PROTOCOL OUTLINE: Patients receive filgrastim (G-CSF) SC daily until peripheral blood stem cells (PBSC) are collected. On the fifth day of G-CSF therapy, PBSC are collected. Patients undergo plasmapheresis on days -9 to -7. Patients receive cyclophosphamide IV on days -6 to -3 and total lymphoid irradiation on day -1. PBSC are reinfused on day 0. Following PBSC reinfusion, patients receive prophylaxis with oral prednisone or methylprednisolone IV on days -1 to 28, antithymocyte globulin IV on days 1-3, and cyclosporine every 12 hours on days 1-60.