Figure 4.

Relationship between expressions of 78-kDa glucose-regulated protein (GRP78) of synovial plasma cells and corrected synovial fluid level of anti-cyclic citrullinated peptide antibodies (anti-CCP) (IgG) in rheumatoid arthritis. The highly positive associations of the expression of GRP78 of plasma cells detected by flow cytometry and Western blotting with the corrected synovial fluid level of anti-CCP (× 10⁵ RU/g per L) are presented in (a) (Rs = 0.676, P < 0.001) and (b) (Rs = 0.694, P < 0.001), respectively. MFI, mean fluorescent intensity.