{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=observational+study&page=18",
    "query": {
      "intervention": "observational study",
      "page": 18
    },
    "page_size": 10
  },
  "pagination": {
    "page": 18,
    "page_size": 10,
    "total_count": 4385,
    "total_pages": 439,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=observational+study&page=19&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=observational+study&page=17&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-19T17:06:58.837Z",
  "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": "NCT03640221",
      "title": "Ertugliflozin Versus Hydrochlorothiazide in Reducing Sympathetic Neural Overactivity in Patients With Hypertension and Recently-diagnosed Type 2 Diabetes.",
      "overall_status": "WITHDRAWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Hypertension",
        "Diabetes Mellitus, Type 2"
      ],
      "interventions": [
        {
          "name": "Ertugliflozin",
          "type": "DRUG"
        },
        {
          "name": "Hydrochlorothiazide 12.5mg",
          "type": "DRUG"
        },
        {
          "name": "Microneurography",
          "type": "DEVICE"
        },
        {
          "name": "SKNA recordings",
          "type": "OTHER"
        },
        {
          "name": "Static Handgrip",
          "type": "OTHER"
        },
        {
          "name": "Post-handgrip forearm vascular occlusion",
          "type": "OTHER"
        },
        {
          "name": "Testing of the Arterial Baroreflex Function",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "DEVICE",
        "OTHER"
      ],
      "sponsor": "Cedars-Sinai Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "35 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "35 Years to 65 Years"
      },
      "enrollment_count": 0,
      "start_date": "2018-09-01",
      "completion_date": "2020-08-31",
      "has_results": false,
      "last_update_posted_date": "2020-01-14",
      "last_synced_at": "2026-10-19T17:06:58.837Z",
      "location_count": 1,
      "location_summary": "Los Angeles, California",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03640221"
    },
    {
      "nct_id": "NCT06285747",
      "title": "A Correlational Study: Breast Cancer-related Chest Wall Lymphedema, Quality of Life, and Shoulder Function",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Breast Carcinoma"
      ],
      "interventions": [
        {
          "name": "Non-Interventional Study",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Mayo Clinic",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "Female only"
      },
      "enrollment_count": 85,
      "start_date": "2023-07-28",
      "completion_date": "2025-06-03",
      "has_results": false,
      "last_update_posted_date": "2025-08-26",
      "last_synced_at": "2026-10-19T17:06:58.837Z",
      "location_count": 1,
      "location_summary": "Rochester, Minnesota",
      "locations": [
        {
          "city": "Rochester",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06285747"
    },
    {
      "nct_id": "NCT07450664",
      "title": "Observational Study of VYKAT™ XR in Patients With Prader-Willi Syndrome",
      "overall_status": "ENROLLING_BY_INVITATION",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Prader-Willi Syndrome"
      ],
      "interventions": [
        {
          "name": "VYKAT XR",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Soleno Therapeutics, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "4 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "4 Years and older"
      },
      "enrollment_count": 200,
      "start_date": "2025-11-26",
      "completion_date": "2028-03-02",
      "has_results": false,
      "last_update_posted_date": "2026-10-14",
      "last_synced_at": "2026-10-19T17:06:58.837Z",
      "location_count": 25,
      "location_summary": "Phoenix, Arizona • Los Angeles, California • Sacramento, California + 22 more",
      "locations": [
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Sacramento",
          "state": "California"
        },
        {
          "city": "Aurora",
          "state": "Colorado"
        },
        {
          "city": "Gainesville",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07450664"
    },
    {
      "nct_id": "NCT02845687",
      "title": "Study on Smoking Cessation and Cost Outcomes in the Duke Smoking Cessation Program",
      "overall_status": "TERMINATED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Nicotine Dependence"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Duke University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 209,
      "start_date": "2016-08-16",
      "completion_date": "2018-05-29",
      "has_results": false,
      "last_update_posted_date": "2019-09-13",
      "last_synced_at": "2026-10-19T17:06:58.837Z",
      "location_count": 1,
      "location_summary": "Durham, North Carolina",
      "locations": [
        {
          "city": "Durham",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02845687"
    },
    {
      "nct_id": "NCT06625684",
      "title": "Key Longitudinal Associations With Risk and Glioblastoma Outcomes",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Glioblastoma"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Duke University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 200,
      "start_date": "2024-12-10",
      "completion_date": "2029-12-10",
      "has_results": false,
      "last_update_posted_date": "2026-01-20",
      "last_synced_at": "2026-10-19T17:06:58.837Z",
      "location_count": 1,
      "location_summary": "Durham, North Carolina",
      "locations": [
        {
          "city": "Durham",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06625684"
    },
    {
      "nct_id": "NCT07849907",
      "title": "The Parasite and Infestation Study",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Parasite and Infestation Physician-Patient Diagnostic Incongruency"
      ],
      "interventions": [
        {
          "name": "No intervention - observational study",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Vanderbilt University Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "70 Years",
        "sex": "ALL",
        "summary": "18 Years to 70 Years"
      },
      "enrollment_count": 25,
      "start_date": "2024-12-31",
      "completion_date": "2030-12",
      "has_results": false,
      "last_update_posted_date": "2026-09-30",
      "last_synced_at": "2026-10-19T17:06:58.837Z",
      "location_count": 1,
      "location_summary": "Nashville, Tennessee",
      "locations": [
        {
          "city": "Nashville",
          "state": "Tennessee"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07849907"
    },
    {
      "nct_id": "NCT04147234",
      "title": "A Study to Find the Best Dose of BI 1387446 Alone or in Combination With Ezabenlimab (BI 754091) in Patients With Different Types of Advanced or Metastatic Cancer (Solid Tumors)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Neoplasms"
      ],
      "interventions": [
        {
          "name": "BI 1387446 50 μg",
          "type": "DRUG"
        },
        {
          "name": "BI 754091",
          "type": "DRUG"
        },
        {
          "name": "BI 1387446 100 μg",
          "type": "DRUG"
        },
        {
          "name": "BI 1387446 200 μg",
          "type": "DRUG"
        },
        {
          "name": "BI 1387446 400 μg",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Boehringer Ingelheim",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 42,
      "start_date": "2020-08-03",
      "completion_date": "2024-03-21",
      "has_results": true,
      "last_update_posted_date": "2025-08-19",
      "last_synced_at": "2026-10-19T17:06:58.837Z",
      "location_count": 2,
      "location_summary": "Chapel Hill, North Carolina • Milwaukee, Wisconsin",
      "locations": [
        {
          "city": "Chapel Hill",
          "state": "North Carolina"
        },
        {
          "city": "Milwaukee",
          "state": "Wisconsin"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04147234"
    },
    {
      "nct_id": "NCT02788409",
      "title": "Incidence of Second Primary Malignancies in Castration-Resistant Prostate Cancer: An Observational Retrospective Cohort Study in the US",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Prostatic Neoplasms"
      ],
      "interventions": [
        {
          "name": "Not applicable for study",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Bayer",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "65 Years",
        "maximum_age": null,
        "sex": "MALE",
        "summary": "65 Years and older · Male only"
      },
      "enrollment_count": 2234,
      "start_date": "2016-05-15",
      "completion_date": "2018-05-09",
      "has_results": false,
      "last_update_posted_date": "2019-05-08",
      "last_synced_at": "2026-10-19T17:06:58.837Z",
      "location_count": 1,
      "location_summary": "Waltham, Massachusetts",
      "locations": [
        {
          "city": "Waltham",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02788409"
    },
    {
      "nct_id": "NCT03127787",
      "title": "Clinical Performance Evaluation of DxN CMV Assay",
      "overall_status": "TERMINATED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Cytomegalovirus"
      ],
      "interventions": [
        {
          "name": "CMV Assay",
          "type": "DIAGNOSTIC_TEST"
        }
      ],
      "intervention_types": [
        "DIAGNOSTIC_TEST"
      ],
      "sponsor": "Beckman Coulter, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 19,
      "start_date": "2016-06",
      "completion_date": "2017-08-30",
      "has_results": false,
      "last_update_posted_date": "2018-07-12",
      "last_synced_at": "2026-10-19T17:06:58.837Z",
      "location_count": 4,
      "location_summary": "Los Angeles, California • Chicago, Illinois • Indianapolis, Indiana + 1 more",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        },
        {
          "city": "Indianapolis",
          "state": "Indiana"
        },
        {
          "city": "Rochester",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03127787"
    },
    {
      "nct_id": "NCT05617014",
      "title": "Alzheimer's Disease Neuroimaging Initiative 4",
      "overall_status": "ENROLLING_BY_INVITATION",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Mild Cognitive Impairment",
        "Alzheimer Disease",
        "Dementia"
      ],
      "interventions": [
        {
          "name": "Neuraceq",
          "type": "RADIATION"
        },
        {
          "name": "Amyvid",
          "type": "RADIATION"
        },
        {
          "name": "Tauvid",
          "type": "RADIATION"
        },
        {
          "name": "MK-6240",
          "type": "RADIATION"
        },
        {
          "name": "NAV4694",
          "type": "RADIATION"
        },
        {
          "name": "PI-2620",
          "type": "RADIATION"
        }
      ],
      "intervention_types": [
        "RADIATION"
      ],
      "sponsor": "University of Southern California",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "55 Years",
        "maximum_age": "90 Years",
        "sex": "ALL",
        "summary": "55 Years to 90 Years"
      },
      "enrollment_count": 1500,
      "start_date": "2023-06-09",
      "completion_date": "2027-07-31",
      "has_results": false,
      "last_update_posted_date": "2026-09-29",
      "last_synced_at": "2026-10-19T17:06:58.837Z",
      "location_count": 62,
      "location_summary": "Birmingham, Alabama • Phoenix, Arizona • Sun City, Arizona + 46 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Sun City",
          "state": "Arizona"
        },
        {
          "city": "Irvine",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05617014"
    }
  ]
}