A Single-arm, Prospective Study of TBI + BUMEL As a Conditioning Regimen for Salvage HSCT in Patients with R/R AML

"1. TBI+BUMEL (IBM) Conditioning Regimen Day -7: Semustine (Me-CCNU) 250mg/m², orally, Day -7; Day -6: Total Body Irradiation (TBI) 4Gy, in two parts, Day -6; Day -5 to Day -4: Busulfan (Bu) 3.2mg/kg/day, administered in four divided doses, IV infusion; Day -3 to Day -2: Melphalan (Mel) 50mg/m²/day, IV infusion~2. Donor Stem Cell Infusion (Hematopoietic Stem Cell Transplantation) Day 0: Intravenous infusion of donor hematopoietic stem cells (MNC ≥ 8×10⁸/kg, CD34+ cells ≥ 4×10⁶/kg)."