{"nct_id":"NCT00536120","title":"The Effects of Tysabri Treatment on Vaccination Response and Lymphocyte Subsets in Subjects With Relapsing Forms of Multiple Sclerosis","status":"COMPLETED","status_verified_date":"2016-12","start_date":"2008-01","start_date_type":null,"primary_completion_date":"2009-11","primary_completion_date_type":"ACTUAL","completion_date":"2009-12","completion_date_type":"ACTUAL","phases":["PHASE4"],"tickers":["BIIB"]}