Phase 3 Efficacy and Safety Study of BG00012 in Pediatric Participants With Relapsing-Remitting Multiple Sclerosis (RRMS)

Key Inclusion Criteria: * Males and females aged from 10 to less than 18 years old at the time of informed consent or assent. * Must have a body weight of ≥30 kg. * Must have a diagnosis of RRMS (consensus definition for pediatric RRMS \[Krupp 2013\]). * Must be ambulatory with a baseline EDSS score between 0 and 5.5, inclusive. * Must have experienced at least 1 of the following 3 conditions: a) at least 1 relapse within the last 12 months prior to Day 1 with a prior brain MRI demonstrating lesions consistent with MS; b) at least 2 relapses within the last 24 months prior to Day 1, with a prior brain MRI demonstrating lesions consistent with MS; c) evidence of Gd-enhancing lesions of the brain on an MRI performed within the 6 weeks prior to Day 1. * Must be neurologically stable, with no evidence of relapse within 50 days prior to Day 1 and no evidence of corticosteroid treatment within 30 days prior to Day 1. * Participants of childbearing potential who are sexually active must be willing to practice effective contraception during the study and be willing and able to continue contraception for at least 30 days after their final dose of study treatment. Key Exclusion Criteria: * Primary progressive, secondary progressive, or progressive relapsing MS (as defined by \[Lublin and Reingold 1996\]). These conditions require the presence of continuous clinical disease worsening over a period of at least 3 months. Participants with these conditions may also have superimposed rel…