P values are reported only in cases when the difference was statistically significant.

MSD indicates HLA matched sibling donor; BMT, BM transplantation; AA, aplastic anemia; MAC, myeloablative conditioning; PDN, prednisone or equivalent dose of another corticosteroid (most commonly, IV methylprednisolone); SIRO, sirolimus; mm, HLA mismatch; and IS, immunosuppression.