In a cohort of 1,139 KTRs (412 anemic), during a median of 5.5 year follow-up, the presence of severe anemia (hemoglobin [Hb] concentration of <11 g/dL) was significantly associated with death-censored graft failure, the association being weaker for mild anemia.2 This evidence concerns the gene GSTM1 and anemia (phenotype).