{"nct_id":"NCT01416181","title":"A Clinical Study of the Efficacy of Natalizumab on Reducing Disability Progression in Participants With Secondary Progressive Multiple Sclerosis","status":"TERMINATED","status_verified_date":"2017-08","start_date":"2011-09-13","start_date_type":"ACTUAL","primary_completion_date":"2015-07-28","primary_completion_date_type":"ACTUAL","completion_date":"2016-04-13","completion_date_type":"ACTUAL","phases":["PHASE3"],"tickers":["BIIB"]}