VA as Maintenance Therapy Post Allo-HSCT in MDS and AML

Inclusion Criteria: * The patient should, in the investigator's opinion, be able to meet all clinical trial requirements. * The patient is willing and able to adhere to the study visit schedule and other protocol requirements. * Patients aged ≥18 years with a diagnosis of MDS or AML according to World Health Organization criteria (WHO) who had undergone alloSCT with myeloablative or reduced-intensity conditioning regimens were eligible. Related and unrelated donors were permitted. * Patients should be in morphologic complete remission (CR; ie, ≤5% bone marrow blasts) with absolute neutrophil counts ≥1.0×10\^9 /L and platelets ≥ 75×10\^ 9 /L before treatment. Exclusion Criteria: * Active or uncontrolled infections requiring systemic treatment within 14 days before enrollment. * Any instability of systemic disease, including but not limited to severe cardiac, liver, kidney, or metabolic disease need therapy. * Pregnant or lactating women.