A Multi-phase, Dose-Escalation Followed by an Open-label, Randomized, Crossover Study of Oral ASTX030 (Cedazuridine and Azacitidine Given in Combination) Versus Subcutaneous Azacitidine in Subjects With Myelodysplastic Syndromes (MDS), Chronic Myelomonocytic Leukemia (CMML), or Acute Myeloid Leukemia (AML)

Study ASTX030-01 is designed to move efficiently from Phase 1 to Phase 3. Phase 1 consists of an open-label Dose Escalation Stage (Stage A) using multiple cohorts at escalating dose levels of oral cedazuridine and azacitidine (only one study drug will be escalated at a time) followed by a Dose Expansion Stage (Stage B) of ASTX030. Phase 2 is a randomized open-label crossover study to compare oral ASTX030 to subcutaneous (SC) azacitidine. Phase 3 is a randomized open-label crossover study comparing the final oral ASTX030 dose to SC azacitidine. The duration of the study is expected to be approximately 48 months.