In the case of CRP concentration, higher concentrations of this protein were found in patients with diabetic nephropathy and the G/G genotype compared to the control group with the same genotype (p = 0.011), and its higher concentrations were also observed in patients after kidney transplantation with the G/T genotype compared to the control group with the same genotype (p = 0.008). This evidence concerns the gene CRP and diabetic kidney disease.