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  • Title: Evaluation of rheumatoid factor and anti-citrullinated peptide antibodies in relation to rheumatological manifestations in patients with leprosy from Southern Brazil.
    Author: Dionello CF, Rosa Utiyama SR, Radominski SC, Stahlke E, Stinghen ST, de Messias-Reason IJ.
    Journal: Int J Rheum Dis; 2016 Oct; 19(10):1024-1031. PubMed ID: 26250118.
    Abstract:
    BACKGROUND: Leprosy patients may present several osteoarticular complaints, which require further evaluation of inflammatory diseases, such as rheumatoid arthritis (RA). Therefore, an adequate clinical assessment in addition to testing for rheumatoid factors (RF) and anticyclic citrullinated peptide antibodies (anti-CCP), can be useful in order to establish the correct diagnosis. METHOD: In this study, the relation of RF and anti-CCP with rheumatological manifestations was evaluated in 97 leprosy patients from Southern Brazil. The results were compared to RA patients and healthy controls from the same geographical area and ethnic background. RESULTS: Neuropathy was observed in 71.1% and arthritis in 35.1% of the leprosy patients. A high frequency of RF positivity was observed among the leprosy patients (41.2%, 40/97), with RF immunoglobulin A (IgA) significantly associated with arthritis (OR = 7.9, 95% CI = 1.5-40.6 P = 0.008). Anti-CCP was observed in 9.3% (9/97) of the patients, with anti-CCP2 being the most frequent subtype. Only 4.1% (4/97) of the patients were RF and anti-CCP concomitantly positive. RF IgM showed a significant association with leprosy when compared to healthy controls (P < 0.0001) whereas for anti-CCP2 no significant results were observed (P = 0.0585). However, both biomarkers showed a strong association with RA when compared to leprosy in patients from the same geographical area and ethnic background (anti-CCP2 OR = 38.6; 95% CI = 16.49-90.26; P < 0.0001 and RF IgM OR = 4.51; 95% CI = 2.62-7.77; P < 0.0001). CONCLUSION: Due to the similarity of some rheumatological manifestations in leprosy with other inflammatory diseases, such as RA, clinical and laboratorial evaluation of affected patients must be carefully assessed in order to achieve proper diagnosis and treatment.
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