Study of MRA for Systemic Juvenile Idiopathic Arthritis (sJIA)

Inclusion criteria * Patients diagnosed as having systemic JIA based on the International League of Associations for Rheumatology criteria (1997) * Patients between 2 and 19 years of age * Patients who are under 16 years of age at onset * Patients who have been treated with corticosteroids (continued treatment for 3 months or longer at a dose of ≥0.2 mg/kg as prednisolone equivalent) but who failed to respond adequately or in whom treatment could not be continued or the dose could not be increased due to adverse drug reactions Exclusion criteria * Patients who have been treated with infliximab or etanercept within 12 weeks before treatment with the investigational product * Patients who have received the following treatments within 4 weeks before treatment with the investigational product 1. Surgical treatment (e.g., operation) 2. Plasma exchange therapy"