- Determine the safety of nonmyeloablative preparative regimen comprising cyclophosphamide, fludarabine, and total-body irradiation with or without anti-thymocyte globulin, in terms of non-relapse mortality at day 100 post-transplantation, in patients with advanced hematologic malignancies, metastatic breast cancer, or renal cell cancer who are undergoing umbilical cord blood transplantation from an unrelated donor.