Table 1.

Characteristics of RA patients who donated synovial specimens for this study

Patient characteristics
Gender (female/male)	9 (9/0)
Age, mean (range), years	70.6 (55–83)
Disease duration, mean (range), years	11.2 (7–20)
CRP, mean (range), mg/dl	0.60 (0.07–2.3)
ESR, mean (range), mm/h	36.8 (6–88)
MMP-3, mean (range), ng/ml	260.9 (40.5–660.4)
Seropositive/seronegative/unknown, N	5/3/1
ACPA positive/negative, N	4/2
Steinbrocker stage, II/III/IV, N	1/5/3
Patients using DMARDs
Methotrexate, N	8
Bucillamine, N	2
TNF inhibitors, N	5
Patients using oral steroids, N	6

RA, rheumatoid arthritis; CRP, C-reactive protein; ESR, erythrocyte sedimentation rate; MMP, matrix metalloproteinase; ACPA, anti-cyclic citrullinated peptide antibody; DMARDs, disease-modifying antirheumatic drugs; TNF, tumor necrosis factor; N, number