{"nct_id":"NCT00424788","title":"A Multicenter Study to Assess the Effect of Plasma Exchange in Accelerating the Clearance of Natalizumab in Subjects With Multiple Sclerosis (MS)","status":"COMPLETED","status_verified_date":"2009-09","start_date":"2007-01","start_date_type":null,"primary_completion_date":"2007-10","primary_completion_date_type":"ACTUAL","completion_date":"2007-10","completion_date_type":"ACTUAL","phases":["EARLY_PHASE1"],"tickers":["BIIB"]}