An Open-label, Ascending, Repeated Dose-finding Study of Sarilumab in Children and Adolescents With Polyarticular-course Juvenile Idiopathic Arthritis (pcJIA)

For 73 participants enrolled in the dose-finding and second portions, the total study duration per participant was up to 166 weeks that consists of a 4- week screening, a 12-week core treatment phase, a 144-week extension phase, and a 6-week post-treatment follow-up. For 29 participants enrolled in the third portion, the total study duration per participant was up to 106 weeks that consists of a 4- week screening, a 12-week core treatment phase, a 84-week extension phase, and a 6-week post-treatment follow-up.