Frequencies of MIF high-expression -794 CATT7 containing genotypes were increased in patients with grade III-IV acute GVHD (aGVHD) (36.8%) compared with patients that did not develop aGVHD (5.8%) and patients with grade II aGVHD (0%), (p=0.0019, 0.0080 respectively). This evidence concerns the gene MIF and acute graft versus host disease.