The results showed that the serum ORM2 concentration was positively correlated with simultaneously measured parameters for RA activity, including the CRP level (rho = 0.47) and disease activity score 28 (DAS28, rho = 0.28), while it was negatively correlated with the serum ALB concentration (rho = −0.29) and Hb concentration (rho = −0.32) (Fig. 7d). This evidence concerns the gene GSTM1 and rheumatoid arthritis.