The effect of higher FOXP3 mRNA expression by recipient pre‐transplant CD4+ T cells on leukaemia relapse was analysed in a series of 106 patients who received allogeneic haematopoietic stem cell transplantation after myeloablative conditioning with or without antithymocyte globulin (ATG) due to acute leukaemia in 1st or 2nd complete remission. The gene discussed is FOXP3; the disease is leukemia.