Graft‐versus‐host disease and graft‐versus‐leukaemia effects in secondary acute myeloid leukaemia: a retrospective, multicentre registry analysis from the Acute Leukaemia Working Party of the EBMT

Summary We assessed the susceptibility of secondary acute myeloid leukaemia (sAML) to graft‐versus‐leukaemia effects. Data from 2414 sAML patients in first (n = 2194) or second (n = 220) complete remission were included. They were given grafts from human leucocyte antigen (HLA)‐matched sibling (MSD, n = 1085), 10/10 unrelated donor (MUD, n = 1066) or 9/10 mismatched unrelated donor (MMUD, n = 263). The 100‐day incidence of grade II‐IV acute graft‐versus‐host disease (GVHD) was 25% while 2‐year incidence of chronic GVHD was 38%. Relapse rates declined steadily by duration of follow‐up and were significantly lower in patients with chronic GVHD (P