 IMMUNOSUPPRESSION: Patients receive cyclosporine orally PO or IV every 12 hours on days -3 to 180 followed by a taper until day 365 in the absence of GVHD. Beginning 4-6 hours after completion of allogeneic PBSCT, patients receive mycophenolate mofetil PO every 8 hours on days 0 to 100 followed by a taper until day 156 in the absence of GVHD. 