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Anti-CCP and antikeratin antibodies in rheumatoid arthritis, primary Sjögren’s syndrome, and Wegener’s granulomatosis

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Abstract

The objective of this study was to investigate the frequency of antibodies against cyclic citrullinated peptides (anti-CCP) and keratin (AKA) in patients with rheumatoid arthritis (RA) as well as in patients with primary Sjögren’s syndrome (pSS) and Wegener’s granulomatosis (WG), who may present with rheumatoid factor (RF)-positive arthritis. The study group consisted of 46 patients with RA (26 patients were negative for RF), 32 with pSS, 22 with WG, and 40 healthy controls. The RF, anti-CCP, and AKA were detected in serum using the latex agglutination test, enzyme-linked immunosorbent assay, and indirect immunofluorescence, respectively. The agreement between those tests was evaluated by kappa test. No positive result for AKA was detected in pSS and WG patients, and anti-CCP was found in only one patient with pSS. The results of kappa tests were low, varying between 0.25 (RF-anti-CCP) and 0.02 (RF-AKA). The sensitivity and specificity values were 43 and 44% for RF, 65 and 98% for anti-CCP, and 58 and 100% for AKA, respectively, in RA patients. In the RF-negative RA group, AKA was found to have a high frequency (55%) in comparison to anti-CCP (38%). Seropositivity was found to be 87% for any one of the three autoantibodies tested in RA patients. With a higher specificity, values for RA, anti-CCP, and AKA seem to be helpful for the differential diagnosis of patients with RF-positive arthritis, which may include patients with WG and pSS, and screening of all three antibodies may increase the diagnostic performance.

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Authors and Affiliations

  1. Division of Rheumatology, Department of Internal Medicine, Istanbul Medical Faculty, Istanbul University, Capa, Istanbul, 34390, Turkey

    Sevil Kamali, Esen Kasapoglu, Ahmet Gul, Lale Ocal, Orhan Aral, Meral Konice & Murat Inanc

  2. Department of Virology and Basic Immunology, Istanbul Medical Faculty, Istanbul University, Capa, Istanbul, 34390, Turkey

    Nuray Gurel Polat & Selim Badur

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  1. Sevil Kamali
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  2. Nuray Gurel Polat
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  3. Esen Kasapoglu
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  4. Ahmet Gul
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  5. Lale Ocal
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  6. Orhan Aral
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  7. Meral Konice
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  8. Selim Badur
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  9. Murat Inanc
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Correspondence to Sevil Kamali.

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Kamali, S., Polat, N.G., Kasapoglu, E. et al. Anti-CCP and antikeratin antibodies in rheumatoid arthritis, primary Sjögren’s syndrome, and Wegener’s granulomatosis. Clin Rheumatol 24, 673–676 (2005). https://doi.org/10.1007/s10067-005-1104-y

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  • DOI: https://doi.org/10.1007/s10067-005-1104-y

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