- Group A (malignant disease ): Patients undergo total body irradiation (TBI) once on day -8 and twice daily on days -7 to -4. Male patients with acute lymphocytic leukemia (ALL) undergo radiotherapy boost to testes. Patients receive cyclophosphamide (CTX) IV on days -3 and -2 and methylprednisolone (MePRDL) IV and anti-thymocyte globulin (ATG) IV on days -3 to -1.