Importantly, circulating progranulin concentrations in the metabolic syndrome group were greater than those in the control group, and almost reached a significant level (199.55 [179.33, 215.53] vs. 185.10 [160.30, 204.90], P = 0.051), whereas there was no significant difference in serum CTRP3 levels. Here, C1QTNF3 is linked to metabolic syndrome.