M15-531: This phase II trial is evaluating Azacitidine alone and in combination with Venetoclax in patients with previously untreated Myelodysplastic Syndromes (MDS)A Phase 1b Dose Escalation Study Evaluating the Safety and Pharmacokinetics of Venetoclax in Combination With Azacitidine in Subjects With Treatment-Naïve Higher-Risk Myelodysplastic Syndromes (MDS)

Exclusion

• Participant has received prior therapy for MDS. (Prior supportive care in form of transfusions or growth factors, etc., is not considered prior therapy).
• Participant has received prior therapy with a BCL-2 Homology 3 (BH3) mimetic.

• Participant has a diagnosis other than previously untreated de novo MDS (as defined in the protocol) including:

  • MDS with IPSS risk categories Low or Int-1 (overall IPSS score < 1.5)
  • Therapy-related MDS (t-MDS).
  • MDS evolving from a pre-existing myeloproliferative neoplasm (MPN).
  • MDS/MPN including chronic myelomonocytic leukemia (CMML), atypical chronic myeloid leukemia (CML), juvenile myelomonocytic leukemia (JMML) and unclassifiable MDS/MPN.
• Participant has received allogeneic Hematopoietic Stem Cell Transplantation (HSCT) or solid organ transplantation.
• Participant has received a live attenuated vaccine within 4 weeks prior to the first dose of study drug.