{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Observational+cohort+study&page=2",
    "query": {
      "intervention": "Observational cohort study",
      "page": 2
    },
    "page_size": 10
  },
  "pagination": {
    "page": 2,
    "page_size": 10,
    "total_count": 10,
    "total_pages": 1,
    "next_page_url": null,
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Observational+cohort+study&page=1&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-09-26T14:19:01.612Z",
  "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": "NCT00029913",
      "title": "A Study of Patients Who Develop HIV Infection After Enrolling in HIV Vaccine Trials or HIV Vaccine Preparedness Trials",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "HIV Infections"
      ],
      "interventions": [
        {
          "name": "Observation",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "HIV Vaccine Trials Network",
      "sponsor_class": "NETWORK",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 54,
      "start_date": "2002-04",
      "completion_date": "2009-07",
      "has_results": false,
      "last_update_posted_date": "2010-09-02",
      "last_synced_at": "2026-09-26T14:19:01.612Z",
      "location_count": 15,
      "location_summary": "Birmingham, Alabama • San Francisco, California • Baltimore, Maryland + 7 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "San Francisco",
          "state": "California"
        },
        {
          "city": "San Francisco",
          "state": "California"
        },
        {
          "city": "Baltimore",
          "state": "Maryland"
        },
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00029913"
    },
    {
      "nct_id": "NCT00238459",
      "title": "Controlling Acute or Early HIV Infection With Antiretroviral Drugs, Without a Candidate Vaccine.As Reported Previously, the Candidate Vaccie Was Not Provided by the Maufacturer as Promised",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "HIV Infections"
      ],
      "interventions": [
        {
          "name": "Patients elected to take licensed drugs. The vaccine was not provided for evaluation",
          "type": "DRUG"
        },
        {
          "name": "multiple licensed drugs not randomized",
          "type": "DRUG"
        },
        {
          "name": "multiple licensed antiretroviral drugs; not randomized",
          "type": "DRUG"
        },
        {
          "name": "Intended vaccine not provided, Licensed drugs provided, but were not investigated",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "National Institute of Allergy and Infectious Diseases (NIAID)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "65 Years",
        "sex": "ALL",
        "summary": "18 Years to 65 Years"
      },
      "enrollment_count": 58,
      "start_date": "2005-07",
      "completion_date": "2013-10",
      "has_results": false,
      "last_update_posted_date": "2013-11-20",
      "last_synced_at": "2026-09-26T14:19:01.612Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00238459"
    },
    {
      "nct_id": "NCT00951808",
      "title": "Preventing Acute Chest Syndrome by Transfusion Feasibility Study",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Sickle Cell Disease"
      ],
      "interventions": [
        {
          "name": "Single blood transfusion",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Standard care",
          "type": "BEHAVIORAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL",
        "BEHAVIORAL"
      ],
      "sponsor": "Carelon Research",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "2 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "2 Years and older"
      },
      "enrollment_count": 237,
      "start_date": "2009-07",
      "completion_date": "2010-07",
      "has_results": true,
      "last_update_posted_date": "2013-04-24",
      "last_synced_at": "2026-09-26T14:19:01.612Z",
      "location_count": 24,
      "location_summary": "Oakland, California • Wilmington, Delaware • Washington D.C., District of Columbia + 14 more",
      "locations": [
        {
          "city": "Oakland",
          "state": "California"
        },
        {
          "city": "Wilmington",
          "state": "Delaware"
        },
        {
          "city": "Washington D.C.",
          "state": "District of Columbia"
        },
        {
          "city": "Washington D.C.",
          "state": "District of Columbia"
        },
        {
          "city": "Atlanta",
          "state": "Georgia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00951808"
    },
    {
      "nct_id": "NCT01598597",
      "title": "An Observational Pilot Study Evaluating the Feasibility of Conducting Genome-Wide Association Studies Utilizing Subject Provided Information in Subjects With Locally Recurrent or MBC, MCRC, MNSCLC, RGBM or MRCC Treated With Avastin (Bevacizumab) (InVite)",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Breast Cancer",
        "Colorectal Cancer",
        "Non-Small Cell Lung Cancer",
        "Glioblastoma",
        "Renal Cell Cancer"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Genentech, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 276,
      "start_date": "2012-03",
      "completion_date": "2014-11",
      "has_results": false,
      "last_update_posted_date": "2015-05-08",
      "last_synced_at": "2026-09-26T14:19:01.612Z",
      "location_count": 50,
      "location_summary": "Many Locations, Alabama • Many Locations, Alaska • Many Locations, Arizona + 47 more",
      "locations": [
        {
          "city": "Many Locations",
          "state": "Alabama"
        },
        {
          "city": "Many Locations",
          "state": "Alaska"
        },
        {
          "city": "Many Locations",
          "state": "Arizona"
        },
        {
          "city": "Many Locations",
          "state": "Arkansas"
        },
        {
          "city": "Many Locations",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01598597"
    },
    {
      "nct_id": "NCT01647399",
      "title": "Vitamin D, Steroids, and Asthma in African American Youth",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Asthma",
        "Allergy"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Robert J. Freishtat",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "6 Years",
        "maximum_age": "20 Years",
        "sex": "ALL",
        "summary": "6 Years to 20 Years"
      },
      "enrollment_count": 273,
      "start_date": "2012-07",
      "completion_date": "2018-07",
      "has_results": false,
      "last_update_posted_date": "2019-03-28",
      "last_synced_at": "2026-09-26T14:19:01.612Z",
      "location_count": 1,
      "location_summary": "Washington D.C., District of Columbia",
      "locations": [
        {
          "city": "Washington D.C.",
          "state": "District of Columbia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01647399"
    },
    {
      "nct_id": "NCT07553234",
      "title": "Study to Understand Relationship Between Gut Health and Toxicities of Hormonal Breast Cancer Treatment",
      "overall_status": "NOT_YET_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Stool Sampling",
          "type": "OTHER"
        },
        {
          "name": "Chia Seeds",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of Chicago",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 20,
      "start_date": "2026-12-27",
      "completion_date": "2030-05-03",
      "has_results": false,
      "last_update_posted_date": "2026-05-04",
      "last_synced_at": "2026-09-26T14:19:01.612Z",
      "location_count": 1,
      "location_summary": "Chicago, Illinois",
      "locations": [
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07553234"
    },
    {
      "nct_id": "NCT00793975",
      "title": "Study of IMC-1121B in Patients With Tumors That Have Not Responded to Therapy",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Advanced Solid Tumors"
      ],
      "interventions": [
        {
          "name": "IMC-1121B",
          "type": "BIOLOGICAL"
        },
        {
          "name": "1121B",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "Eli Lilly and Company",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 37,
      "start_date": "2005-01",
      "completion_date": "2009-06",
      "has_results": false,
      "last_update_posted_date": "2013-08-19",
      "last_synced_at": "2026-09-26T14:19:01.612Z",
      "location_count": 2,
      "location_summary": "Aurora, Colorado • Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Aurora",
          "state": "Colorado"
        },
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00793975"
    },
    {
      "nct_id": "NCT06436846",
      "title": "Genomic Risk in Retroperitoneal Sarcoma",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Retroperitoneal Liposarcoma",
        "Soft Tissue Sarcoma"
      ],
      "interventions": [
        {
          "name": "Biospecimen sample collection during standard-of-care surgery",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Fox Chase Cancer Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 50,
      "start_date": "2022-03-07",
      "completion_date": "2027-08-01",
      "has_results": false,
      "last_update_posted_date": "2024-05-31",
      "last_synced_at": "2026-09-26T14:19:01.612Z",
      "location_count": 1,
      "location_summary": "Philadelphia, Pennsylvania",
      "locations": [
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06436846"
    },
    {
      "nct_id": "NCT00356460",
      "title": "Safety and Efficacy Study of GC1008 to Treat Renal Cell Carcinoma or Malignant Melanoma",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Carcinoma, Renal Cell",
        "Melanoma"
      ],
      "interventions": [
        {
          "name": "GC1008 Human Anti Transforming Growth Factor _Beta (TGFβ) Monoclonal Antibody",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL"
      ],
      "sponsor": "Genzyme, a Sanofi Company",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 29,
      "start_date": "2006-09",
      "completion_date": "2009-05",
      "has_results": false,
      "last_update_posted_date": "2014-03-19",
      "last_synced_at": "2026-09-26T14:19:01.612Z",
      "location_count": 6,
      "location_summary": "Bethesda, Maryland • Boston, Massachusetts • Cambridge, Massachusetts + 2 more",
      "locations": [
        {
          "city": "Bethesda",
          "state": "Maryland"
        },
        {
          "city": "Boston",
          "state": "Massachusetts"
        },
        {
          "city": "Boston",
          "state": "Massachusetts"
        },
        {
          "city": "Cambridge",
          "state": "Massachusetts"
        },
        {
          "city": "New Brunswick",
          "state": "New Jersey"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00356460"
    },
    {
      "nct_id": "NCT03378336",
      "title": "Psoriatic Arthritis Research Collaborative: Biologic Sub-Study",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Psoriatic Arthritis"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "University of Pennsylvania",
      "sponsor_class": "OTHER",
      "healthy_volunteers": null,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "89 Years",
        "sex": "ALL",
        "summary": "18 Years to 89 Years"
      },
      "enrollment_count": 171,
      "start_date": "2017-12-31",
      "completion_date": "2023-08-16",
      "has_results": true,
      "last_update_posted_date": "2025-05-09",
      "last_synced_at": "2026-09-26T14:19:01.612Z",
      "location_count": 4,
      "location_summary": "New York, New York • Cleveland, Ohio • Philadelphia, Pennsylvania + 1 more",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        },
        {
          "city": "Cleveland",
          "state": "Ohio"
        },
        {
          "city": "Philadelphia",
          "state": "Pennsylvania"
        },
        {
          "city": "Salt Lake City",
          "state": "Utah"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03378336"
    }
  ]
}