{"nct_id":"NCT04208529","title":"A Long-term Follow-up Study in Participants Who Received CTX001","status":"ENROLLING_BY_INVITATION","status_verified_date":"2025-08","start_date":"2021-01-20","start_date_type":"ACTUAL","primary_completion_date":"2039-09-30","primary_completion_date_type":"ESTIMATED","completion_date":"2039-09-30","completion_date_type":"ESTIMATED","phases":["PHASE3"],"tickers":["VRTX"]}