Based on these data, we seek to safely achieve objective clinical regression of metastatic RCC by the following new transplant approach. (1) The allograft will be administered after a low intensity, outpatient induction chemotherapy regimen consisting of pentostatin and cyclophosphamide. This regimen is intended to provide sufficient host immune T cell depletion, and as such, a conventional preparative regimen will not be administered. (2) To avoid mixed chimerism for rapid potentiation of graft-versus-tumor (GVT) effects, a growth colony stimulating factor (G-CSF) mobilized allograft will be augmented with donor lymphocyte infusion at day 14 post-transplant consisting of Th2.rapa cells.