The clinical characteristics for RA patients who provided their SF were as follows; 3 males and 15 females, age 57.1 ± 3.9 years, ESR 50.2 ± 8.6 mm/h, CRP 3.3 ± 0.7 mg/dl, and rheumatoid factor 65 ± 20.0 IU/ml. Here, CRP is linked to rheumatoid arthritis.