A Study to Evaluate the Safety, Tolerability, and Efficacy of BIIB017 (Peginterferon Beta-1a) in Pediatric Participants for the Treatment of Relapsing-Remitting Multiple Sclerosis

Prior treatment

• Occurrence of an MS relapse that has occurred within 30 days prior to randomization (Day 1) and/or the participant has not stabilized from a previous relapse prior to randomization (Day 1).
• Any previous treatment with PEGylated human IFN β-1a.
  • Part 2:

Other illness

• Primary progressive, secondary progressive, or progressive relapsing MS. 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 relapses but are distinguished from relapsing participants by the lack of clinically stable periods or clinical improvement.
• History of severe allergic or anaphylactic reactions or known drug hypersensitivity.
• Known allergy to any component of Avonex or BIIB017 formulation.

Lab values

• Any significant changes in medical history occurring after enrollment in Part 1, including laboratory test abnormalities or current clinically significant conditions that, in the opinion of the Investigator, would have excluded the participant's participation in Part 1. The Investigator must re-assess the participant's medical fitness for participation and consider any factors that would preclude treatment.

Other

• Part 1:
• The participant could not tolerate BIIB017 in Part 1.
  • NOTE: Other protocol defined Inclusion/Exclusion criteria may apply.

• Part 1:
• Must have a diagnosis of RRMS as defined by the revised consensus definition for pediatric MS.
• Must have an EDSS score between 0.0 and 5.5.
• Must have experienced \>= 1 relapse in the 12 months prior to randomization (Day 1) or \>= 2 relapses in the 24 months prior to randomization (Day 1) or have evidence of asymptomatic disease activity (Gd-enhancing lesions) on brain MRI in the 6 months prior to randomization (Day 1).
  • Part 2:
• Participants who completed the study treatment in Part 1 (Week 96 Visit), as per protocol.