{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=Observational+Study",
    "query": {
      "condition": "Observational Study"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 1974,
    "total_pages": 198,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=Observational+Study&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-07-24T07:31:26.623Z",
  "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": "NCT05966467",
      "title": "Registry of Patients With AQP4+ NMOSD Treated With Alexion C5 Inhibitor Therapies",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Neuromyelitis Optica Spectrum Disorder",
        "NMOSD",
        "AQP4+ NMOSD"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Alexion Pharmaceuticals, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 122,
      "start_date": "2024-02-01",
      "completion_date": "2029-09-27",
      "has_results": false,
      "last_update_posted_date": "2026-06-18",
      "last_synced_at": "2026-07-24T07:31:26.623Z",
      "location_count": 6,
      "location_summary": "Washington D.C., District of Columbia • Boston, Massachusetts • Chapel Hill, North Carolina + 3 more",
      "locations": [
        {
          "city": "Washington D.C.",
          "state": "District of Columbia"
        },
        {
          "city": "Boston",
          "state": "Massachusetts"
        },
        {
          "city": "Chapel Hill",
          "state": "North Carolina"
        },
        {
          "city": "Columbus",
          "state": "Ohio"
        },
        {
          "city": "Plano",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05966467"
    },
    {
      "nct_id": "NCT02212899",
      "title": "Prospective, Observational Registry of Renaissance-guided Spine Surgeries",
      "overall_status": "TERMINATED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Degenerative Spine Disease",
        "Spinal Deformity"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Mazor Robotics",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "6 Years",
        "maximum_age": "90 Years",
        "sex": "ALL",
        "summary": "6 Years to 90 Years"
      },
      "enrollment_count": 93,
      "start_date": "2015-02-18",
      "completion_date": "2016-12-30",
      "has_results": false,
      "last_update_posted_date": "2020-10-05",
      "last_synced_at": "2026-07-24T07:31:26.623Z",
      "location_count": 4,
      "location_summary": "Jacksonville, Florida • Memphis, Tennessee • Houston, Texas + 1 more",
      "locations": [
        {
          "city": "Jacksonville",
          "state": "Florida"
        },
        {
          "city": "Memphis",
          "state": "Tennessee"
        },
        {
          "city": "Houston",
          "state": "Texas"
        },
        {
          "city": "Reston",
          "state": "Virginia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02212899"
    },
    {
      "nct_id": "NCT03838900",
      "title": "The Loop Observational Study",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Diabetes Mellitus, Type 1"
      ],
      "interventions": [
        {
          "name": "Loop",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Jaeb Center for Health Research",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 1212,
      "start_date": "2019-01-17",
      "completion_date": "2020-04-25",
      "has_results": false,
      "last_update_posted_date": "2020-08-14",
      "last_synced_at": "2026-07-24T07:31:26.623Z",
      "location_count": 1,
      "location_summary": "Tampa, Florida",
      "locations": [
        {
          "city": "Tampa",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03838900"
    },
    {
      "nct_id": "NCT05520099",
      "title": "Observational Basket Trial to Collect Tissue to Develop and Train a Live Tumor Diagnostic Platform (ELEPHAS-02)",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Immunotherapy",
        "Cancer",
        "Bladder Cancer",
        "Urothelial Carcinoma Bladder",
        "Kidney Cancer",
        "Clear Cell Renal Cell Cancer (ccRCC)",
        "Colorectal Cancer",
        "MSI-H Colorectal Cancer",
        "DMMR Colorectal Cancer",
        "Head and Neck Cancer (H&N)",
        "Squamous Cell Carcinoma Head and Neck Cancer (HNSCC)",
        "Liver Cancer",
        "Hepatocellular Carcinoma (HCC)",
        "Lung Cancer (NSCLC)",
        "NSCLC (Non-small Cell Lung Cancer)",
        "Skin Cancer",
        "Cutaneous Melanoma",
        "Endometrial Cancer",
        "Solid Tumor Cancer"
      ],
      "interventions": [
        {
          "name": "Core Needle Biopsy, Forceps Biopsy, Punch Biopsy",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "PROCEDURE"
      ],
      "sponsor": "Elephas",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 416,
      "start_date": "2023-06-26",
      "completion_date": "2027-01",
      "has_results": false,
      "last_update_posted_date": "2026-06-29",
      "last_synced_at": "2026-07-24T07:31:26.623Z",
      "location_count": 12,
      "location_summary": "Little Rock, Arkansas • Salinas, California • Orlando, Florida + 9 more",
      "locations": [
        {
          "city": "Little Rock",
          "state": "Arkansas"
        },
        {
          "city": "Salinas",
          "state": "California"
        },
        {
          "city": "Orlando",
          "state": "Florida"
        },
        {
          "city": "Pembroke Pines",
          "state": "Florida"
        },
        {
          "city": "Stuart",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05520099"
    },
    {
      "nct_id": "NCT01338545",
      "title": "An Observational Study of Dosage Patterns in Routine Clinical Practice in Patients With Rheumatoid Arthritis (ACT-LIFE)",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Rheumatoid Arthritis"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Hoffmann-La Roche",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 400,
      "start_date": "2010-07",
      "completion_date": "2012-09",
      "has_results": false,
      "last_update_posted_date": "2016-11-02",
      "last_synced_at": "2026-07-24T07:31:26.623Z",
      "location_count": 1,
      "location_summary": "Coral Springs, Florida",
      "locations": [
        {
          "city": "Coral Springs",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01338545"
    },
    {
      "nct_id": "NCT04394234",
      "title": "A Study of Severe Uterine Bleeding Following Exposure to Direct Oral Anticoagulants",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Uterine Hemorrhage"
      ],
      "interventions": [
        {
          "name": "Direct oral anticoagulant (DOACs)",
          "type": "DRUG"
        },
        {
          "name": "Warfarin",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Janssen Research & Development, LLC",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "18 Years and older · Female only"
      },
      "enrollment_count": 961985,
      "start_date": "2020-05-15",
      "completion_date": "2020-06-01",
      "has_results": false,
      "last_update_posted_date": "2025-04-27",
      "last_synced_at": "2026-07-24T07:31:26.623Z",
      "location_count": 1,
      "location_summary": "Titusville, New Jersey",
      "locations": [
        {
          "city": "Titusville",
          "state": "New Jersey"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04394234"
    },
    {
      "nct_id": "NCT00096564",
      "title": "Brain Activities Associated With Different Facial Expressions Using Blood Oxygenation Level Dependent Functional MRI",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Healthy"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "National Institute of Neurological Disorders and Stroke (NINDS)",
      "sponsor_class": "NIH",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 25,
      "start_date": "2004-11-09",
      "completion_date": "2008-08-20",
      "has_results": false,
      "last_update_posted_date": "2017-07-02",
      "last_synced_at": "2026-07-24T07:31:26.623Z",
      "location_count": 1,
      "location_summary": "Bethesda, Maryland",
      "locations": [
        {
          "city": "Bethesda",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00096564"
    },
    {
      "nct_id": "NCT01703429",
      "title": "Complementary and Alternative Care in Multiple Sclerosis",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Multiple Sclerosis"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Bastyr University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "100 Years",
        "sex": "ALL",
        "summary": "18 Years to 100 Years"
      },
      "enrollment_count": 1000,
      "start_date": "2012-06",
      "completion_date": "2030-06",
      "has_results": false,
      "last_update_posted_date": "2020-02-11",
      "last_synced_at": "2026-07-24T07:31:26.623Z",
      "location_count": 1,
      "location_summary": "Kenmore, Washington",
      "locations": [
        {
          "city": "Kenmore",
          "state": "Washington"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01703429"
    },
    {
      "nct_id": "NCT00285831",
      "title": "Mild Depression 2 Week Observational Study",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Depressive Disorder"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "Stanford University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 36,
      "start_date": "2005-12",
      "completion_date": "2009-03",
      "has_results": false,
      "last_update_posted_date": "2019-09-09",
      "last_synced_at": "2026-07-24T07:31:26.623Z",
      "location_count": 1,
      "location_summary": "Stanford, California",
      "locations": [
        {
          "city": "Stanford",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00285831"
    },
    {
      "nct_id": "NCT07615400",
      "title": "A Long-Term Observational Study of Patients With Fucosidosis",
      "overall_status": "RECRUITING",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Fucosidosis"
      ],
      "interventions": [],
      "intervention_types": [],
      "sponsor": "JCR Pharmaceuticals Co., Ltd.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": null,
        "sex": "ALL",
        "summary": "Not listed"
      },
      "enrollment_count": 57,
      "start_date": "2026-03-25",
      "completion_date": "2031-01",
      "has_results": false,
      "last_update_posted_date": "2026-05-29",
      "last_synced_at": "2026-07-24T07:31:26.623Z",
      "location_count": 2,
      "location_summary": "Orange, California • Minneapolis, Minnesota",
      "locations": [
        {
          "city": "Orange",
          "state": "California"
        },
        {
          "city": "Minneapolis",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07615400"
    }
  ]
}