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?:abstract
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OBJECTIVES: Etanercept, a tumor necrosis factor inhibitor, is an effective drug for patients with active rheumatoid arthritis (RA). Monocyte chemoattractant protein-1 (MCP-1) and nitrotyrosine (NT) are pro-inflammatory biomolecules associated with satiety and increased body weight. We evaluated whether MCP-1 and NT are associated with decreased inflammation or increased body mass during etanercept therapy in active RA patients. METHODS: RA patients with moderate to high disease activity were enrolled to receive add-on etanercept (25 mg subcutaneous injection, biweekly) for at least one year, combined with sustained treatment with conventional synthetic disease-modifying anti-rheumatic drugs (csDMARDs). RESULTS: Forty patients received add-on etanercept and 15 received DMARDs alone. At the end of one year, etanercept significantly reduced the disease activity score of 28 joints, C-reactive protein, and erythrocyte sedimentation rate. Moreover, etanercept significantly increased the body weight, body mass index (BMI), as well as MCP-1 and NT levels, compared to that in the csDMARD-only group. CONCLUSIONS: Increased serum MCP-1 and NT levels in RA patients with moderate to high disease activity, who underwent one-year etanercept treatment, might be attributed to increase in body weight and BMI rather than induction of more severe autoimmune inflammation.
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