Between 13 patients with other rheumatic diseases enrolled, 2 patients with polyarticular juvenile idiopathic arthritis (JIA) antinuclear antibodies (ANA) positive, 5 patients with oligoarticular JIA (3 of whom with ANA positive and 2 with ANA negative), 1 with chronic non-bacterial osteomyelitis, 3 with undefined autoinflammatory diseases, 1 with undefined orbital granulomatous lesions and 1 with Kikuchi-Fujimoto disease. Here, BTG3 is linked to oligoarticular juvenile idiopathic arthritis.