Our results also differed from the findings of a study of 47 RA patients [23], which found a significant correlation between serum MCP-1 levels and ESR/CRP levels (the association between MCP-1 and ESR in our study was rho  = 0.197 and P  = 0.038; that between MCP-1 and CRP was rho  = 0.125 and P  = 0.189) and which found no correlation between serum MCP-1 levels and SJC or DAS28 (Table 2). Here, CCL2 is linked to rheumatoid arthritis.