Fig. 1

CFH is elevated in the serum and synovial fluid from RA. A CFH in serum from RA patients and healthy control detected by ELISA. (RA: n = 52; HC: n = 28). B CFH in synovial fluid from RA and OA patients detected by ELISA. (RA: n = 8; OA: n = 4). C Correlation analysis of CFH expression in serum of RA patients with ESR, DAS28, and hs-CRP respectively. Data are expressed as mean ± SEM. ***p < 0.001; RA: rheumatoid arthritis; OA: osteoarthritis; HC: healthy control; hs-CRP: high sensitivity C-reactive protein; ESR: erythrocyte sedimentation rate; DAS28: disease activity score 28