HLA as an immunogenetic risk factor in juvenile chronic arthritis.

We investigated the frequencies of HLA-A, -B, -C and -DR antigens in diseased and control group with the aim to find immunogenetic factors that influence the pathogenesis and clinical course of juvenile chronic arthritis (JCA). The study was conducted on 73 JCA patients, 24 boys and 49 girls. On the basis of observed HLA antigen frequencies the relative risks (RR) and their statistical significance as well as the attributable risks (delta) were calculated.