 - Determine whether increasing the intensity of a nonmyeloablative conditioning regimen comprising fludarabine and total body irradiation allows achievement of a donor T-cell chimerism level of 40 on day 28 post-transplantation in 90 or more of patients with chronic myelogenous leukemia undergoing allogeneic peripheral blood stem cell transplantation and immunosuppression comprising cyclosporine and mycophenolate mofetil. 