ROC analysis confirmed the diagnostic value of the five core genes for T2DM: TRAF6 (AUC = 0.758), PTEN (AUC = 0.662), MDM2 (AUC = 0.603), EGFR (AUC = 0.555), and CCL5 (AUC = 0.522) (Figure 3F). The gene discussed is CCL5; the disease is type 2 diabetes mellitus.