{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Retrospective+study",
    "query": {
      "intervention": "Retrospective study"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 1200,
    "total_pages": 120,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Retrospective+study&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-09T05:56:13.610Z",
  "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": "NCT04008940",
      "title": "Locking Plates for Distal Femur Fractures - a Multicenter Case Review",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Distal Femur Fracture"
      ],
      "interventions": [
        {
          "name": "Distal femur plates",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "AO Innovation Translation Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 100,
      "start_date": "2012-01",
      "completion_date": "2025-04-24",
      "has_results": false,
      "last_update_posted_date": "2025-09-16",
      "last_synced_at": "2026-09-09T05:56:13.610Z",
      "location_count": 3,
      "location_summary": "Sacramento, California • Houston, Texas • Fairfax, Virginia",
      "locations": [
        {
          "city": "Sacramento",
          "state": "California"
        },
        {
          "city": "Houston",
          "state": "Texas"
        },
        {
          "city": "Fairfax",
          "state": "Virginia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04008940"
    },
    {
      "nct_id": "NCT00553397",
      "title": "Live Lung Donor Retrospective Study",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Lung Transplantation"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "National Institute of Allergy and Infectious Diseases (NIAID)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 369,
      "start_date": "2007-10",
      "completion_date": "2008-12",
      "has_results": false,
      "last_update_posted_date": "2017-03-27",
      "last_synced_at": "2026-09-09T05:56:13.610Z",
      "location_count": 2,
      "location_summary": "Los Angeles, California • St Louis, Missouri",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "St Louis",
          "state": "Missouri"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00553397"
    },
    {
      "nct_id": "NCT01219296",
      "title": "Retrospective Database Studies",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "All Patients Undergoing Infertility Treatment"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Reproductive Medicine Associates of New Jersey",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "18 Years to 65 Years"
      },
      "enrollment_count": 1,
      "start_date": "2002-06",
      "completion_date": "2015-11",
      "has_results": false,
      "last_update_posted_date": "2015-11-17",
      "last_synced_at": "2026-09-09T05:56:13.610Z",
      "location_count": 1,
      "location_summary": "Basking Ridge, New Jersey",
      "locations": [
        {
          "city": "Basking Ridge",
          "state": "New Jersey"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01219296"
    },
    {
      "nct_id": "NCT05394324",
      "title": "A Post-market Clinical Study to Collect Safety and Performance Data on Johnson & Johnson Surgical Vision Products",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Refractive Error",
        "Glaucoma",
        "Cataracts",
        "Clear Lens Exchange"
      ],
      "interventions": [
        {
          "name": "Intervention",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Johnson & Johnson Surgical Vision, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 1674,
      "start_date": "2022-06-21",
      "completion_date": "2025-05-31",
      "has_results": false,
      "last_update_posted_date": "2025-07-20",
      "last_synced_at": "2026-09-09T05:56:13.610Z",
      "location_count": 4,
      "location_summary": "Dothan, Alabama • Bakersfield, California • Bloomington, Minnesota + 1 more",
      "locations": [
        {
          "city": "Dothan",
          "state": "Alabama"
        },
        {
          "city": "Bakersfield",
          "state": "California"
        },
        {
          "city": "Bloomington",
          "state": "Minnesota"
        },
        {
          "city": "McAllen",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05394324"
    },
    {
      "nct_id": "NCT01346150",
      "title": "Patients Treated for SCID (1968-Present)",
      "overall_status": "UNKNOWN",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "SCID",
        "ADA-SCID",
        "XSCID",
        "Leaky SCID",
        "Omenn Syndrome",
        "Reticular Dysgenesis"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "National Institute of Allergy and Infectious Diseases (NIAID)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 1007,
      "start_date": "2011-05-15",
      "completion_date": "2023-08",
      "has_results": false,
      "last_update_posted_date": "2020-11-12",
      "last_synced_at": "2026-09-09T05:56:13.610Z",
      "location_count": 31,
      "location_summary": "Birmingham, Alabama • Los Angeles, California • Palo Alto, California + 26 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Palo Alto",
          "state": "California"
        },
        {
          "city": "San Francisco",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01346150"
    },
    {
      "nct_id": "NCT04639817",
      "title": "Trimethoprim-Sulfamethoxazole vs Levofloxacin as Targeted Therapy for Stenotrophomonas Maltophilia Infections: a Retrospective Cohort Study",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Stenotrophomonas Infection"
      ],
      "interventions": [
        {
          "name": "Levofloxacin",
          "type": "DRUG"
        },
        {
          "name": "trimethoprim-sulfamethoxazole",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "National Institutes of Health Clinical Center (CC)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 1621,
      "start_date": "2020-08-14",
      "completion_date": "2021-04-27",
      "has_results": false,
      "last_update_posted_date": "2021-04-28",
      "last_synced_at": "2026-09-09T05:56:13.610Z",
      "location_count": 1,
      "location_summary": "Bethesda, Maryland",
      "locations": [
        {
          "city": "Bethesda",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04639817"
    },
    {
      "nct_id": "NCT03305562",
      "title": "Pediatric Hypertension Registry (PHREG)",
      "overall_status": "TERMINATED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Hypertension",
        "Pediatric Disorder"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Wake Forest University Health Sciences",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": "17 Years",
        "sex": "ALL",
        "summary": "Up to 17 Years"
      },
      "enrollment_count": 179,
      "start_date": "2017-09-20",
      "completion_date": "2021-06-22",
      "has_results": false,
      "last_update_posted_date": "2023-06-12",
      "last_synced_at": "2026-09-09T05:56:13.610Z",
      "location_count": 2,
      "location_summary": "Atlanta, Georgia • Winston-Salem, North Carolina",
      "locations": [
        {
          "city": "Atlanta",
          "state": "Georgia"
        },
        {
          "city": "Winston-Salem",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03305562"
    },
    {
      "nct_id": "NCT05604794",
      "title": "A Retrospective Effectiveness Trial of Ketamine-Assisted Psychotherapy in Adult Patients Coping With Mental Health",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Depression",
        "Anxiety",
        "Post Traumatic Stress Disorder"
      ],
      "interventions": [
        {
          "name": "Ketamine-Assisted Psychotherapy (KAP)",
          "type": "COMBINATION_PRODUCT"
        }
      ],
      "intervention_types": [
        "COMBINATION_PRODUCT"
      ],
      "sponsor": "Field Trip Health",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "19 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "19 Years and older"
      },
      "enrollment_count": 1806,
      "start_date": "2020-03-13",
      "completion_date": "2022-06-16",
      "has_results": true,
      "last_update_posted_date": "2024-03-20",
      "last_synced_at": "2026-09-09T05:56:13.610Z",
      "location_count": 8,
      "location_summary": "Los Angeles, California • San Diego, California • Washington D.C., District of Columbia + 5 more",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "San Diego",
          "state": "California"
        },
        {
          "city": "Washington D.C.",
          "state": "District of Columbia"
        },
        {
          "city": "Atlanta",
          "state": "Georgia"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05604794"
    },
    {
      "nct_id": "NCT07168694",
      "title": "A Real-world Study About the Impact of Siponimod Treatment on Secondary Progressive Multiple Sclerosis Patients in Russia",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Secondary Progressive Multiple Sclerosis"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Novartis Pharmaceuticals",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 606,
      "start_date": "2024-04-16",
      "completion_date": "2024-09-26",
      "has_results": false,
      "last_update_posted_date": "2025-09-11",
      "last_synced_at": "2026-09-09T05:56:13.610Z",
      "location_count": 1,
      "location_summary": "East Hanover, New Jersey",
      "locations": [
        {
          "city": "East Hanover",
          "state": "New Jersey"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07168694"
    },
    {
      "nct_id": "NCT04805229",
      "title": "A Difference-In-Differences Analysis of New Persistent Opioid Use After Surgery",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Opioid Use"
      ],
      "interventions": [
        {
          "name": "Retrospective analysis of opioid use after surgery",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of Michigan",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 30000,
      "start_date": "2013-01-01",
      "completion_date": "2019-12-31",
      "has_results": false,
      "last_update_posted_date": "2021-03-18",
      "last_synced_at": "2026-09-09T05:56:13.610Z",
      "location_count": 1,
      "location_summary": "Ann Arbor, Michigan",
      "locations": [
        {
          "city": "Ann Arbor",
          "state": "Michigan"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04805229"
    }
  ]
}