When evaluating the relationship between the autoantibody profile and the number of joints damaged in JIA patients, a correlation was noted with IgA RF (r=0.38, p=0.001), IgM RF (r=0.43, p<0.001), anti-citrullinated fibrinogen antibodies (r=0.33, p=0.006), and IgA and IgG anti-CCP antibodies (r=0.26 and r=0.27, respectively, p<0.028). The gene discussed is CD79A; the disease is juvenile idiopathic arthritis.