An Open-label, Multi-arm, Non-comparative Safety and Tolerability Study of Canakinumab (ACZ885) in Patients With Active Systemic Juvenile Idiopathic Arthritis (SJIA)

This two-part open-label, multi-arm, non-comparative study will collect long-term safety, efficacy and tolerability data from patients who were responsive to canakinumab from study CACZ885G2301E1 (Cohort 1), and from patients who are treatment naïve to canakinumab (Cohort 2). In addition, the effect of inactivated vaccines in an SJIA patient population will be assessed for the development of adequate (protective) antibody levels following immunization according to respective local vaccination guidelines. Study Part I: All patients will be treated with canakinumab 4 mg/kg every 4 weeks (or 2 mg/kg every 4 weeks for Cohort 1 patients who are receiving that dose in CACZ885G2301E1) until study end unless discontinuation occurs, or until they qualify for Part II of the study. Study Part II: Patients who are eligible will be randomized to receive canakinumab at a reduced dose or prolonged dose interval (see requirements for dose reduction/dose interval prolongation below). Patients in Cohort 1 receiving 2 mg/kg q4wk in CACZ885G2301E1 will not be randomized but will be part of the treatment arm canakinumab dose reduction if they are eligible.