A Study of BGB-11417 in Participants With Myeloid Malignancies

The study will determine the safety, tolerability, recommended Phase 2 dose (RP2D) and preliminary efficacy of BGB-11417 as monotherapy and in combination with azacitidine in participants with acute myeloid leukemia (AML) and myelodysplastic syndrome (MDS)or MDS/myeloproliferative neoplasm (MPN) .

Key Inclusion Criteria: 1. Confirmed diagnosis of one of the following by 2016 World Health Organization criteria: * AML, nonacute promyelocytic leukemia * MDS * MDS/MPN 2. Eastern Cooperative Oncology Group performance status of 0 to 2. 3. Adequate organ function defined as: * Creatinine clearance ≥ 50 milliliters/minute (mL/min) (or between 30 and 49 mL/min in unfit AML cohort) * Adequate liver function 4. Life expectancy of \> 12 weeks. 5. Ability to comply with the requirements of the study. Key Exclusion Criteria: 1. A diagnosis of acute promyelocytic leukemia. 2. History of prior malignancy, with the exception of either a history of MDS or MDS/MPN that has transformed to AML, or other prior malignancy that was treated with a full curative intent and no evidence of recurrence within the past 2 years (eg, localized skin cancer, superficial bladder cancer, carcinoma in situ of the cervix or breast, or localized Gleason score ≤ 6 prostate cancer) 3. Antecedent MPN including myelofibrosis, essential thrombocytosis, polycythemia vera, or chronic myelogenous leukemia with or without BCR-ABL1 translocation and AML with BCR-ABL1 translocation. 4. Prior therapy with a B-cell lymphoma-2 inhibitor 5. Known central nervous system involvement by leukemia. Note: Other protocol defined Inclusion/Exclusion criteria may apply.