Overall survival (OS) curves. (A) OS curves for the cohort stratified by donor type (MDS indicates matched sibling donor; and UD, unrelated donor). (B) OS curves for the cohort stratified by transplantation comorbidity index (HSCT-CI; HSCT-CI 0-1 vs HSCT-CI ≥ 2). (C) OS curves for the cohort stratified by recipient age (recipient age < 50 years vs ≥ 50 years). (D) OS curves for the cohort stratified by stem cell source (PBSC indicates peripheral blood progenitor cells).