{"nct_id":"NCT00871780","title":"A Prospective, Open-label, Non-randomized, Clinical Trial to Determine if Natalizumab (Tysabri®) Improves Ambulatory Measures in Relapsing-remitting Multiple Sclerosis (RRMS) Patients","status":"COMPLETED","status_verified_date":"2017-02","start_date":"2009-08","start_date_type":null,"primary_completion_date":"2012-07","primary_completion_date_type":"ACTUAL","completion_date":"2012-07","completion_date_type":"ACTUAL","phases":["PHASE4"],"tickers":["BIIB"]}