PSIP1 and juvenile idiopathic arthritis: In the cohorts with an established autoimmune diagnosis, anti-DFS70 antibodies were found in children with a variety of diseases—for example, in patients with JIA (19/85, 22.4%), in those with cSLE (4/17, 23.5%), in those with JDM (1/2, 50%) and in others (Table 1).