RecruitingPhase 2Drug trialFludarabine and Intermediate-dose TBI Followed by PTCy in Patients Undergoing Allo Transplant for Heme MalignanciesThe Flu-TBI 800 trial is a prospective, single-arm, multicenter, interventional phase 2 study to evaluate whether fludarabine plus intermediate-dose total body irradiation (TBI 800 cGy) with post-transplant cyclophosphamide (PTCy) (experimental regimen) improves the 1-year survival of allogeneic stem cell transplant recipients.