In both the diabetic and the combined diabetes and control groups, kallistatin levels correlated with gamma-glutamyltransferase (GGT) (r = 0.27, p = 0.04, and r = 0.25, p = 0.03 respectively), and inversely with bilirubin levels in the combined groups only, r = -0.22, p = 0.04. This evidence concerns the gene SERPINA4 and diabetes mellitus.