The analysis of specific antinuclear antibodies concentrations in children with connective tissue diseases

Methods We observed 187 children from 2 to 18 years (median 13 years, 25‰ – 9 years, 75‰ – 15 years); 70 (37,4%) boys, 117 (62,6%) – girls with systemic lupus erythematosis (SLE), juvenile rheumatoid arthritis (JRA), spondyloarthritis (SA), scleroderma (systemic/localized), dermatomyosites and mixed CTD (MCTD). All patients undergo common rheumatologic examination. Specific ANA were measured with Elia method on ImmunoCAP 250 (Phadia). Results Only girls with CTDs had positive specific ANA. There were no significant differences between the ages of children with positive and negative results and with different positive antibodies. Duration of the disease and concentration of antibodies didn’t correlate. Children with positive results had severer forms of CTDs, but there were also 4 patients with active SLE and negative results of measured antibodies. Anti-Ro were detected in the «above» concentrations in 7 cases (all with SLE) and anti-Jo-1 in all positive cases. 7 children with SLE had combination of positive ds-DNA and Sm or dsDNA and anti-Ro. (Table 1)