DPP4 and Insulin resistance: However, no significant association of DPP4 activity with glucose metabolism was found, such as the fasting and the postprandial plasma glucose levels, serum insulin levels, homeostatic model assessment (HOMA)-insulin sensitivity, and HOMA-insulin resistance, and HOMA-β, in various DPP4 mutations carriers from this young cohort (age less than 30 years old).