Study of Azacytidine Combined With Lenalidomide As Maintenance Therapy Based on MRD Monitoring in AML

In this study, elderly or unfit for intensive therapy AML patients who had achieved complete remission(CR) after remission-induction and consolidation chemotherapy were assigned to 3 Arms: (1) Maintenance therapy with AZA combined with LEN（AZA+LEN）: AZA 50mg/m² per day for days 1-5 and LEN 10mg per day orally for days 6-26 , every 28 days for up to 12 cycles or progression; (2) Maintenance therapy with AZA only: AZA 50mg/m² per day for days 1-5, every 28 days for up to 12 cycles or progression; (3) Observation or with supporting therapy. MRD will be assessed by flow cytometry and molecular techniques. The efficacy and safety of the 3 Arms will be evaluated in this study.