In their study, they found that among 50 patients with type 2 diabetes mellitus and a mean eGFR level of 80 mL/min/1.73 m2, serum hepcidin and ferritin were higher when compared to the control group (where the mean eGFR was 89 mL/min/1.73 m2), while serum iron was significantly lower. This evidence concerns the gene HAMP and diabetes mellitus.