Pharmacokinetics, Safety, and Efficacy of ASTX727 in Combination With Venetoclax in Acute Myeloid Leukemia (AML)

Inclusion Criteria:

   1. Participant must be 18 years of age or older.

   2. Histological confirmation of newly diagnosed AML by World Health Organization (WHO)
   2016 criteria.

   3. Projected life expectancy of at least 3 months.

   4. Participants must be considered ineligible for intensive induction chemotherapy
   defined by the following: a) Age 75 years or older, or b) Age 18 to 74 years with at
   least one of the following comorbidities: i) Severe cardiac disorder (eg, congestive
   heart failure requiring treatment, ejection fraction ≤50%, or chronic stable angina),
   ii) Severe pulmonary disorder (eg, diffusing lung capacity for carbon monoxide DLCO
   ≤65% or forced expiratory volume in 1 second [FEV1] ≤65%), iii) Creatinine clearance
   ≥30 mL/min to <45 mL/min, iv) Moderate hepatic impairment with total bilirubin >1.5 to
   ≤3.0 × upper limit of normal (ULN), v) Phase 1: Eastern Cooperative Oncology Group
   (ECOG) Performance Status of 2 (participants with ECOG ≥3 are not eligible); Phase 2,
   Parts A and B: ECOG Performance Status of 2 or 3 (participants with ECOG 4 are not
   eligible).

   5. Phase 1: ECOG Performance Status of 0-2; Phase 2, Parts A and B: ECOG 0-3.

   6. Women of child-bearing potential (according to recommendations of the Clinical Trial
   Facilitation Group [CTFG]) must not be pregnant or breastfeeding and must have a
   negative pregnancy test at screening.

   7. Participants and their partners with reproductive potential must agree to use a highly
   effective contraceptive measure during the study and for 3 months after the last dose
   of study treatment, including refraining from sperm donation. Effective contraception
   includes methods such as oral contraceptives or double-barrier method (eg, use of a
   condom AND diaphragm, with spermicide).

   8. Capable of giving legally effective informed consent, which includes compliance with
   the requirements and restrictions listed in the informed consent form and protocol,
   and willing to participate in the study.

Exclusion Criteria:

   1. History of myeloproliferative neoplasm including myelofibrosis, essential
   thrombocythemia, polycythemia vera, chronic myeloid leukemia with or without BCR-ABL1
   translocation and AML with BCR-ABL1 translocation.

   2. The following karyotype abnormalities: t(8;21), inv(16) or t(15;17), or other acute
   promyelocytic leukemia variants that remain sensitive to all-trans retinoic acid
   (ATRA) therapy.

   3. Known active central nervous system involvement from AML.

   4. Known human immunodeficiency virus (HIV) infection (due to potential drug-drug
   interactions between antiretroviral medications and venetoclax). Human
   immunodeficiency virus testing will be performed at Screening, only if indicated per
   local guidelines or institutional standards.

   5. Known active hepatitis B or C infection (detectable viral load). Hepatitis B or C
   testing will be performed at Screening, only if indicated per local guidelines or
   institutional standards.

   6. Severe hepatic impairment defined as: bilirubin >1.5×upper limit of normal (ULN) for
   participants ≥75 years or >3×ULN for participants <75 years; or aspartate
   aminotransferase (AST)/serum glutamic oxaloacetic transaminase (SGOT) or alanine
   aminotransferase (ALT)/serum glutamic pyruvic transaminase (SGPT) >3×ULN (unless
   considered to be due to leukemic organ involvement).

   7. Severe renal impairment defined as: calculated creatinine clearance or glomerular
   filtration rate <30 mL/min.

   8. A malabsorption syndrome or other condition that precludes enteral route of
   administration.

   9. Cardiovascular disability status of New York Heart Association Class >2. Class 2 is
   defined as cardiac disease in which patients are comfortable at rest but ordinary
   physical activity results in fatigue, palpitations, dyspnea, or anginal pain.

10. Chronic respiratory disease that requires continuous oxygen, or significant history of
   renal, neurologic, psychiatric, endocrinologic, metabolic, immunologic, hepatic,
   cardiovascular disease, any other medical condition or known hypersensitivity to any
   of the study medications that in the opinion of the investigator would adversely
   affect his/her participating in this study.

11. Clinically significant uncontrolled systemic infection requiring therapy (viral,
   bacterial, or fungal).

12. History of other malignancies prior to study entry, with the exception of adequately
   treated in situ carcinoma of the breast or cervix uteri; localized basal cell
   carcinoma or squamous cell carcinoma of the skin; previous malignancy confined and
   surgically resected (or adequately treated and controlled with other modalities); and
   any early stage malignancy for which no definitive therapy is required.

13. White blood cell (WBC) count >25,000/μL (Hydroxyurea treatment is permitted to meet
   this criterion).

14. Treatment with the following: a) A hypomethylating agent (azacitidine or decitabine),
   or venetoclax including prior treatment for myelodysplastic syndrome (MDS), b)
   Chimeric Antigen Receptor (CAR)-T cell therapy, c) Investigational therapies for MDS
   or AML.

15. Participants who cannot discontinue concomitant prophylactic antifungal therapy with
   CYP3A inhibitor activity or other concomitant medications with moderate or strong
   CYP3A inhibitor activity ≥7 days or 5 half-lives, whichever is greater, prior to cycle
   1 day 1 (C1D1).

16. Participants who cannot discontinue concomitant drugs that are strong CYP3A or P-gp
   inhibitors ≥7 days or 5 half-lives, whichever is greater, prior to C1D1.

17. Participants who cannot avoid concomitant drugs known as moderate or strong CYP3A
   inducers.

18. Current participation in another research study requiring interventions such as drug
   therapy or study procedures.

19. Known or suspected hypersensitivity to decitabine, cedazuridine, venetoclax, or any of
   their excipients.

20. Known significant mental illness or other condition such as active alcohol or other
   substance abuse or addiction that, in the opinion of the investigator, predisposes the
   participant to high risk of noncompliance with the protocol.

21. Participants who consume grapefruit, grapefruit products, Seville oranges (including
   marmalade containing Seville oranges) or starfruit ≤7 days prior to C1D1.