In type 1 diabetes ApN correlated significantly (P < 0.05) with HCY (r = 0.57), CrCL (r = −0.61), AER (r = 0.61), and creatinine (r = 0.40), and in type 2 diabetes it correlated with HCY (r = 0.25), CrCl (r = −0.22), creatinine (r = 0.20), and diastolic BP (r = −0.19). Here, ANPEP is linked to type 2 diabetes mellitus.