Aoki C, Inaba Y, Choe H, Kaneko U, Hara R, Miyamae T, Imagawa T, Mori M, Oba MS, Yokota S, Saito T. Discrepancy between clinical and radiological responses to tocilizumab treatment in patients with systemic-onset juvenile idiopathic arthritis. J Rheumatol 2014;41:1171–7. In Materials and Methods, paragraph 1, sentence 5, the definition of high-dose should read: (0.2 mg/kg/day or more of prednisolone). We regret the error.