CD34 and acute myeloid leukemia: To compare the efficacy of both approaches, we retrospectively evaluated the outcomes of patients with intermediate or high-risk AML in first complete remission (CR1) who underwent myeloablative allo-HCT with either in vivo TCD with ATG within the European group for Blood and Marrow Transplantation (EBMT) centers or ex vivo TCD CD34 selected (CD34+) graft at the Memorial Sloan Kettering Cancer Center (MSKCC).