In addition, u-Cys was lower in NA-DKD versus A-DKD patients (12.06 [8.09–19.51] ng/mL vs. 22.11 [11.13–27.93] ng/mL, P = 0.01) and AL-DKD patients (12.06 [8.09–19.51] ng/mL vs. 18.20 [11.85–42.93], P = 0.01) and u-B2M was higher in AL-DKD patients vs. controls (52.90 [9.06–369.19] ng/mL vs. 13.83 [4.18–33.41] ng/mL, P = 0.001) and A-DKD patients versus controls (33.53 [7.71–66.33] ng/mL vs. 13.83 [4.18–33.41] ng/mL, P = 0.048). The gene discussed is B2M; the disease is axial length measurement.