BIRC5 and enthesitis-related juvenile idiopathic arthritis: Patients with ERA had a significantly higher level of survivin compared with NRA patients in plasma (430 ± 108 pg/ml versus 127 ± 5 pg/ml, P = 0.0022) and in the synovial fluid (434 ± 181 pg/ml versus 124 ± 2 pg/ml, P = 0.0029).