{"nct_id":"NCT01071083","title":"Treatment Interruption of Natalizumab","status":"COMPLETED","status_verified_date":"2012-11","start_date":"2010-03","start_date_type":null,"primary_completion_date":"2011-11","primary_completion_date_type":"ACTUAL","completion_date":"2011-11","completion_date_type":"ACTUAL","phases":["PHASE2"],"tickers":["BIIB"]}