Receiver operating characteristic (ROC) curve analysis revealed that serum FGL-1 or TG individually showed a non-ideal area under the curve (AUC) of < 0.7 in distinguishing patients with DbCM from those with T2DM (Fig. 2A), although the use of serum FGL-1 could differentiate patients with DbCM from HCs with an AUC of 0.742 (Fig. 2B). This evidence concerns the gene FGL1 and type 2 diabetes mellitus.