In the comparison of PJI and non-PJI group, the mean number of serum CRP was 61.84 ± 43.04 mg/L (interquartile range [IQR], 15.50–105.25 mg/L) and 7.39 ± 9.10 mg/L (IQR,5.00–5.00 mg/L) (p < 0.05), respectively, while serum SOD was 135.95 ± 24.47 U/ml (IQR, 111.85–158.30 U/ml) and 173.83 ± 13.9 U/ml (IQR,162.83–183.5 U/ml) (p < 0.05), respectively. The gene discussed is SOD1; the disease is juvenile polyposis syndrome.