RecruitingPhase 2Drug trialOptimizing GVHD Prophylaxis After Allogeneic Hematopoietic Cell TransplantationThis study will compare post-transplant health-related quality of life following the use of standard versus attenuated dose of post-transplant cyclophosphamide in addition to two-drug graft-versus-host disease (GVHD) prophylaxis among recipients of allogeneic hematopoietic stem cell transplant.