple Oral Doses	Plasma enasidenib was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. Area under the plasma concentration-time curve from time 0 to 24 hours post-dose (AUC0-24) was calculated using the linear trapezoidal rule.	Cycle 1 Day 1 and Cycle 2 Day 1 at predose and 2, 4, 6, 8, and 24 hours post-dose.
Phase 2: Area Under the Plasma Concentration Time Curve From Time Zero to the Last Quantifiable Concentration (AUC0-t) of Enasidenib After Single and Multiple Oral Doses	Plasma enasidenib was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. Area under the plasma concentration-time curve from time 0 to the last quantifiable concentration (AUC0-t) was calculated using the linear trapezoidal rule.	Cycle 1 Day 1 and Cycle 2 Day 1 at predose and 2, 4, 6, 8, and 24 hours post-dose.
Phase 2: Maximum Concentration (Cmax) of Enasidenib After Single and Multiple Oral Doses	Plasma enasidenib was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL.	Cycle 1 Day 1 and Cycle 2 Day 1 at predose and 2, 4, 6, 8, and 24 hours post-dose.
Phase 2: Time to Maximum Concentration (Tmax) of Enasidenib After Single and Multiple Oral Doses	Plasma enasidenib was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL.	Cycle 1 Day 1 and Cycle 2 Day 1 at predose and 2, 4, 6, 8, and 24 hours post-dose.
Phase 2: Apparent Terminal Phase Half-life (t1/2) of Enasidenib After Single and Multiple Oral Doses	Plasma enasidenib was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL.	Cycle 1 Day 1 and Cycle 2 Day 1 at predose and 2, 4, 6, 8, and 24 hours post-dose.
Phase 1: AUC From Time Zero to 8 Hours Postdose (AUC0-8) of AGI-16903 After a Single Oral Dose of Enasidenib on Day -3	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3). AGI-16903 is a primary metabolite of enasidenib. Plasma AGI-16903 was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. Area under the plasma concentration-time curve from time 0 to hour 8 post-dose (AUC 0-8) was calculated using the linear trapezoidal rule.	Day -3 prior to the single dose of enasidenib and at 0.5, 1, 2, 3, 4, 6, and 8 hours post-dose.
Phase 1: AUC From Time Zero to 10 Hours Postdose (AUC0-10) of AGI-16903 After a Single Oral Dose of Enasidenib on Day -3	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3). AGI-16903 is a primary metabolite of enasidenib. Plasma AGI-16903 was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. Area under the plasma concentration-time curve from time 0 to 10 hours post-dose (AUC0-10) was calculated using the linear trapezoidal rule.	Day -3 prior to the single dose of enasidenib and at 0.5, 1, 2, 3, 4, 6, 8, and 10 hours post-dose.
Phase 1: AUC From Time Zero to 24 Hours Postdose (AUC0-24) of AGI-16903 After a Single Oral Dose of Enasidenib on Day -3	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3). AGI-16903 is a primary metabolite of enasidenib. Plasma AGI-16903 was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. Area under the plasma concentration-time curve from time 0 to 24 hours post-dose (AUC0-24) was calculated using the linear trapezoidal rule.	Day -3 prior to the single dose of enasidenib and at 0.5, 1, 2, 3, 4, 6, 8, 10, and 24 hours post-dose.
Phase 1: AUC From Time Zero to 72 Hours Postdose (AUC0-72) of AGI-16903 After a Single Oral Dose of Enasidenib on Day -3	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3). AGI-16903 is a primary metabolite of enasidenib. Plasma AGI-16903 was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. Area under the plasma concentration-time curve from time 0 to 72 hours post-dose (AUC0-72) was calculated using the linear trapezoidal rule.	Day -3 prior to the single dose of enasidenib and at 0.5, 1, 2, 3, 4, 6, 8, 10, 24, 48, and 72 hours post-dose.
Phase 1: AUC From Time Zero to the Last Quantifiable Concentration (AUC0-t) of AGI-16903 After a Single Oral Dose of Enasidenib on Day -3	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3). AGI-16903 is a primary metabolite of enasidenib. Plasma AGI-16903 was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. Area under the plasma concentration-time curve from time 0 to the time of the last quantifiable concentration (AUC0-t) was calculated using the linear trapezoidal rule.	Day -3 prior to the single dose of enasidenib and at 0.5, 1, 2, 3, 4, 6, 8, 10, 24, 48, and 72 hours post-dose.
Phase 1: Maximum Concentration of AGI-16903 After a Single Oral Dose of Enasidenib on Day -3	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3). AGI-16903 is a primary metabolite of enasidenib. Plasma AGI-16903 was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL.	Day -3 prior to the single dose of enasidenib and at 0.5, 1, 2, 3, 4, 6, 8, 10, 24, 48, and 72 hours post-dose.
Phase 1: Time to Maximum Concentration (Tmax) of AGI-16903 After a Single Oral Dose of Enasidenib on Day -3	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3). AGI-16903 is a primary metabolite of enasidenib. Plasma AGI-16903 was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL.	Day -3 prior to the single dose of enasidenib and at 0.5, 1, 2, 3, 4, 6, 8, 10, 24, 48, and 72 hours post-dose.
Phase 1: Apparent Terminal Phase Half-life (t½) of AGI-16903 After a Single Oral Dose of Enasidenib on Day -3	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3). AGI-16903 is a primary metabolite of enasidenib. Plasma AGI-16903 was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. t1/2 was not calculated when the terminal elimination rate constant (λz) was not estimable.	Day -3 prior to the single dose of enasidenib and at 0.5, 1, 2, 3, 4, 6, 8, 10, 24, 48, and 72 hours post-dose.
Phase 1: AUC From Time Zero to 8 Hours Postdose (AUC0-8) of AGI-16903 After Multiple Oral Doses of Enasidenib	AGI-16903 is a primary metabolite of enasidenib. Plasma AGI-16903 was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. Area under the plasma concentration-time curve from time 0 to 8 hours post-dose (AUC0-8) was calculated using the linear trapezoidal rule.	Cycle 2 Day 1 at predose and 0.5, 1, 2, 3, 4, 6, and 8 hours post-dose.
Phase 1: AUC From Time Zero to 10 Hours Postdose (AUC0-10) of AGI-16903 After Multiple Oral Doses of Enasidenib	AGI-16903 is a primary metabolite of enasidenib. Plasma AGI-16903 was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. Area under the plasma concentration-time curve from time 0 to 10 hours post-dose (AUC0-10) was calculated using the linear trapezoidal rule.	Cycle 2 Day 1 at predose and 0.5, 1, 2, 3, 4, 6, 8, and 10 hours post-dose.
Phase 1: AUC From Time Zero to the Last Quantifiable Concentration (AUC0-t) of AGI-16903 After Multiple Oral Doses of Enasidenib	AGI-16903 is a primary metabolite of enasidenib. Plasma AGI-16903 was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. Area under the plasma concentration-time curve from time 0 to the last quantifiable concentration (AUC0-t) was calculated using the linear trapezoidal rule.	Cycle 2 Day 1 at predose and 0.5, 1, 2, 3, 4, 6, 8, and 10 hours post-dose.
Phase 1: Maximum Concentration (Cmax) of AGI-16903 After Multiple Oral Doses of Enasidenib	AGI-16903 is a primary metabolite of enasidenib. Plasma AGI-16903 was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL.	Cycle 2 Day 1 at predose and 0.5, 1, 2, 3, 4, 6, 8, and 10 hours post-dose.
Phase 1: Time to Maximum Concentration (Tmax) of AGI-16903 After Multiple Oral Doses of Enasidenib	AGI-16903 is a primary metabolite of enasidenib. Plasma AGI-16903 was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL.	Cycle 2 Day 1 at predose and 0.5, 1, 2, 3, 4, 6, 8, and 10 hours post-dose.
Phase 2: AUC From Time Zero to 8 Hours Postdose (AUC0-8) of AGI-16903 After Single and Multiple Oral Doses of Enasidenib	AGI-16903 is a primary metabolite of enasidenib. Plasma AGI-16903 was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. Area under the plasma concentration-time curve from time 0 to 8 hours post-dose (AUC0-8) was calculated using the linear trapezoidal rule.	Cycle 1 Day 1 and Cycle 2 Day 1 at predose and 2, 4, 6, and 8 hours post-dose.
Phase 2: AUC From Time Zero to 24 Hours Postdose (AUC0-24) of AGI-16903 After Single and Multiple Oral Doses of Enasidenib	AGI-16903 is a primary metabolite of enasidenib. Plasma AGI-16903 was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. Area under the plasma concentration-time curve from time 0 to 24 hours post-dose (AUC0-24) was calculated using the linear trapezoidal rule.	Cycle 1 Day 1 and Cycle 2 Day 1 at predose and 2, 4, 6, 8, and 24 hours post-dose.
Phase 2: AUC From Time Zero to the Last Quantifiable Concentration (AUC0-t) of AGI-16903 After Single and Multiple Oral Doses of Enasidenib	AGI-16903 is a primary metabolite of enasidenib. Plasma AGI-16903 was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. Area under the plasma concentration-time curve from time 0 to the last quantifiable concentration (AUC0-t) was calculated using the linear trapezoidal rule.	Cycle 1 Day 1 and Cycle 2 Day 1 at predose and 2, 4, 6, 8, and 24 hours post-dose.
Phase 2: Maximum Concentration (Cmax) of AGI-16903 After Single and Multiple Oral Doses of Enasidenib	AGI-16903 is a primary metabolite of enasidenib. Plasma AGI-16903 was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL.	Cycle 1 Day 1 and Cycle 2 Day 1 at predose and 2, 4, 6, 8, and 24 hours post-dose.
Phase 2: Time to Maximum Concentration (Tmax) of AGI-16903 After Single and Multiple Oral Doses of Enasidenib	AGI-16903 is a primary metabolite of enasidenib. Plasma AGI-16903 was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL.	Cycle 1 Day 1 and Cycle 2 Day 1 at predose and 2, 4, 6, 8, and 24 hours post-dose.
Phase 2: Apparent Terminal Phase Half-life (t1/2) of AGI-16903 After Single and Multiple Oral Doses of Enasidenib	AGI-16903 is a primary metabolite of enasidenib. Plasma AGI-16903 was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL.	Cycle 1 Day 1 and Cycle 2 Day 1 at predose and 2, 4, 6, 8, and 24 hours post-dose.
Phase 1 and 2: AUC From Time Zero to 8 Hours Postdose (AUC0-8) After Single and Multiple Oral Doses of Enasidenib 100 mg QD	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3) for single dose PK analysis, and underwent PK assessments on Cycle 2, Day 1 for multiple dose (steady-state) PK analysis. Participants in Phase 2 underwent PK assessments on Cycle 1, Day 1 for single dose analysis and on Cycle 2, Day 1 for multiple dose (steady-state) analysis. Plasma enasidenib was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. Area under the plasma concentration-time curve from time 0 to 8 hours post-dose (AUC0-8) was calculated using the linear trapezoidal rule.	Day -3 (Phase 1 only) predose and at 0.5, 1, 2, 3, 4, 6, and 8 hours post-dose or Cycle 1 Day 1 (Phase 2) and Cycle 2 Day 1 (Phase 1 & 2) at predose and 2, 4, 6, and 8 hours post-dose.
Phase 1 and 2: AUC From Time Zero to 24 Hours Postdose (AUC0-24) After Single and Multiple Oral Doses of Enasidenib 100 mg QD	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3) for single dose PK analysis, and underwent PK assessments on Cycle 2, Day 1 for multiple dose (steady-state) PK analysis. Participants in Phase 2 underwent PK assessments on Cycle 1, Day 1 for single dose analysis and on Cycle 2, Day 1 for multiple dose (steady-state) analysis. Plasma enasidenib was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. Area under the plasma concentration-time curve from time 0 to 24 hours post-dose (AUC0-24) was calculated using the linear trapezoidal rule.	Day -3 (Phase 1 only) predose and at 0.5, 1, 2, 3, 4, 6, 8, 10, and 24 hours post-dose or Cycle 1 Day 1 (Phase 2) and Cycle 2 Day 1 (Phase 1 & 2) at predose and 2, 4, 6, 8, and 24 hours post-dose.
Phase 1 and 2: Maximum Concentration (Cmax) After Single and Multiple Oral Doses of Enasidenib 100 mg QD	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3) for single dose PK analysis, and underwent PK assessments on Cycle 2, Day 1 for multiple dose (steady-state) PK analysis. Participants in Phase 2 underwent PK assessments on Cycle 1, Day 1 for single dose analysis and on Cycle 2, Day 1 for multiple dose (steady-state) analysis. Plasma enasidenib was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL.	Day -3 (Phase 1 only) predose and at 0.5, 1, 2, 3, 4, 6, 8, 10, 24, 48, and 72 hours post-dose or Cycle 1 Day 1 (Phase 2) and Cycle 2 Day 1 (Phase 1 & 2) at predose and 2, 4, 6, 8, and 24 hours post-dose.
Phase 1 and 2: Time to Maximum Concentration (Tmax) After Single and Multiple Oral Doses of Enasidenib 100 mg QD	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3) for single dose PK analysis, and underwent PK assessments on Cycle 2, Day 1 for multiple dose (steady-state) PK analysis. Participants in Phase 2 underwent PK assessments on Cycle 1, Day 1 for single dose analysis and on Cycle 2, Day 1 for multiple dose (steady-state) analysis. Plasma enasidenib was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL.	Day -3 (Phase 1 only) predose and at 0.5, 1, 2, 3, 4, 6, 8, 10, 24, 48, and 72 hours post-dose or Cycle 1 Day 1 (Phase 2) and Cycle 2 Day 1 (Phase 1 & 2) at predose and 2, 4, 6, 8, and 24 hours post-dose.
Phase 1 and 2: AUC From Time Zero to 8 Hours Postdose (AUC0-8) of AGI-16903 After Single and Multiple Oral Doses of Enasidenib 100 mg QD	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3) for single dose PK analysis, and underwent PK assessments on Cycle 2, Day 1 for multiple dose (steady-state) PK analysis. Participants in Phase 2 underwent PK assessments on Cycle 1, Day 1 for single dose analysis and on Cycle 2, Day 1 for multiple dose (steady-state) analysis. AGI-16903 is a primary metabolite of enasidenib. Plasma AGI-16903 was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. Area under the plasma concentration-time curve from time 0 to 8 hours post-dose (AUC0-8) was calculated using the linear trapezoidal rule.	Day -3 (Phase 1 only) predose and at 0.5, 1, 2, 3, 4, 6, and 8 hours post-dose or Cycle 1 Day 1 (Phase 2) and Cycle 2 Day 1 (Phase 1 & 2) at predose and 2, 4, 6, and 8 hours post-dose.
Phase 1 and 2: AUC From Time Zero to 24 Hours Postdose (AUC0-24) of AGI-16903 After Single and Multiple Oral Doses of Enasidenib 100 mg QD	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3) for single dose PK analysis, and underwent PK assessments on Cycle 2, Day 1 for multiple dose (steady-state) PK analysis. Participants in Phase 2 underwent PK assessments on Cycle 1, Day 1 for single dose analysis and on Cycle 2, Day 1 for multiple dose (steady-state) analysis. AGI-16903 is a primary metabolite of enasidenib. Plasma AGI-16903 was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL. Area under the plasma concentration-time curve from time 0 to 24 hours post-dose (AUC0-24) was calculated using the linear trapezoidal rule.	Day -3 (Phase 1 only) predose and at 0.5, 1, 2, 3, 4, 6, 8, 10, and 24 hours post-dose or Cycle 1 Day 1 (Phase 2) and Cycle 2 Day 1 (Phase 1 & 2) at predose and 2, 4, 6, 8, and 24 hours post-dose.
Phase 1 and 2: Maximum Concentration (Cmax) of AGI-16903 After Single and Multiple Oral Doses of Enasidenib 100 mg QD	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3) for single dose PK analysis, and underwent PK assessments on Cycle 2, Day 1 for multiple dose (steady-state) PK analysis. Participants in Phase 2 underwent PK assessments on Cycle 1, Day 1 for single dose analysis and on Cycle 2, Day 1 for multiple dose (steady-state) analysis. AGI-16903 is a primary metabolite of enasidenib. Plasma AGI-16903 was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL.	Day -3 (Phase 1 only) predose and at 0.5, 1, 2, 3, 4, 6, 8, 10, 24, 48, and 72 hours post-dose or Cycle 1 Day 1 (Phase 2) and Cycle 2 Day 1 (Phase 1 & 2) at predose and 2, 4, 6, 8, and 24 hours post-dose.
Phase 1 and 2: Time to Maximum Concentration (Tmax) of AGI-16903 After Single and Multiple Oral Doses of Enasidenib 100 mg QD	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3) for single dose PK analysis, and underwent PK assessments on Cycle 2, Day 1 for multiple dose (steady-state) PK analysis. Participants in Phase 2 underwent PK assessments on Cycle 1, Day 1 for single dose analysis and on Cycle 2, Day 1 for multiple dose (steady-state) analysis. AGI-16903 is a primary metabolite of enasidenib. Plasma AGI-16903 was measured using validated liquid chromatography-mass spectrometry methods (LC-MS/MS). The lower limit of quantification (LLOQ) in plasma was 1.00 ng/mL.	Day -3 (Phase 1 only) predose and at 0.5, 1, 2, 3, 4, 6, 8, 10, 24, 48, and 72 hours post-dose or Cycle 1 Day 1 (Phase 2) and Cycle 2 Day 1 (Phase 1 & 2) at predose and 2, 4, 6, 8, and 24 hours post-dose.
Phase 1: Percent Change From Baseline for Area Under the Effect Concentration Time Curve From Time 0 to 10 Hours Postdose (%BAUEC0-10) of 2-hydroxyglutarate (2-HG) on Day -3	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3). Plasma 2-HG was measured using qualified LC-MS/MS in order to characterize the pharmacodynamic (PD) effects of enasidenib; the LLOQ was 30.0 ng/mL. Area under the effect concentration time curve from time point zero (predose) up to 10 hours postdose (AUEC0-10) was calculated using the linear trapezoid rule. Percent change from Baseline for AUEC0-10 was calculated as (AUEC0-10 minus [Baseline*Tlast]) / (Baseline*Tlast) * 100, where Tlast corresponded to 10 hours and Baseline was equal to the average of the Screening and Day -3 (predose) 2-HG values. Data reported are the arithmetic mean and relative standard deviation expressed as a percentage.	Screening visit, Day -3 prior to the single dose of enasidenib and at 0.5, 1, 2, 3, 4, 6, 8, and 10 hours post-dose.
Phase 1: Minimum Percent Change From Baseline Response Value Post-dose Over 10 Hours (%BRmin) for 2-HG After a Single Oral Dose of Enasidenib on Day -3	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3). Plasma 2-HG was measured using qualified LC-MS/MS in order to characterize the pharmacodynamic (PD) effects of enasidenib; the LLOQ was 30.0 ng/mL. Minimum percent change from Baseline response value post-dose over 10 hours was calculated as: (minimum observed concentration post-dose over 10 hours [Rmin] - Baseline) / Baseline * 100. Baseline was equal to the average of the Screening and Day -3 (predose) 2-HG values. Data reported are the arithmetic mean and relative standard deviation expressed as a percentage.	Screening visit, Day -3 prior to the single dose of enasidenib and at 0.5, 1, 2, 3, 4, 6, 8, and 10 hours post-dose.
Phase 1: Time of Minimum Observed Concentration Over 72 Hours Postdose (Tmin) of 2-HG After a Single Oral Dose of Enasidenib on Day -3	The first 3 participants enrolled in each cohort of the dose escalation phase and the first 15 participants enrolled in each arm of Phase 1 Expansion received a single dose of enasidenib three days prior to starting the 28-day dosing regimen (Day -3). Plasma 2-HG was measured using qualified LC-MS/MS, the LLOQ was 30.0 ng/mL.	Day -3 prior to the single dose of enasidenib and at 0.5, 1, 2, 3, 4, 6, 8, 10, 24, 48, and 72 hours post-dose.
Phase 1: Percent Change From Baseline for Area Under the Effect Concentration Time Curve From Time 0 to 10 Hours Postdose of 2-HG After Multiple Oral Doses of Enasidenib	Plasma 2-HG was measured using qualified LC-MS/MS, the LLOQ was 30.0 ng/mL. Area under the effect concentration time curve from time point zero (predose) up to 10 hours postdose (AUEC0-10) was calculated using the linear trapezoid rule. Percent change from baseline for AUEC0-10 was calculated as: (AUEC0-10 minus [Baseline*Tlast]) / (Baseline*Tlast) * 100, where Tlast corresponded to 10 hours and Baseline was equal to the average of the Screening and Day -3 (predose) 2-HG values. Data reported are the arithmetic mean and relative standard deviation expressed as a percentage.	Cycle 1, Day 15 and Cycle 2, Day 1 at predose and 0.5, 1, 2, 3, 4, 6, 8, and 10 hours post-dose.
Phase 1: Minimum Percent Change From Baseline Response Value Post-dose Over 10 Hours (%BRmin) for 2-HG After Multiple Oral Doses of Enasidenib	Plasma 2-HG was measured using qualified LC-MS/MS, the LLOQ was 30.0 ng/mL. Minimum percent change from Baseline response value post-dose over 10 hours was calculated as: (minimum observed concentration post-dose over 10 hours [Rmin] - Baseline) / Baseline * 100. Baseline was equal to the average of the Screening and Day -3 (predose) 2-HG values. Data reported are the arithmetic mean and relative standard deviation expressed as a percentage.	Cycle 1, Day 15 and Cycle 2, Day 1 at predose and 0.5, 1, 2, 3, 4, 6, 8, and 10 hours post-dose.
Phase 1: Time of Minimum Observed Concentration Over 10 Hours Postdose (Tmin) of 2-HG After Multiple Oral Doses of Enasidenib	Plasma 2-HG was measured using qualified LC-MS/MS, the LLOQ was 30.0 ng/mL.	Cycle 1, Day 15 and Cycle 2, Day 1 at predose and 0.5, 1, 2, 3, 4, 6, 8, and 10 hours post-dose.

Collaborators and Investigators

• Sponsor: Celgene
• Collaborators: Agios Pharmaceuticals, Inc.
• Investigators: Study Director: Bristol-Myers Squibb, Bristol-Myers Squibb

Publications and helpful links

General Publications

• Stein EM, DiNardo CD, Fathi AT, Pollyea DA, Stone RM, Altman JK, Roboz GJ, Patel MR, Collins R, Flinn IW, Sekeres MA, Stein AS, Kantarjian HM, Levine RL, Vyas P, MacBeth KJ, Tosolini A, VanOostendorp J, Xu Q, Gupta I, Lila T, Risueno A, Yen KE, Wu B, Attar EC, Tallman MS, de Botton S. Molecular remission and response patterns in patients with mutant-IDH2 acute myeloid leukemia treated with enasidenib. Blood. 2019 Feb 14;133(7):676-687. doi: 10.1182/blood-2018-08-869008. Epub 2018 Dec 3.
• Stein EM, DiNardo CD, Pollyea DA, Fathi AT, Roboz GJ, Altman JK, Stone RM, DeAngelo DJ, Levine RL, Flinn IW, Kantarjian HM, Collins R, Patel MR, Frankel AE, Stein A, Sekeres MA, Swords RT, Medeiros BC, Willekens C, Vyas P, Tosolini A, Xu Q, Knight RD, Yen KE, Agresta S, de Botton S, Tallman MS. Enasidenib in mutant IDH2 relapsed or refractory acute myeloid leukemia. Blood. 2017 Aug 10;130(6):722-731. doi: 10.1182/blood-2017-04-779405. Epub 2017 Jun 6.
• Fathi AT, DiNardo CD, Kline I, Kenvin L, Gupta I, Attar EC, Stein EM, de Botton S; AG221-C-001 Study Investigators. Differentiation Syndrome Associated With Enasidenib, a Selective Inhibitor of Mutant Isocitrate Dehydrogenase 2: Analysis of a Phase 1/2 Study. JAMA Oncol. 2018 Aug 1;4(8):1106-1110. doi: 10.1001/jamaoncol.2017.4695.
• Pollyea DA, Tallman MS, de Botton S, Kantarjian HM, Collins R, Stein AS, Frattini MG, Xu Q, Tosolini A, See WL, MacBeth KJ, Agresta SV, Attar EC, DiNardo CD, Stein EM. Enasidenib, an inhibitor of mutant IDH2 proteins, induces durable remissions in older patients with newly diagnosed acute myeloid leukemia. Leukemia. 2019 Nov;33(11):2575-2584. doi: 10.1038/s41375-019-0472-2. Epub 2019 Apr 9.
• Quek L, David MD, Kennedy A, Metzner M, Amatangelo M, Shih A, Stoilova B, Quivoron C, Heiblig M, Willekens C, Saada V, Alsafadi S, Vijayabaskar MS, Peniket A, Bernard OA, Agresta S, Yen K, MacBeth K, Stein E, Vassiliou GS, Levine R, De Botton S, Thakurta A, Penard-Lacronique V, Vyas P. Clonal heterogeneity of acute myeloid leukemia treated with the IDH2 inhibitor enasidenib. Nat Med. 2018 Aug;24(8):1167-1177. doi: 10.1038/s41591-018-0115-6. Epub 2018 Jul 16.
• Amatangelo MD, Quek L, Shih A, Stein EM, Roshal M, David MD, Marteyn B, Farnoud NR, de Botton S, Bernard OA, Wu B, Yen KE, Tallman MS, Papaemmanuil E, Penard-Lacronique V, Thakurta A, Vyas P, Levine RL. Enasidenib induces acute myeloid leukemia cell differentiation to promote clinical response. Blood. 2017 Aug 10;130(6):732-741. doi: 10.1182/blood-2017-04-779447. Epub 2017 Jun 6.
• Shih AH, Meydan C, Shank K, Garrett-Bakelman FE, Ward PS, Intlekofer AM, Nazir A, Stein EM, Knapp K, Glass J, Travins J, Straley K, Gliser C, Mason CE, Yen K, Thompson CB, Melnick A, Levine RL. Combination Targeted Therapy to Disrupt Aberrant Oncogenic Signaling and Reverse Epigenetic Dysfunction in IDH2- and TET2-Mutant Acute Myeloid Leukemia. Cancer Discov. 2017 May;7(5):494-505. doi: 10.1158/2159-8290.CD-16-1049. Epub 2017 Feb 13.
• Stein EM, Fathi AT, DiNardo CD, Pollyea DA, Roboz GJ, Collins R, Sekeres MA, Stone RM, Attar EC, Frattini MG, Tosolini A, Xu Q, See WL, MacBeth KJ, de Botton S, Tallman MS, Kantarjian HM. Enasidenib in patients with mutant IDH2 myelodysplastic syndromes: a phase 1 subgroup analysis of the multicentre, AG221-C-001 trial. Lancet Haematol. 2020 Apr;7(4):e309-e319. doi: 10.1016/S2352-3026(19)30284-4. Epub 2020 Mar 5.
• Intlekofer AM, Shih AH, Wang B, Nazir A, Rustenburg AS, Albanese SK, Patel M, Famulare C, Correa FM, Takemoto N, Durani V, Liu H, Taylor J, Farnoud N, Papaemmanuil E, Cross JR, Tallman MS, Arcila ME, Roshal M, Petsko GA, Wu B, Choe S, Konteatis ZD, Biller SA, Chodera JD, Thompson CB, Levine RL, Stein EM. Acquired resistance to IDH inhibition through trans or cis dimer-interface mutations. Nature. 2018 Jul;559(7712):125-129. doi: 10.1038/s41586-018-0251-7. Epub 2018 Jun 27.
• Stein EM. Enasidenib, a targeted inhibitor of mutant IDH2 proteins for treatment of relapsed or refractory acute myeloid leukemia. Future Oncol. 2018 Jan;14(1):23-40. doi: 10.2217/fon-2017-0392. Epub 2017 Sep 18.
• de Botton S, Brandwein JM, Wei AH, Pigneux A, Quesnel B, Thomas X, Legrand O, Recher C, Chantepie S, Hunault-Berger M, Boissel N, Nehme SA, Frattini MG, Tosolini A, Marion-Gallois R, Wang JJ, Cameron C, Siddiqui M, Hutton B, Milkovich G, Stein EM. Improved survival with enasidenib versus standard of care in relapsed/refractory acute myeloid leukemia associated with IDH2 mutations using historical data and propensity score matching analysis. Cancer Med. 2021 Sep;10(18):6336-6343. doi: 10.1002/cam4.4182. Epub 2021 Aug 24.

Helpful Links

• BMS Clinical Trial Information
• BMS Clinical Trial Patient Recruiting

Study record dates

Study Major Dates

• Study Start (Actual): August 27, 2013
• Primary Completion (Actual): July 25, 2019
• Study Completion (Actual): October 31, 2023

Study Registration Dates

• First Submitted: July 31, 2013
• First Submitted That Met QC Criteria: August 1, 2013
• First Posted (Estimated): August 5, 2013

Study Record Updates

• Last Update Posted (Actual): February 12, 2024
• Last Update Submitted That Met QC Criteria: February 8, 2024
• Last Verified: February 1, 2024

More Information

Terms related to this study

• Keywords: AML; Phase I; MDS; Phase II; acute myeloid leukemia; hematologic malignancies; myelodysplastic syndrome; refractory AML; IDH2; AG-221; relapse AML
• Additional Relevant MeSH Terms: Neoplasms by Site; Hematologic Diseases; Neoplasms; Hematologic Neoplasms
• Other Study ID Numbers: AG-221-C-001; 2013-001784-23 (EudraCT Number)