Telomere length and severe acute graft-versus-host disease outcomes. (A) Cumulative incidence of grade 3-4 acute GVHD after transplantation by telomere length quartiles; death without grade 3-4 acute GVHD was used as a competing risk. (B-C) Overall survival and cumulative incidence of nonrelapse mortality, respectively, according to telomere length quartiles after onset of grade 3-4 acute GVHD in patients age 40 or older.