- AHSCT with reduced-intensity or non-myeloablative conditioning: Patients achieving partial response or stable disease after salvage therapy receive fludarabine phosphate IV over 30 minutes on days -6 to -2; melphalan IV over 15 minutes on days -6 and -5; and undergo AHSCT on day 0 (reduced-intensity conditioning). Patients achieving complete response after salvage therapy receive fludarabine phosphate IV over 30 minutes on days -6 to -2; cyclophosphamide IV over 15 minutes on day -6; total-body irradiation over 20-30 minutes on day -1; and undergo AHSCT on day 0 (non-myeloablative conditioning).