RecruitingBiological interventionAdapt NK for High Risk Myeloid Diseases as Bridge to Allo HSCTThis is a multi-institutional Phase I/II study of an allogeneic KIR-HLA mismatched NK cell infusion (AdaptNK) and a short course of subcutaneous interleukin-2 (IL-2) administered after lymphodepleting chemotherapy \[cyclophosphamide (CY)/fludarabine (FLU)\] in patients with relapsed or refractory acute myelogenous leukemia (AML). AdaptNK is a natural killer (NK) cell product that is enriched for NK cells with an "adaptive", or human cytomegalovirus (CMV)-induced, phenotype.