INSL3 and type 2 diabetes mellitus: The receiver operating characteristic analysis clarified that INSL3 could discriminate DN patients from T2DM patients and healthy controls with the area under the curves (AUC) of INSL3 of 0.7017 (95% CI = 0.6284~0.7751) and 0.8176 (95% CI = 0.7529~0.8824), respectively.