<qa>  What is the non-myeloablative conditioning regimen?OUTLINE: Patients receive a non-myeloablative conditioning regimen comprising fludarabine IV over 30 minutes on days -8 to -4, cyclophosphamide IV over 2 hours on days -3 to -2, and anti-thymocyte globulin ATG IV over at least 4 hours on days -2 to -1. Patients unable to tolerate ATG may receive methylprednisolone IV over 1 hour on days -3 to -1. 