- To assess the percentage of patients with hematological malignancies or renal cell carcinoma who achieve > 90% donor T-cell chimerism at 30 days after treatment with reduced-intensity conditioning comprising low-dose anti-thymocyte globulin, low-dose cyclophosphamide, busulfan, and fludarabine phosphate followed by allogeneic peripheral blood progenitor cell transplantation from a matched related donor.