Although visfatin/MCP-1 and leptin/MCP-1 indexes were correlated with several clinical parameters of T2DM, the diagnostic performance of these indexes were not better when compared with MCP-1 levels (AUC = 0.71 and 0.64 vs. 0.79, respectively) (Fig. 2c, d). Here, NAMPT is linked to type 2 diabetes mellitus.