RecruitingPhase 2Drug trialDose-Expansion Study of Low Dose Post-Transplant Cyclophosphamide/Tacrolimus/Ruxolitinib for Graft-versus-Host Disease (GVHD) Prophylaxis in Myeloablative Allogeneic Peripheral Blood Stem Cell TransplantationThis is an open label, non-randomized, multicenter, pilot, dose expansion study of low dose post-transplant cyclophosphamide (25 mg/kg on Days +3 and +4)/tacrolimus/ruxolitinib in the setting of myeloablative conditioning (MAC) allogeneic peripheral blood stem cell transplantation (PBSCT).