According to calcitriol, RA patients had a positive correlation between calcitriol serum levels and CRP (r = 0.28, p < 0.001), Kannel index score (r = 0.22, p <0.01), TG/HDL-C index score (r = 0.17, p = 0.04), and Castelli index score (r = 0.16, p = 0.04), and a negative correlation with calcidiol serum levels (r = −0.30, p < 0.001 (Figure 2). The gene discussed is CRP; the disease is rheumatoid arthritis.