RecruitingPhase 1Drug trialThiotepa-based Conditioning Regimen With De-escalated Post-graft Cyclophosphamide for Allogeneic Stem Cell Transplantation in Hematologic MalignanciesThis phase 1 trial will investigate the safety and effectiveness of Thiotepa, Busulfan, and Fludarabine (TBF) conditioning regimen with post-transplant cyclophosphamide (PTCy) in HLA-matched related or unrelated donor allogeneic stem cell transplantation (alloSCT).