Umbilical Cord Blood Transplantation In Patients With Hematologic Malignancies Using A Myeloablative Preparative Regimen

In this study, participants with high-risk hematologic malignancies undergoing hematopoietic cell transplantation (HCT), who do not have a suitable human leukocyte antigen (HLA)-matched related/sibling donor (MSD), matched unrelated donor (MURD) or killer-immunoglobulin receptors (KIR) ligand mismatched haploidentical donor identified, will receive an umbilical cord blood transplantation (UCBT) using a myeloablative preparative regimen. The preparative regimen includes fludarabine (75 mg/m2), fractionated total body irradiation (TBI) (10.0 Gy), and cyclophosphamide (120mg/kg) with mesna. Fludarabine will be given once a day at 25 mg/m2 for three days on day -10 to day -8, TBI will be given twice a day at 150 cGy for four days on day -7 to day -4, and cyclophosphamide will be given once a day for at 60mg/kg for two days on day -3 and day -2. Post-transplantation immunosuppression with cyclosporine and MMF will begin on day -3. Cord Blood infusion will occur on day 0 and G-CSF will start on day +1.