{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Retrospective+Study&page=11",
    "query": {
      "intervention": "Retrospective Study",
      "page": 11
    },
    "page_size": 10
  },
  "pagination": {
    "page": 11,
    "page_size": 10,
    "total_count": 1213,
    "total_pages": 122,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Retrospective+Study&page=12&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Retrospective+Study&page=10&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-23T02:40:24.408Z",
  "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": "NCT04697446",
      "title": "External Control, Observational, Retrospective Study Comparing Pralsetinib to Best Available Therapy in Patients With RET-Fusion Positive NSCLC",
      "overall_status": "UNKNOWN",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "RET-fusion Non Small Cell Lung Cancer",
        "Lung Neoplasm",
        "Carcinoma, Non-Small-Cell Lung",
        "Respiratory Tract Neoplasms",
        "Thoracic Neoplasms",
        "Neoplasms by Site",
        "Neoplasms",
        "Lung Diseases",
        "Respiratory Tract Diseases",
        "Carcinoma, Bronchogenic",
        "Bronchial Diseases",
        "Head and Neck Neoplasms",
        "Carcinoma",
        "Neoplasms by Histologic Type",
        "Neoplasms, Germ Cell and Embryonal",
        "Neoplasms, Nerve Tissue",
        "Metastatic Non Small Cell Lung Cancer"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Blueprint Medicines Corporation",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 279,
      "start_date": "2020-12-01",
      "completion_date": "2021-10-31",
      "has_results": false,
      "last_update_posted_date": "2021-08-10",
      "last_synced_at": "2026-10-23T02:40:24.408Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04697446"
    },
    {
      "nct_id": "NCT01977846",
      "title": "A Natural History of the Progression of Stargardt Disease: Retrospective and Prospective Studies",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Stargardt Disease"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Foundation Fighting Blindness",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "6 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "6 Years and older"
      },
      "enrollment_count": 259,
      "start_date": "2013-08",
      "completion_date": "2017-02",
      "has_results": true,
      "last_update_posted_date": "2019-11-01",
      "last_synced_at": "2026-10-23T02:40:24.408Z",
      "location_count": 6,
      "location_summary": "Baltimore, Maryland • Cleveland, Ohio • Philadelphia, Pennsylvania + 2 more",
      "locations": [
        {
          "city": "Baltimore",
          "state": "Maryland"
        },
        {
          "city": "Baltimore",
          "state": "Maryland"
        },
        {
          "city": "Cleveland",
          "state": "Ohio"
        },
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        },
        {
          "city": "Dallas",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01977846"
    },
    {
      "nct_id": "NCT04006184",
      "title": "Retrospective Review of Saphenous Vein Incompetence: Venaseal Versus Endovenous Thermal Ablation",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Varicose Veins",
        "Venous Reflux",
        "Venous Insufficiency"
      ],
      "interventions": [
        {
          "name": "Chart review",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Lake Washington Vascular",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 547,
      "start_date": "2019-06-14",
      "completion_date": "2019-08-30",
      "has_results": false,
      "last_update_posted_date": "2019-10-03",
      "last_synced_at": "2026-10-23T02:40:24.408Z",
      "location_count": 1,
      "location_summary": "Bellevue, Washington",
      "locations": [
        {
          "city": "Bellevue",
          "state": "Washington"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04006184"
    },
    {
      "nct_id": "NCT03596333",
      "title": "Color Doppler Ultrasound to Locate Needle in Labor Epidural",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Labor Pain",
        "Obstetric Pain"
      ],
      "interventions": [
        {
          "name": "Retrospective chart review",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Augusta University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "18 Years and older · Female only"
      },
      "enrollment_count": 35,
      "start_date": "2018-05-28",
      "completion_date": "2018-06-30",
      "has_results": false,
      "last_update_posted_date": "2018-07-23",
      "last_synced_at": "2026-10-23T02:40:24.408Z",
      "location_count": 1,
      "location_summary": "Augusta, Georgia",
      "locations": [
        {
          "city": "Augusta",
          "state": "Georgia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03596333"
    },
    {
      "nct_id": "NCT02226315",
      "title": "Clinical Performance of the MaterniT21 PLUS LDT in Multiple Gestation Pregnancies",
      "overall_status": "TERMINATED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Down Syndrome",
        "Edwards Syndrome",
        "Patau Syndrome",
        "Turner Syndrome"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Sequenom, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "18 Years and older · Female only"
      },
      "enrollment_count": 50,
      "start_date": "2014-08",
      "completion_date": "2015-09",
      "has_results": false,
      "last_update_posted_date": "2015-09-17",
      "last_synced_at": "2026-10-23T02:40:24.408Z",
      "location_count": 1,
      "location_summary": "Denver, Colorado",
      "locations": [
        {
          "city": "Denver",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02226315"
    },
    {
      "nct_id": "NCT04384276",
      "title": "Weigh Easy: Simplifying Home Weight Monitoring for Infants",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Cleft Lip and Palate"
      ],
      "interventions": [
        {
          "name": "The Weigh Easy System",
          "type": "OTHER"
        },
        {
          "name": "Retrospective Control",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Children's Mercy Hospital Kansas City",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": "12 Weeks",
        "sex": "ALL",
        "summary": "Up to 12 Weeks"
      },
      "enrollment_count": 157,
      "start_date": "2020-10-01",
      "completion_date": "2022-09-30",
      "has_results": false,
      "last_update_posted_date": "2023-01-17",
      "last_synced_at": "2026-10-23T02:40:24.408Z",
      "location_count": 1,
      "location_summary": "Kansas City, Missouri",
      "locations": [
        {
          "city": "Kansas City",
          "state": "Missouri"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04384276"
    },
    {
      "nct_id": "NCT06425848",
      "title": "HF2 Registry - Hemodynamic Frontiers in Heart Failure Registry",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Heart Failure"
      ],
      "interventions": [
        {
          "name": "Observational",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "University of Kansas Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "100 Years",
        "sex": "ALL",
        "summary": "18 Years to 100 Years"
      },
      "enrollment_count": 2000,
      "start_date": "2022-10-21",
      "completion_date": "2030-12-31",
      "has_results": false,
      "last_update_posted_date": "2024-05-22",
      "last_synced_at": "2026-10-23T02:40:24.408Z",
      "location_count": 12,
      "location_summary": "La Jolla, California • Bloomington, Indiana • Kansas City, Kansas + 9 more",
      "locations": [
        {
          "city": "La Jolla",
          "state": "California"
        },
        {
          "city": "Bloomington",
          "state": "Indiana"
        },
        {
          "city": "Kansas City",
          "state": "Kansas"
        },
        {
          "city": "Maplewood",
          "state": "Minnesota"
        },
        {
          "city": "Minneapolis",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06425848"
    },
    {
      "nct_id": "NCT00261989",
      "title": "Pulse Oximetry Readings and Hourly Variation in Oximetry Readings With CHD",
      "overall_status": "TERMINATED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Congenital Disorders"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Children's Healthcare of Atlanta",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 1000,
      "start_date": "2005-11",
      "completion_date": "2007-09",
      "has_results": false,
      "last_update_posted_date": "2011-07-06",
      "last_synced_at": "2026-10-23T02:40:24.408Z",
      "location_count": 1,
      "location_summary": "Atlanta, Georgia",
      "locations": [
        {
          "city": "Atlanta",
          "state": "Georgia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00261989"
    },
    {
      "nct_id": "NCT07210125",
      "title": "Implementation and Deliver of Lenacapavir for PrEP in a Community Pharmacy Setting",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "HIV"
      ],
      "interventions": [
        {
          "name": "Lenacapavir long-acting",
          "type": "DRUG"
        },
        {
          "name": "Standard of Care (SOC)",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "Kelley-Ross & Associates, Inc.",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 75,
      "start_date": "2025-09-16",
      "completion_date": "2027-06-30",
      "has_results": false,
      "last_update_posted_date": "2026-04-02",
      "last_synced_at": "2026-10-23T02:40:24.408Z",
      "location_count": 1,
      "location_summary": "Seattle, Washington",
      "locations": [
        {
          "city": "Seattle",
          "state": "Washington"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07210125"
    },
    {
      "nct_id": "NCT00445445",
      "title": "Changes in Breast Density and Breast Cancer Risk in Women With Breast Cancer and in Healthy Women",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Breast Cancer"
      ],
      "interventions": [
        {
          "name": "physiologic testing",
          "type": "OTHER"
        },
        {
          "name": "screening questionnaire administration",
          "type": "OTHER"
        },
        {
          "name": "breast imaging study",
          "type": "PROCEDURE"
        },
        {
          "name": "radiomammography",
          "type": "PROCEDURE"
        },
        {
          "name": "study of high risk factors",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "OTHER",
        "PROCEDURE"
      ],
      "sponsor": "Case Comprehensive Cancer Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "40 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "40 Years and older · Female only"
      },
      "enrollment_count": 2201,
      "start_date": "2007-01-10",
      "completion_date": "2014-07-21",
      "has_results": false,
      "last_update_posted_date": "2020-02-11",
      "last_synced_at": "2026-10-23T02:40:24.408Z",
      "location_count": 8,
      "location_summary": "Cleveland, Ohio • Mayfield Heights, Ohio • Mentor, Ohio + 5 more",
      "locations": [
        {
          "city": "Cleveland",
          "state": "Ohio"
        },
        {
          "city": "Mayfield Heights",
          "state": "Ohio"
        },
        {
          "city": "Mentor",
          "state": "Ohio"
        },
        {
          "city": "Middleburg Heights",
          "state": "Ohio"
        },
        {
          "city": "Orange",
          "state": "Ohio"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00445445"
    }
  ]
}