The study of Chen et al. [7] indicated that IL-6 rs1800795, rs1800796 and rs1800797 might play important roles in diabetic nephropathy development while IL-6 rs2069837 and rs2069840 might not be related to diabetic nephropathy, but it is a pity that the data analyzed in the present study included both T1DM and T2DM, and the results of T2DM were not analyzed separately. Here, IL6 is linked to diabetic kidney disease.