Low mannose binding lectin predicts poor prognosis in patients with early rheumatoid arthritis. A prospective study
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CitationJ. Rheumatol. 2001, 28(4):728-34
AbstractOBJECTIVE: To determine whether low mannose binding lectin (MBL) is associated with poor prognosis in rheumatoid arthritis (RA) and whether patients with RA have increased frequency of MBL deficiency. METHODS: Patients with recent onset symmetric polyarthritis (< 1 year, median 3 mo) were recruited if they had not been treated longer than 2 weeks with disease modifying drugs. They were reevaluated after 6 months and their disease activity and progression were correlated with their MBL concentration, rheumatoid factor (RF) isotypes, and C-reactive protein (CRP). Sixty-three female patients with advanced RA were also analyzed. RESULTS: Sixty-five patients with early arthritis fulfilled American College of Rheumatology criteria for RA and 52 were followed for 6 months or longer. Low MBL was associated with raised RF, IgA RF in particular (p = 0.02). and also with a combined elevation of IgM and IgA RF (p = 0.035). Patients with low MBL (lowest 25th percentile) showed less improvement after 6 months of treatment than patients in the highest MBL quartile. This applied to the Thompson joint score (p = 0.03) and grip strength (p = 0.004). Low MBL was also significantly associated with radiological joint erosions at recruitment and at 6 month followup (p = 0.039); and the group with advanced RA also showed a significant association between low MBL concentration and radiological damage (p = 0.036). However. neither patient group had increased frequency of MBL deficiency compared to healthy controls. CONCLUSION: Low MBL predicts poor prognosis in patients with early RA.
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