{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=Observational+Study&page=4",
    "query": {
      "condition": "Observational Study",
      "page": 4
    },
    "page_size": 10
  },
  "pagination": {
    "page": 4,
    "page_size": 10,
    "total_count": 2011,
    "total_pages": 202,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=Observational+Study&page=5&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=Observational+Study&page=3&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-30T02:35:38.828Z",
  "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": "NCT00808808",
      "title": "Assessing Choice in the Employer Setting (ACES) Study",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Healthy"
      ],
      "interventions": [
        {
          "name": "Choice of TIV or FluMist with baseline advertisement",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Choice of TIV or FluMist with enhanced advertisement and incentives",
          "type": "OTHER"
        },
        {
          "name": "Control - Usual care offering TIV only with baseline advertisement",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL",
        "OTHER"
      ],
      "sponsor": "MedImmune LLC",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 4411,
      "start_date": "2008-09",
      "completion_date": "2008-12",
      "has_results": true,
      "last_update_posted_date": "2013-11-20",
      "last_synced_at": "2026-10-30T02:35:38.828Z",
      "location_count": 47,
      "location_summary": "Chatsworth, California • Novato, California • Sacramento, California + 34 more",
      "locations": [
        {
          "city": "Chatsworth",
          "state": "California"
        },
        {
          "city": "Novato",
          "state": "California"
        },
        {
          "city": "Sacramento",
          "state": "California"
        },
        {
          "city": "Sacramento",
          "state": "California"
        },
        {
          "city": "San Francisco",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00808808"
    },
    {
      "nct_id": "NCT06697925",
      "title": "Evaluating the Durability of Closure for Venous Leg Ulcers",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Venous Leg",
        "Venous Leg Ulcer (VLU)",
        "Venous Leg Ulcer",
        "Venous Ulcer",
        "VLU"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Kerecis Ltd.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 150,
      "start_date": "2025-01",
      "completion_date": "2026-12",
      "has_results": false,
      "last_update_posted_date": "2025-01-24",
      "last_synced_at": "2026-10-30T02:35:38.828Z",
      "location_count": 1,
      "location_summary": "Monroeville, Pennsylvania",
      "locations": [
        {
          "city": "Monroeville",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06697925"
    },
    {
      "nct_id": "NCT00734591",
      "title": "Follow-Up Study for Exubera",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Diabetes Mellitus"
      ],
      "interventions": [
        {
          "name": "Exubera",
          "type": "DRUG"
        },
        {
          "name": "Randomized diabetes therapy",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "Pfizer",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 7439,
      "start_date": "2008-08",
      "completion_date": "2012-01",
      "has_results": true,
      "last_update_posted_date": "2012-10-23",
      "last_synced_at": "2026-10-30T02:35:38.828Z",
      "location_count": 131,
      "location_summary": "Bay Minette, Alabama • Graysville, Alabama • Pell City, Alabama + 111 more",
      "locations": [
        {
          "city": "Bay Minette",
          "state": "Alabama"
        },
        {
          "city": "Graysville",
          "state": "Alabama"
        },
        {
          "city": "Pell City",
          "state": "Alabama"
        },
        {
          "city": "Pell City",
          "state": "Alabama"
        },
        {
          "city": "Glendale",
          "state": "Arizona"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00734591"
    },
    {
      "nct_id": "NCT00443274",
      "title": "Safety Follow-up Study in Subjects With Silicone Gel-filled Breast Implants as Compared Both to Saline-filled Breast Implants and to National Norms",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Breast Implant"
      ],
      "interventions": [
        {
          "name": "NBIR - US National Breast Implant Registry",
          "type": "OTHER"
        },
        {
          "name": "410 Arm",
          "type": "DEVICE"
        },
        {
          "name": "BIFs - Breast Implant Follow-Up Study",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "OTHER",
        "DEVICE"
      ],
      "sponsor": "Allergan",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "99 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 99 Years · Female only"
      },
      "enrollment_count": 56460,
      "start_date": "2006-11-01",
      "completion_date": "2029-12-31",
      "has_results": false,
      "last_update_posted_date": "2025-07-16",
      "last_synced_at": "2026-10-30T02:35:38.828Z",
      "location_count": 1,
      "location_summary": "El Paso, Texas",
      "locations": [
        {
          "city": "El Paso",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00443274"
    },
    {
      "nct_id": "NCT00388674",
      "title": "Study of Entecavir in Patients With Chronic Hepatitis B Virus (HBV) Infection",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Chronic Hepatitis B"
      ],
      "interventions": [
        {
          "name": "entecavir",
          "type": "DRUG"
        },
        {
          "name": "Other anti-HBV medication",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Bristol-Myers Squibb",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "16 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "16 Years and older"
      },
      "enrollment_count": 12522,
      "start_date": "2006-12-18",
      "completion_date": "2016-10-26",
      "has_results": true,
      "last_update_posted_date": "2018-07-30",
      "last_synced_at": "2026-10-30T02:35:38.828Z",
      "location_count": 20,
      "location_summary": "Coronado, California • Los Angeles, California • San Francisco, California + 14 more",
      "locations": [
        {
          "city": "Coronado",
          "state": "California"
        },
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "San Francisco",
          "state": "California"
        },
        {
          "city": "Farmington",
          "state": "Connecticut"
        },
        {
          "city": "Miami",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00388674"
    },
    {
      "nct_id": "NCT03442582",
      "title": "Afluria Pregnancy Registry",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Influenza, Human",
        "Pregnancy",
        "Birth Defect"
      ],
      "interventions": [
        {
          "name": "Afluria Influenza Vaccine",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "Seqirus",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "Female only"
      },
      "enrollment_count": 490,
      "start_date": "2017-09-08",
      "completion_date": "2021-09-14",
      "has_results": false,
      "last_update_posted_date": "2022-02-09",
      "last_synced_at": "2026-10-30T02:35:38.828Z",
      "location_count": 1,
      "location_summary": "Wilmington, North Carolina",
      "locations": [
        {
          "city": "Wilmington",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03442582"
    },
    {
      "nct_id": "NCT02193282",
      "title": "Erlotinib Hydrochloride in Treating Patients With Stage IB-IIIA Non-small Cell Lung Cancer That Has Been Completely Removed by Surgery (An ALCHEMIST Treatment Trial)",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Lung Non-Squamous Non-Small Cell Carcinoma",
        "Stage IB Lung Non-Small Cell Carcinoma AJCC v7",
        "Stage II Lung Non-Small Cell Cancer AJCC v7",
        "Stage IIA Lung Non-Small Cell Carcinoma AJCC v7",
        "Stage IIB Lung Non-Small Cell Carcinoma AJCC v7",
        "Stage IIIA Lung Non-Small Cell Cancer AJCC v7"
      ],
      "interventions": [
        {
          "name": "Clinical Observation",
          "type": "OTHER"
        },
        {
          "name": "Erlotinib Hydrochloride",
          "type": "DRUG"
        },
        {
          "name": "Laboratory Biomarker Analysis",
          "type": "OTHER"
        },
        {
          "name": "Placebo Administration",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER",
        "DRUG"
      ],
      "sponsor": "National Cancer Institute (NCI)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 390,
      "start_date": "2015-02-11",
      "completion_date": "2027-02-03",
      "has_results": false,
      "last_update_posted_date": "2026-07-02",
      "last_synced_at": "2026-10-30T02:35:38.828Z",
      "location_count": 1403,
      "location_summary": "Birmingham, Alabama • Daphne, Alabama • Mobile, Alabama + 888 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Daphne",
          "state": "Alabama"
        },
        {
          "city": "Mobile",
          "state": "Alabama"
        },
        {
          "city": "Mobile",
          "state": "Alabama"
        },
        {
          "city": "Mobile",
          "state": "Alabama"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02193282"
    },
    {
      "nct_id": "NCT05687578",
      "title": "PUER (\"Previously Unrecognized Emerging Risks\") Life Clinical Study",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Aging"
      ],
      "interventions": [
        {
          "name": "Measurements Only",
          "type": "DIAGNOSTIC_TEST"
        }
      ],
      "intervention_types": [
        "DIAGNOSTIC_TEST"
      ],
      "sponsor": "Puer Research, LLC",
      "sponsor_class": "NETWORK",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "90 Years",
        "sex": "ALL",
        "summary": "18 Years to 90 Years"
      },
      "enrollment_count": 35,
      "start_date": "2023-03-27",
      "completion_date": "2026-07-31",
      "has_results": false,
      "last_update_posted_date": "2026-09-22",
      "last_synced_at": "2026-10-30T02:35:38.828Z",
      "location_count": 1,
      "location_summary": "Atlanta, Georgia",
      "locations": [
        {
          "city": "Atlanta",
          "state": "Georgia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05687578"
    },
    {
      "nct_id": "NCT04427384",
      "title": "Registry of Patients With Brain Tumors Treated With STaRT (GammaTiles)",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Brain Tumor, Recurrent",
        "Brain Tumor",
        "Brain Tumor, Primary",
        "Brain Tumor - Metastatic",
        "Brain Tumor, Adult: Glioblastoma",
        "Brain Tumor, Adult Meningioma"
      ],
      "interventions": [
        {
          "name": "GammaTile",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "GT Medical Technologies, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 600,
      "start_date": "2020-09-11",
      "completion_date": "2028-12-31",
      "has_results": false,
      "last_update_posted_date": "2026-07-22",
      "last_synced_at": "2026-10-30T02:35:38.828Z",
      "location_count": 53,
      "location_summary": "Phoenix, Arizona • Little Rock, Arkansas • Castro Valley, California + 45 more",
      "locations": [
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Little Rock",
          "state": "Arkansas"
        },
        {
          "city": "Castro Valley",
          "state": "California"
        },
        {
          "city": "La Jolla",
          "state": "California"
        },
        {
          "city": "Laguna Hills",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04427384"
    },
    {
      "nct_id": "NCT04706533",
      "title": "Michigan Medicine COVID-19 Cohort: Clinical Characteristics, Inflammatory Markers and Outcomes of Patients Hospitalized for COVID-19",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Covid19",
        "Kidney Diseases",
        "Inflammation",
        "SARS-CoV Infection"
      ],
      "interventions": [
        {
          "name": "Biomarkers of inflammation",
          "type": "DIAGNOSTIC_TEST"
        }
      ],
      "intervention_types": [
        "DIAGNOSTIC_TEST"
      ],
      "sponsor": "University of Michigan",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 3402,
      "start_date": "2020-03-23",
      "completion_date": "2022-12-01",
      "has_results": false,
      "last_update_posted_date": "2023-10-31",
      "last_synced_at": "2026-10-30T02:35:38.828Z",
      "location_count": 1,
      "location_summary": "Ann Arbor, Michigan",
      "locations": [
        {
          "city": "Ann Arbor",
          "state": "Michigan"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04706533"
    }
  ]
}