FLT3 and acute myeloid leukemia: FMS-like tyrosine kinase 3 inhibitors for FLT3-ITD-positive AML [38] or prophylactic azacitidine and donor lymphocyte infusions [39] after allo-SCT may become also a new standard of care in the future for both clofarabine/fludarabine-busulfan based RIC regimen allo-SCT.