Anticyclic citrullinated peptide antibodies in juvenile idiopathic arthritis

Anticyclic citrullinated peptide (anti-CCP) antibodies have been detected in patients with juvenile idiopathic arthritis (JRA), particularly in those with polyarticular JIA. We analyzed the presence of anti-CCP antibodies of the IgG class in sera of patients with defined juvenile idiopathic arthritis (JIA) of various subgroups. One hundred and fifty-nine serum samples were investigated. Forty-five patients were diagnosed with JIA (15 male and 30 female) aged 1.9-17.3 years (median 12.9, mean 11.0). Thirty-eight samples were taken from patients suffering from other autoimmunopathies and 34 patients with other underlying diseases were taken at different time points in their disease course. Under 42 samples were taken from patients with noninflammatory diseases. Enzyme-linked immunosorbent assay (ELISA) was used for the detection of anti-CCP antibodies. Anti-CCP antibodies were found in 6.9% of all samples and in 4.4% patients with JIA. Disease duration and medication did not differ significantly between anti-CCP positive and negative patients. A review of the literature and our own results shows that anti-CCP antibodies can be detected in the sera of only some patients with JIA. Routine determination of anti-CCP cannot be recommended.