Evidence of cartilaginous benefit of treatment with infliximab in rheumatoid arthritis using measurement of serum COMP

Abstract

Recently, it has become possible to measure the concentration of serum cartilage oligomeric matrix protein (COMP) in various arthritis, and it is expected to be a novel biomarker indicative of cartilage destruction. In this study, we evaluated the diagnostic effectiveness of serum COMP in rheumatic diseases and analyzed the inhibition of cartilage destruction in patients with rheumatoid arthritis who were prescribed with infliximab (IFX) for one year. The changes in the concentration of serum COMP and the joint narrow space of Sharp score (⊿Sharp-JNS) were evaluated. The level of serum COMP decreased from 23.04±7.14 U/lto 8.69±2.89U/l (p<0.005) and improved ⊿Sharp-JNS (−0.50+6.38 points). We believed that these results were influenced by the effects of methotrexate (MTX) that was prescribed together with IFX, and we analyzed the group that was administered only MTX therapy as a reference. However, the serum COMP concentration and Sharp-JNS in the MTX group did not decrease. The serological and radiological results revealed that IFX inhibited cartilage destruction, and it is possible that serum COMP is one of the novel biomarkers in RA patients treated with anti-tumor necrosis factor-a antibody therapy. © 2007, The Japan Society for Clinical Immunology. All rights reserved.