A Multicenter, Randomized, Open-Label, Parallel-Group, Active-Controlled Study to Evaluate the Benefits of Switching Therapy (Glatiramer Acetate or Interferon Beta-1a) to Natalizumab in Subjects With Relapsing Remitting Multiple Sclerosis

This was a multicenter, randomized, open-label, parallel-group, active-controlled study. Prior to randomization, participants were to have been treated with glatiramer acetate or interferon β-1a (44 μg). Participants were to be randomized to receive natalizumab, interferon β-1a 44 μg, or glatiramer acetate.