For all tables: www.Clinicaltrials.gov website, accessed on April, 2015. Keywords: acute leukemia and relapse (selected from 1419 studies). Other terms searched: “allogeneic transplant” and “randomized” (317 studies), “WT-1” (186 studies), and “NK cell” and “leukemia” (299 studies). Only trials listed as “recruiting” were included.

AML indicates acute myelogenous leukemia; MDS, myelodysplastic syndrome; HSCT, hematopoietic stem cell transplant; NK, natural killer; IL-2, interleukin-2; TBI, total body irradiation; GVHD, graft-versus-host disease; CR, complete remission; EFS, event-free survival; BMT: blood and marrow transplantation; and SCT, stem cell transplant.