{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=observational",
    "query": {
      "intervention": "observational"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 4846,
    "total_pages": 485,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=observational&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-03T14:27:17.446Z",
  "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": "NCT02697487",
      "title": "UTSW Depression Cohort: A Longitudinal Study of Depression",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Depression",
        "Other Diagnoses, Comorbidities, and Complications"
      ],
      "interventions": [
        {
          "name": "No treatment",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "University of Texas Southwestern Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "10 Years",
        "maximum_age": "89 Years",
        "sex": "ALL",
        "summary": "10 Years to 89 Years"
      },
      "enrollment_count": 447,
      "start_date": "2016-02",
      "completion_date": "2018-03-22",
      "has_results": false,
      "last_update_posted_date": "2023-11-07",
      "last_synced_at": "2026-09-03T14:27:17.446Z",
      "location_count": 1,
      "location_summary": "Dallas, Texas",
      "locations": [
        {
          "city": "Dallas",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02697487"
    },
    {
      "nct_id": "NCT01121263",
      "title": "Hybrid Revascularization Observational Study",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Coronary Artery Disease"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Icahn School of Medicine at Mount Sinai",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 298,
      "start_date": "2010-05",
      "completion_date": "2013-08",
      "has_results": true,
      "last_update_posted_date": "2014-03-14",
      "last_synced_at": "2026-09-03T14:27:17.446Z",
      "location_count": 11,
      "location_summary": "Atlanta, Georgia • Baltimore, Maryland • Boston, Massachusetts + 8 more",
      "locations": [
        {
          "city": "Atlanta",
          "state": "Georgia"
        },
        {
          "city": "Baltimore",
          "state": "Maryland"
        },
        {
          "city": "Boston",
          "state": "Massachusetts"
        },
        {
          "city": "New York",
          "state": "New York"
        },
        {
          "city": "The Bronx",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01121263"
    },
    {
      "nct_id": "NCT00002649",
      "title": "Interleukin-2 or Observation Following Radiation Therapy, Combination Chemotherapy, and Peripheral Stem Cell Transplantation in Treating Patients With Recurrent Non-Hodgkin's Lymphoma",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Recurrent Adult Burkitt Lymphoma",
        "Recurrent Adult Diffuse Large Cell Lymphoma",
        "Recurrent Adult Diffuse Mixed Cell Lymphoma",
        "Recurrent Adult Diffuse Small Cleaved Cell Lymphoma",
        "Recurrent Adult Immunoblastic Large Cell Lymphoma",
        "Recurrent Grade 1 Follicular Lymphoma",
        "Recurrent Grade 2 Follicular Lymphoma",
        "Recurrent Grade 3 Follicular Lymphoma"
      ],
      "interventions": [
        {
          "name": "aldesleukin",
          "type": "BIOLOGICAL"
        },
        {
          "name": "filgrastim",
          "type": "BIOLOGICAL"
        },
        {
          "name": "cyclophosphamide",
          "type": "DRUG"
        },
        {
          "name": "etoposide",
          "type": "DRUG"
        },
        {
          "name": "radiation therapy",
          "type": "RADIATION"
        },
        {
          "name": "peripheral blood stem cell transplantation",
          "type": "PROCEDURE"
        },
        {
          "name": "bone marrow ablation with stem cell support",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL",
        "DRUG",
        "RADIATION",
        "PROCEDURE"
      ],
      "sponsor": "National Cancer Institute (NCI)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "16 Years",
        "maximum_age": "60 Years",
        "sex": "ALL",
        "summary": "16 Years to 60 Years"
      },
      "enrollment_count": 206,
      "start_date": "1995-05",
      "completion_date": null,
      "has_results": false,
      "last_update_posted_date": "2013-02-28",
      "last_synced_at": "2026-09-03T14:27:17.446Z",
      "location_count": 1,
      "location_summary": "San Antonio, Texas",
      "locations": [
        {
          "city": "San Antonio",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00002649"
    },
    {
      "nct_id": "NCT06581835",
      "title": "Accuracy Performance Verification of the INVOS™ PM7100 System in Adults",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Oxygen Saturation"
      ],
      "interventions": [
        {
          "name": "Observational",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Medtronic - MITG",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "50 Years",
        "sex": "ALL",
        "summary": "18 Years to 50 Years"
      },
      "enrollment_count": 42,
      "start_date": "2024-10-21",
      "completion_date": "2025-07-22",
      "has_results": false,
      "last_update_posted_date": "2025-07-25",
      "last_synced_at": "2026-09-03T14:27:17.446Z",
      "location_count": 1,
      "location_summary": "Durham, North Carolina",
      "locations": [
        {
          "city": "Durham",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06581835"
    },
    {
      "nct_id": "NCT04954625",
      "title": "Prolonged Air Leak (PAL) Autologous Blood Patch Intervention Trial",
      "overall_status": "ENROLLING_BY_INVITATION",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Lung Cancer"
      ],
      "interventions": [
        {
          "name": "Autologous Blood Patch",
          "type": "PROCEDURE"
        },
        {
          "name": "Standard of Care (per Physician)",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "PROCEDURE"
      ],
      "sponsor": "Rush University Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 60,
      "start_date": "2021-07-01",
      "completion_date": "2026-12-31",
      "has_results": false,
      "last_update_posted_date": "2025-10-10",
      "last_synced_at": "2026-09-03T14:27:17.446Z",
      "location_count": 1,
      "location_summary": "Chicago, Illinois",
      "locations": [
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04954625"
    },
    {
      "nct_id": "NCT02510040",
      "title": "A Prospective Observational Study of Adult Strabismus",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Convergence Insufficiency",
        "Divergence Insufficiency",
        "Hypertropia"
      ],
      "interventions": [
        {
          "name": "Prism",
          "type": "DEVICE"
        },
        {
          "name": "Orthoptic Exercises",
          "type": "OTHER"
        },
        {
          "name": "Eye Muscle Surgery",
          "type": "PROCEDURE"
        },
        {
          "name": "Botox Injection",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "DEVICE",
        "OTHER",
        "PROCEDURE"
      ],
      "sponsor": "Jaeb Center for Health Research",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 217,
      "start_date": "2015-08-17",
      "completion_date": "2019-01-31",
      "has_results": true,
      "last_update_posted_date": "2023-07-06",
      "last_synced_at": "2026-09-03T14:27:17.446Z",
      "location_count": 1,
      "location_summary": "Norfolk, Virginia",
      "locations": [
        {
          "city": "Norfolk",
          "state": "Virginia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02510040"
    },
    {
      "nct_id": "NCT01615068",
      "title": "An Observational Study in Patients With HER2 Positive Metastatic Breast Cancer (SystHERs Registry)",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Breast 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": 1007,
      "start_date": "2012-06-05",
      "completion_date": "2017-11-16",
      "has_results": false,
      "last_update_posted_date": "2018-07-16",
      "last_synced_at": "2026-09-03T14:27:17.446Z",
      "location_count": 142,
      "location_summary": "Birmingham, Alabama • Mobile, Alabama • Sedona, Arizona + 128 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Mobile",
          "state": "Alabama"
        },
        {
          "city": "Sedona",
          "state": "Arizona"
        },
        {
          "city": "Tucson",
          "state": "Arizona"
        },
        {
          "city": "Hot Springs",
          "state": "Arkansas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01615068"
    },
    {
      "nct_id": "NCT06238648",
      "title": "Epcoritamab Compared to Observation for Treating B-cell Lymphoma Patients Not in Complete Remission After CD19-directed CAR-T Therapy",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Diffuse Large B-Cell Lymphoma, Not Otherwise Specified",
        "Primary Mediastinal Large B-Cell Lymphoma",
        "Transformed Indolent B-Cell Non-Hodgkin Lymphoma to Diffuse Large B-Cell Lymphoma"
      ],
      "interventions": [
        {
          "name": "Biopsy",
          "type": "PROCEDURE"
        },
        {
          "name": "Biospecimen Collection",
          "type": "PROCEDURE"
        },
        {
          "name": "Computed Tomography",
          "type": "PROCEDURE"
        },
        {
          "name": "Epcoritamab",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Magnetic Resonance Imaging",
          "type": "PROCEDURE"
        },
        {
          "name": "Patient Observation",
          "type": "OTHER"
        },
        {
          "name": "Positron Emission Tomography",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "PROCEDURE",
        "BIOLOGICAL",
        "OTHER"
      ],
      "sponsor": "Academic and Community Cancer Research United",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 120,
      "start_date": "2024-01-31",
      "completion_date": "2030-12-31",
      "has_results": false,
      "last_update_posted_date": "2024-09-26",
      "last_synced_at": "2026-09-03T14:27:17.446Z",
      "location_count": 6,
      "location_summary": "Rochester, Minnesota • St Louis, Missouri • Hackensack, New Jersey + 3 more",
      "locations": [
        {
          "city": "Rochester",
          "state": "Minnesota"
        },
        {
          "city": "St Louis",
          "state": "Missouri"
        },
        {
          "city": "Hackensack",
          "state": "New Jersey"
        },
        {
          "city": "New York",
          "state": "New York"
        },
        {
          "city": "Chapel Hill",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06238648"
    },
    {
      "nct_id": "NCT02652052",
      "title": "Hematopoietic Stem Cell Transplant Survivors Study",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Stem Cell Transplant"
      ],
      "interventions": [
        {
          "name": "Standard of Care - Observation Only",
          "type": "OTHER"
        },
        {
          "name": "Group 2: Quercetin",
          "type": "DRUG"
        },
        {
          "name": "Group 2: Dasatinib",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "OTHER",
        "DRUG"
      ],
      "sponsor": "Mayo Clinic",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 9,
      "start_date": "2016-03-01",
      "completion_date": "2023-05-23",
      "has_results": false,
      "last_update_posted_date": "2025-01-15",
      "last_synced_at": "2026-09-03T14:27:17.446Z",
      "location_count": 1,
      "location_summary": "Rochester, Minnesota",
      "locations": [
        {
          "city": "Rochester",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02652052"
    },
    {
      "nct_id": "NCT03145025",
      "title": "Corneal Endothelial Cell Density in Eyes Treated With a Fluocinolone Acetonide Intravitreal Implant",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Uveitis, Posterior"
      ],
      "interventions": [
        {
          "name": "Retisert",
          "type": "DEVICE"
        },
        {
          "name": "Fluocinolone Acetonide Intravitreal Implant",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DEVICE",
        "DRUG"
      ],
      "sponsor": "Bausch & Lomb Incorporated",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "12 Years",
        "maximum_age": "80 Years",
        "sex": "ALL",
        "summary": "12 Years to 80 Years"
      },
      "enrollment_count": 3,
      "start_date": "2017-07-14",
      "completion_date": "2019-03-22",
      "has_results": false,
      "last_update_posted_date": "2019-06-21",
      "last_synced_at": "2026-09-03T14:27:17.446Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03145025"
    }
  ]
}