This study is being done to evaluate if the combination of ASTX727 and venetoclax works better than ASTX727 alone at decreasing the signs and symptoms of bone marrow cancer, known as myelodysplastic/myeloproliferative neoplasm (MDS/MPN).
We are doing this study because we want to find out if this approach is better or worse than the usual approach for bone marrow cancer called chronic myelomonocytic leukemia (CMML) or a less common form called non-CMML MDS/MPN. The usual approach is defined as care most people get.