{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Retrospective+study&page=19",
    "query": {
      "intervention": "Retrospective study",
      "page": 19
    },
    "page_size": 10
  },
  "pagination": {
    "page": 19,
    "page_size": 10,
    "total_count": 1214,
    "total_pages": 122,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Retrospective+study&page=20&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Retrospective+study&page=18&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-30T22:16:14.142Z",
  "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": "NCT02923596",
      "title": "Retrospective Study of Keloid Disorder",
      "overall_status": "UNKNOWN",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Keloid"
      ],
      "interventions": [
        {
          "name": "History of prior Surgery",
          "type": "PROCEDURE"
        },
        {
          "name": "History of Radiation Therapy",
          "type": "RADIATION"
        }
      ],
      "intervention_types": [
        "PROCEDURE",
        "RADIATION"
      ],
      "sponsor": "Tirgan, Michael H., M.D.",
      "sponsor_class": "INDIV",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 5000,
      "start_date": "2016-09",
      "completion_date": "2023-09",
      "has_results": false,
      "last_update_posted_date": "2016-10-04",
      "last_synced_at": "2026-10-30T22:16:14.142Z",
      "location_count": 2,
      "location_summary": "New York, New York • San Antonio, Texas",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        },
        {
          "city": "San Antonio",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02923596"
    },
    {
      "nct_id": "NCT05307627",
      "title": "The Effects of Low Dose Naltrexone (LDN) on Diseases of Aging",
      "overall_status": "WITHDRAWN",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Aging"
      ],
      "interventions": [
        {
          "name": "low-dose naltrexone",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "AgelessRx",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": null,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "120 Years",
        "sex": "ALL",
        "summary": "18 Years to 120 Years"
      },
      "enrollment_count": 0,
      "start_date": "2022-03-14",
      "completion_date": "2023-12-14",
      "has_results": false,
      "last_update_posted_date": "2024-08-06",
      "last_synced_at": "2026-10-30T22:16:14.142Z",
      "location_count": 1,
      "location_summary": "Ann Arbor, Michigan",
      "locations": [
        {
          "city": "Ann Arbor",
          "state": "Michigan"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05307627"
    },
    {
      "nct_id": "NCT03690596",
      "title": "Smoking Relapse Prevention Via Just-in-Time-Adaptive Interventions",
      "overall_status": "UNKNOWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Smoking Cessation"
      ],
      "interventions": [
        {
          "name": "NRT + QuitBuddy",
          "type": "OTHER"
        },
        {
          "name": "NRT + QuitBuddy-Recall",
          "type": "OTHER"
        },
        {
          "name": "Treatment as Usual",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Meharry Medical College",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 94,
      "start_date": "2019-04-16",
      "completion_date": "2022-01-31",
      "has_results": false,
      "last_update_posted_date": "2021-12-13",
      "last_synced_at": "2026-10-30T22:16:14.142Z",
      "location_count": 1,
      "location_summary": "Nashville, Tennessee",
      "locations": [
        {
          "city": "Nashville",
          "state": "Tennessee"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03690596"
    },
    {
      "nct_id": "NCT05385718",
      "title": "Ezra Faster Scan Study",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Medical Oncology",
        "Cancer",
        "Healthy"
      ],
      "interventions": [
        {
          "name": "Magnetic Resonance Imaging",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Ezra AI, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 694,
      "start_date": "2022-06-01",
      "completion_date": "2025-02-24",
      "has_results": false,
      "last_update_posted_date": "2025-03-03",
      "last_synced_at": "2026-10-30T22:16:14.142Z",
      "location_count": 5,
      "location_summary": "Beverly Hills, California • Chino Hills, California • Irvine, California + 2 more",
      "locations": [
        {
          "city": "Beverly Hills",
          "state": "California"
        },
        {
          "city": "Chino Hills",
          "state": "California"
        },
        {
          "city": "Irvine",
          "state": "California"
        },
        {
          "city": "Los Gatos",
          "state": "California"
        },
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05385718"
    },
    {
      "nct_id": "NCT04654975",
      "title": "Metachronic Brain Metastases After Esophagectomy for Esophageal Cancer (METABREC)",
      "overall_status": "UNKNOWN",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Esophageal Neoplasms",
        "Esophagectomy",
        "Brain Metastases"
      ],
      "interventions": [
        {
          "name": "Esophagectomy for esophageal cancer",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "PROCEDURE"
      ],
      "sponsor": "Universitaire Ziekenhuizen KU Leuven",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 10000,
      "start_date": "2020-06-02",
      "completion_date": "2025-03-31",
      "has_results": false,
      "last_update_posted_date": "2024-07-03",
      "last_synced_at": "2026-10-30T22:16:14.142Z",
      "location_count": 1,
      "location_summary": "Houston, Texas",
      "locations": [
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04654975"
    },
    {
      "nct_id": "NCT02546622",
      "title": "ATHN 2: Factor Switching Study",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Hemophilia"
      ],
      "interventions": [
        {
          "name": "Factor VIII Replacement Products for Hemophilia which were FDA approved after January 1, 2013",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Factor IX Replacement Products for Hemophilia which were FDA approved after January 1, 2013",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "American Thrombosis and Hemostasis Network",
      "sponsor_class": "NETWORK",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 310,
      "start_date": "2015-09",
      "completion_date": "2020-06-30",
      "has_results": false,
      "last_update_posted_date": "2021-12-09",
      "last_synced_at": "2026-10-30T22:16:14.142Z",
      "location_count": 27,
      "location_summary": "San Diego, California • Aurora, Colorado • New Haven, Connecticut + 23 more",
      "locations": [
        {
          "city": "San Diego",
          "state": "California"
        },
        {
          "city": "Aurora",
          "state": "Colorado"
        },
        {
          "city": "New Haven",
          "state": "Connecticut"
        },
        {
          "city": "Washington D.C.",
          "state": "District of Columbia"
        },
        {
          "city": "St. Petersburg",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02546622"
    },
    {
      "nct_id": "NCT00584272",
      "title": "Retrospective Study on the Outcome of Cleft Palate Repair: Comparing US Surgical and Ethicon Suture Materials",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Cleft Palate"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "University of California, Davis",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "1 Year",
        "maximum_age": "10 Years",
        "sex": "ALL",
        "summary": "1 Year to 10 Years"
      },
      "enrollment_count": 88,
      "start_date": "2007-03",
      "completion_date": "2015-04",
      "has_results": false,
      "last_update_posted_date": "2017-06-20",
      "last_synced_at": "2026-10-30T22:16:14.142Z",
      "location_count": 1,
      "location_summary": "Sacramento, California",
      "locations": [
        {
          "city": "Sacramento",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00584272"
    },
    {
      "nct_id": "NCT04994795",
      "title": "Predictive Multimodal Signatures Associated With Response to Treatment and Prognosis of Patients With Stage IV Non-small Cell Lung Cancer",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Non-small Cell Lung Cancer Metastatic"
      ],
      "interventions": [
        {
          "name": "Predictive models (data collection)",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Sophia Genetics SAS",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 4000,
      "start_date": "2021-08-21",
      "completion_date": "2025-02",
      "has_results": false,
      "last_update_posted_date": "2024-11-21",
      "last_synced_at": "2026-10-30T22:16:14.142Z",
      "location_count": 6,
      "location_summary": "Iowa City, Iowa • Worcester, Massachusetts • Rochester, Minnesota + 3 more",
      "locations": [
        {
          "city": "Iowa City",
          "state": "Iowa"
        },
        {
          "city": "Worcester",
          "state": "Massachusetts"
        },
        {
          "city": "Rochester",
          "state": "Minnesota"
        },
        {
          "city": "Buffalo",
          "state": "New York"
        },
        {
          "city": "Salt Lake City",
          "state": "Utah"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04994795"
    },
    {
      "nct_id": "NCT00366821",
      "title": "Retrospective Review of the Outcomes of Newborns With Genetic Abnormalities",
      "overall_status": "COMPLETED",
      "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": "30 Days",
        "sex": "ALL",
        "summary": "Up to 30 Days"
      },
      "enrollment_count": 1000,
      "start_date": "2002-01",
      "completion_date": "2014-11",
      "has_results": false,
      "last_update_posted_date": "2014-12-02",
      "last_synced_at": "2026-10-30T22:16:14.142Z",
      "location_count": 1,
      "location_summary": "Atlanta, Georgia",
      "locations": [
        {
          "city": "Atlanta",
          "state": "Georgia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00366821"
    },
    {
      "nct_id": "NCT02308904",
      "title": "Reproductive Capacity and Iron Burden in Thalassemia",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "THALASSEMIA MAJOR"
      ],
      "interventions": [
        {
          "name": "Blood Draw/Semen Exam",
          "type": "OTHER"
        },
        {
          "name": "Retrospective data/Chart Review/Relevant Clinical Results",
          "type": "OTHER"
        },
        {
          "name": "Pituitary MRI",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "UCSF Benioff Children's Hospital Oakland",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "12 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "12 Years and older"
      },
      "enrollment_count": 59,
      "start_date": "2013-06-01",
      "completion_date": "2020-09-01",
      "has_results": false,
      "last_update_posted_date": "2020-12-23",
      "last_synced_at": "2026-10-30T22:16:14.142Z",
      "location_count": 1,
      "location_summary": "Oakland, California",
      "locations": [
        {
          "city": "Oakland",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02308904"
    }
  ]
}