OUTLINE: Patients receive oral busulfan four times a day on days -8 to -5, cyclophosphamide IV over 1 hour on days -4 to -1, and methylprednisolone IV over 1 hour every 12 hours on days -2 to 0. CD34+ stem cell augmented donor bone marrow is infused on day 0. Methylprednisolone is administered IV over 1 hour on days 5-16, and then tapered. Patients are followed every 6 months for 1 year and then annually thereafter.