{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Placebo+matched+to+VX-661",
    "query": {
      "intervention": "Placebo matched to VX-661"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 22,
    "total_pages": 3,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Placebo+matched+to+VX-661&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-30T05:28:58.746Z",
  "attribution": "Data derived from public ClinicalTrials.gov records. The official record at https://clinicaltrials.gov/ remains the source of truth for current availability, contacts, and full study details.",
  "notes": [
    "This endpoint exposes only public summary fields — no participant contact emails, phone numbers, or scraped investigator contact details.",
    "For contact information and full protocol detail, follow each trial's `official_url` to the ClinicalTrials.gov record.",
    "This API is a navigational aid. It does not provide medical advice, eligibility determinations, or compensation guarantees."
  ],
  "trials": [
    {
      "nct_id": "NCT02516410",
      "title": "A Study to Evaluate the Efficacy and Safety of VX-661 in Combination With Ivacaftor in Subjects Aged 12 Years and Older With Cystic Fibrosis, Heterozygous for the F508del-CFTR Mutation",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Cystic Fibrosis"
      ],
      "interventions": [
        {
          "name": "VX-661 plus ivacaftor combination",
          "type": "DRUG"
        },
        {
          "name": "Ivacaftor",
          "type": "DRUG"
        },
        {
          "name": "Placebo (matched to VX-661 plus ivacaftor combination)",
          "type": "DRUG"
        },
        {
          "name": "Placebo (matched to ivacaftor)",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Vertex Pharmaceuticals Incorporated",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "12 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "12 Years and older"
      },
      "enrollment_count": 168,
      "start_date": "2015-08",
      "completion_date": "2016-06-07",
      "has_results": true,
      "last_update_posted_date": "2018-06-12",
      "last_synced_at": "2026-09-30T05:28:58.746Z",
      "location_count": 22,
      "location_summary": "Birmingham, Alabama • La Jolla, California • Los Angeles, California + 19 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "La Jolla",
          "state": "California"
        },
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Denver",
          "state": "Colorado"
        },
        {
          "city": "Miami",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02516410"
    },
    {
      "nct_id": "NCT03460990",
      "title": "A Study of VX-659 Combination Therapy in CF Subjects Homozygous for F508del (F/F)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Cystic Fibrosis"
      ],
      "interventions": [
        {
          "name": "VX-659/TEZ/IVA",
          "type": "DRUG"
        },
        {
          "name": "TEZ/IVA",
          "type": "DRUG"
        },
        {
          "name": "IVA",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Vertex Pharmaceuticals Incorporated",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "12 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "12 Years and older"
      },
      "enrollment_count": 116,
      "start_date": "2018-05-01",
      "completion_date": "2018-10-08",
      "has_results": true,
      "last_update_posted_date": "2019-10-17",
      "last_synced_at": "2026-09-30T05:28:58.746Z",
      "location_count": 28,
      "location_summary": "Birmingham, Alabama • New Haven, Connecticut • Miami, Florida + 25 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "New Haven",
          "state": "Connecticut"
        },
        {
          "city": "Miami",
          "state": "Florida"
        },
        {
          "city": "Boise",
          "state": "Idaho"
        },
        {
          "city": "Niles",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03460990"
    },
    {
      "nct_id": "NCT07437105",
      "title": "Dose Escalation Study Evaluating the Safety and Pharmacokinetics of VX-272 in Healthy Participants",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Cystic Fibrosis"
      ],
      "interventions": [
        {
          "name": "VX-272",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        },
        {
          "name": "Tezacaftor",
          "type": "DRUG"
        },
        {
          "name": "Deutivacaftor",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Vertex Pharmaceuticals Incorporated",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "55 Years",
        "sex": "ALL",
        "summary": "18 Years to 55 Years"
      },
      "enrollment_count": 160,
      "start_date": "2026-02-25",
      "completion_date": "2027-06-26",
      "has_results": false,
      "last_update_posted_date": "2026-09-23",
      "last_synced_at": "2026-09-30T05:28:58.746Z",
      "location_count": 1,
      "location_summary": "Tempe, Arizona",
      "locations": [
        {
          "city": "Tempe",
          "state": "Arizona"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07437105"
    },
    {
      "nct_id": "NCT07283770",
      "title": "Dose Escalation Study Evaluating the Safety and Pharmacokinetics of VX-581 in Healthy Participants",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Cystic Fibrosis"
      ],
      "interventions": [
        {
          "name": "VX-581",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        },
        {
          "name": "D-IVA",
          "type": "DRUG"
        },
        {
          "name": "TEZ",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Vertex Pharmaceuticals Incorporated",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "55 Years",
        "sex": "ALL",
        "summary": "18 Years to 55 Years"
      },
      "enrollment_count": 136,
      "start_date": "2025-12-09",
      "completion_date": "2026-11-19",
      "has_results": false,
      "last_update_posted_date": "2026-09-21",
      "last_synced_at": "2026-09-30T05:28:58.746Z",
      "location_count": 1,
      "location_summary": "Overland Park, Kansas",
      "locations": [
        {
          "city": "Overland Park",
          "state": "Kansas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07283770"
    },
    {
      "nct_id": "NCT03525548",
      "title": "A Study of VX-445 Combination Therapy in CF Subjects Homozygous for F508del (F/F)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Cystic Fibrosis"
      ],
      "interventions": [
        {
          "name": "VX-445/TEZ/IVA",
          "type": "DRUG"
        },
        {
          "name": "TEZ/IVA",
          "type": "DRUG"
        },
        {
          "name": "IVA",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Vertex Pharmaceuticals Incorporated",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "12 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "12 Years and older"
      },
      "enrollment_count": 113,
      "start_date": "2018-08-03",
      "completion_date": "2018-12-28",
      "has_results": true,
      "last_update_posted_date": "2020-01-27",
      "last_synced_at": "2026-09-30T05:28:58.746Z",
      "location_count": 28,
      "location_summary": "Tucson, Arizona • Little Rock, Arkansas • Long Beach, California + 24 more",
      "locations": [
        {
          "city": "Tucson",
          "state": "Arizona"
        },
        {
          "city": "Little Rock",
          "state": "Arkansas"
        },
        {
          "city": "Long Beach",
          "state": "California"
        },
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Madera",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03525548"
    },
    {
      "nct_id": "NCT06154447",
      "title": "Evaluation of VX-828 in Healthy Participants and in Participants With Cystic Fibrosis",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Cystic Fibrosis"
      ],
      "interventions": [
        {
          "name": "VX-828",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        },
        {
          "name": "Itraconazole",
          "type": "DRUG"
        },
        {
          "name": "Midazolam",
          "type": "DRUG"
        },
        {
          "name": "Tezacaftor",
          "type": "DRUG"
        },
        {
          "name": "VX-118",
          "type": "DRUG"
        },
        {
          "name": "Deutivacaftor",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Vertex Pharmaceuticals Incorporated",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 165,
      "start_date": "2023-12-12",
      "completion_date": "2026-07-10",
      "has_results": false,
      "last_update_posted_date": "2026-08-10",
      "last_synced_at": "2026-09-30T05:28:58.746Z",
      "location_count": 12,
      "location_summary": "Hollywood, Florida • Orlando, Florida • Overland Park, Kansas + 9 more",
      "locations": [
        {
          "city": "Hollywood",
          "state": "Florida"
        },
        {
          "city": "Orlando",
          "state": "Florida"
        },
        {
          "city": "Overland Park",
          "state": "Kansas"
        },
        {
          "city": "Lexington",
          "state": "Kentucky"
        },
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06154447"
    },
    {
      "nct_id": "NCT02951195",
      "title": "A Study Evaluating the Safety of VX-152 Combination Therapy in Adults With Cystic Fibrosis",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Cystic Fibrosis"
      ],
      "interventions": [
        {
          "name": "VX-152",
          "type": "DRUG"
        },
        {
          "name": "TEZ/IVA",
          "type": "DRUG"
        },
        {
          "name": "IVA",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Vertex Pharmaceuticals Incorporated",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 80,
      "start_date": "2016-11",
      "completion_date": "2018-01",
      "has_results": true,
      "last_update_posted_date": "2021-01-28",
      "last_synced_at": "2026-09-30T05:28:58.746Z",
      "location_count": 16,
      "location_summary": "Birmingham, Alabama • La Jolla, California • Los Angeles, California + 13 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "La Jolla",
          "state": "California"
        },
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Orlando",
          "state": "Florida"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02951195"
    },
    {
      "nct_id": "NCT03227471",
      "title": "A Study of VX-445 in Healthy Subjects and Subjects With Cystic Fibrosis",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1",
        "PHASE2"
      ],
      "conditions": [
        "Cystic Fibrosis"
      ],
      "interventions": [
        {
          "name": "IVA",
          "type": "DRUG"
        },
        {
          "name": "TEZ/IVA",
          "type": "DRUG"
        },
        {
          "name": "VX-445",
          "type": "DRUG"
        },
        {
          "name": "Matched Placebo",
          "type": "DRUG"
        },
        {
          "name": "TEZ",
          "type": "DRUG"
        },
        {
          "name": "VX-561",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Vertex Pharmaceuticals Incorporated",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 225,
      "start_date": "2017-01-23",
      "completion_date": "2018-03-27",
      "has_results": true,
      "last_update_posted_date": "2022-01-18",
      "last_synced_at": "2026-09-30T05:28:58.746Z",
      "location_count": 26,
      "location_summary": "Tucson, Arizona • Little Rock, Arkansas • Madera, California + 23 more",
      "locations": [
        {
          "city": "Tucson",
          "state": "Arizona"
        },
        {
          "city": "Little Rock",
          "state": "Arkansas"
        },
        {
          "city": "Madera",
          "state": "California"
        },
        {
          "city": "Oakland",
          "state": "California"
        },
        {
          "city": "Denver",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03227471"
    },
    {
      "nct_id": "NCT03912233",
      "title": "A Study to Evaluate the Safety and Efficacy of VX-121 Combination Therapy in Subjects With Cystic Fibrosis",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Cystic Fibrosis"
      ],
      "interventions": [
        {
          "name": "VX-121",
          "type": "DRUG"
        },
        {
          "name": "TEZ",
          "type": "DRUG"
        },
        {
          "name": "VX-561",
          "type": "DRUG"
        },
        {
          "name": "TEZ/IVA",
          "type": "DRUG"
        },
        {
          "name": "IVA",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Vertex Pharmaceuticals Incorporated",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 87,
      "start_date": "2019-04-30",
      "completion_date": "2019-12-10",
      "has_results": true,
      "last_update_posted_date": "2023-04-20",
      "last_synced_at": "2026-09-30T05:28:58.746Z",
      "location_count": 12,
      "location_summary": "Los Angeles, California • Oakland, California • Lexington, Kentucky + 9 more",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Oakland",
          "state": "California"
        },
        {
          "city": "Lexington",
          "state": "Kentucky"
        },
        {
          "city": "New Orleans",
          "state": "Louisiana"
        },
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03912233"
    },
    {
      "nct_id": "NCT03447249",
      "title": "A Phase 3 Study of VX-659 Combination Therapy in Subjects With Cystic Fibrosis Heterozygous for the F508del Mutation and a Minimal Function Mutation (F/MF)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Cystic Fibrosis"
      ],
      "interventions": [
        {
          "name": "VX-659/TEZ/IVA",
          "type": "DRUG"
        },
        {
          "name": "IVA",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Vertex Pharmaceuticals Incorporated",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "12 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "12 Years and older"
      },
      "enrollment_count": 385,
      "start_date": "2018-03-07",
      "completion_date": "2019-02-05",
      "has_results": true,
      "last_update_posted_date": "2020-03-13",
      "last_synced_at": "2026-09-30T05:28:58.746Z",
      "location_count": 48,
      "location_summary": "Birmingham, Alabama • Palo Alto, California • Aurora, Colorado + 44 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Palo Alto",
          "state": "California"
        },
        {
          "city": "Aurora",
          "state": "Colorado"
        },
        {
          "city": "Hartford",
          "state": "Connecticut"
        },
        {
          "city": "New Haven",
          "state": "Connecticut"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03447249"
    }
  ]
}