OUTLINE: Patients receive fludarabine IV over 30-60 minutes on days -7 to -4, cyclophosphamide IV over 30 minutes on days -7 to -5, and cytarabine IV over 2 hours on days -4 and -3. Allogeneic peripheral blood stem cells are infused on day 0. Filgrastim (G-CSF) is administered IV over 1 hour or subcutaneously beginning on day 1 and continuing until blood counts recover. Patients are followed weekly until day 60 and then monthly for 10 months.