The purpose of this study is to assess the safety and effectiveness in the real-world setting among participants who are treated with Azacitidine in accordance with the China Product Label.

This study will have participants both enrolled retrospectively and prospectively for azacitidine (AZA) treatment.

Inclusion Criteria:

• Documented diagnosis of intermediate-2/ high-risk myelodysplastic syndromes (MDS) or chronic myelomonocytic leukemia (CMML) or acute myeloid leukemia (AML) with 20-30% bone marrow blasts and multi-lineage dysplasia
• Initiated azacitidine (AZA) treatment per approved China Product Label after April 2017

Exclusion Criteria:

• Contraindicated for the use of AZA according to China Product Label
• Simultaneously participating in a treatment intervention study

Other protocol-defined inclusion/exclusion criteria apply.

The study population will consist of participants enrolled retrospectively, who initiate azacitidine (AZA) before enrollment and participants enrolled prospectively, who initiate AZA initiation at enrollment.