A Phase 3, Randomized, Controlled, Open-label, Clinical Study of Pevonedistat Plus Azacitidine Versus Single-Agent Azacitidine as First-Line Treatment for Patients With Higher-Risk Myelodysplastic Syndromes, Chronic Myelomonocytic Leukemia, or Low-Blast Acute Myelogenous Leukemia

The purpose of this study is to determine whether the combination of pevonedistat and azacitidine improves event-free survival (EFS) when compared with single-agent azacitidine. (An event is defined as death or transformation to AML in participants with MDS or CMML, whichever occurs first, and is defined as death in participants with low-blast AML).