The serum OGN levels were significantly higher in T2D patients (n = 136, 57% males) than in control subjects (n = 75, 36% males) (18.41 (14.45–23.27) ng/mL vs. 8.74 (7.03–12.35) ng/mL; p < 0.001). The gene discussed is OGN; the disease is type 2 diabetes mellitus.