RA vs. HC: p = NSLinear regression with S100A9: β = −0.77, 95% CI: −0.78 to 0.009, p = 0.06Linear regression with S100A8: β = −0.39, 95% CI: −1.37 to −016, p = 0.01Linear regression with S100A12: β = −0.28, 95% CI: −0.61 to 0.05, p = 0.09 This evidence concerns the gene S100A9 and rheumatoid arthritis.