OUTLINE: Patients receive fludarabine IV over 30 minutes on days -8 through -4 and cyclophosphamide IV over 1 hour on days -3 and -2. Immediately following each daily donor leukapheresis, patients receive allogeneic peripheral blood stem cells (PBSC) IV over 15 minutes beginning on day 0 and continuing until the target cells are collected. Patients receive filgrastim (G-CSF) subcutaneously beginning on day 5 and continuing until blood counts recover.