We tested the association between DHCR7, CYP2R1 and GC genotypes and clinical characteristics of study participants including gender, age, weight, BMI, waist, HbA1c, T2D duration, blood pressure, total cholesterol, HDL and LDL-cholesterol, and circulating triglycerides. This evidence concerns the gene CYP2R1 and type 2 diabetes mellitus.