Acute GVHD: graded according to organ-specific symptoms within 100 days after HSCT.

Abbreviations: AML, acute myelogenous leukemia; ALL, acute lymphoblastic leukemia; ATG, antithymocyte globulins; BM, bone marrow; MDS, myelodysplastic syndrome; CML, chronic myelogenous leukemia; PBSC, peripheral blood stem cell; TBI, total body irradiation; SAA, severe aplastic anemia; MAC, myeloablative conditioning; RIC, reduced-intensity conditioning.