{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=observational+study&page=25",
    "query": {
      "intervention": "observational study",
      "page": 25
    },
    "page_size": 10
  },
  "pagination": {
    "page": 25,
    "page_size": 10,
    "total_count": 4385,
    "total_pages": 439,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=observational+study&page=26&page_size=10",
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=observational+study&page=24&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-10-20T00:19:40.283Z",
  "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": "NCT01177553",
      "title": "Randomized Clinical Trial: Expectant Management vs Laser Treatment of Monochorionic Twins With Severe Selective Intrauterine Growth Retardation and Absent or Reverse Diastolic Flow in the Umbilical Artery",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Intrauterine Growth Retardation"
      ],
      "interventions": [
        {
          "name": "selective laser photocoagulation of communicating vessels",
          "type": "PROCEDURE"
        },
        {
          "name": "Expected Management",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "PROCEDURE",
        "DEVICE"
      ],
      "sponsor": "University of South Florida",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "55 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 55 Years · Female only"
      },
      "enrollment_count": 5,
      "start_date": "2007-05",
      "completion_date": "2009-02",
      "has_results": true,
      "last_update_posted_date": "2013-02-21",
      "last_synced_at": "2026-10-20T00:19:40.283Z",
      "location_count": 2,
      "location_summary": "Los Angeles, California • Tampa, Florida",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Tampa",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01177553"
    },
    {
      "nct_id": "NCT05058651",
      "title": "Evaluating the Addition of the Immunotherapy Drug Atezolizumab to Standard Chemotherapy Treatment for Advanced or Metastatic Neuroendocrine Carcinomas That Originate Outside the Lung",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2",
        "PHASE3"
      ],
      "conditions": [
        "Advanced Extrapulmonary Neuroendocrine Carcinoma",
        "Metastatic Extrapulmonary Neuroendocrine Carcinoma",
        "Recurrent Extrapulmonary Neuroendocrine Carcinoma",
        "Unresectable Extrapulmonary Neuroendocrine Carcinoma"
      ],
      "interventions": [
        {
          "name": "Atezolizumab",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Biospecimen Collection",
          "type": "PROCEDURE"
        },
        {
          "name": "Carboplatin",
          "type": "DRUG"
        },
        {
          "name": "Cisplatin",
          "type": "DRUG"
        },
        {
          "name": "Computed Tomography",
          "type": "PROCEDURE"
        },
        {
          "name": "Etoposide",
          "type": "DRUG"
        },
        {
          "name": "Magnetic Resonance Imaging",
          "type": "PROCEDURE"
        },
        {
          "name": "Patient Observation",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL",
        "PROCEDURE",
        "DRUG",
        "OTHER"
      ],
      "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": 189,
      "start_date": "2022-06-28",
      "completion_date": "2028-10-01",
      "has_results": false,
      "last_update_posted_date": "2026-10-16",
      "last_synced_at": "2026-10-20T00:19:40.283Z",
      "location_count": 264,
      "location_summary": "Anchorage, Alaska • Phoenix, Arizona • Anaheim, California + 198 more",
      "locations": [
        {
          "city": "Anchorage",
          "state": "Alaska"
        },
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Anaheim",
          "state": "California"
        },
        {
          "city": "Auburn",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05058651"
    },
    {
      "nct_id": "NCT00688545",
      "title": "Naturalistic Safety Registry Of Celecoxib (CELEBREX(R)) And NSAIDs In Juvenile Idiopathic Arthritis",
      "overall_status": "TERMINATED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Arthritis, Juvenile Rheumatoid"
      ],
      "interventions": [
        {
          "name": "Celecoxib",
          "type": "DRUG"
        },
        {
          "name": "nsNSAIDs",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Pfizer's Upjohn has merged with Mylan to form Viatris Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "2 Years",
        "maximum_age": "17 Years",
        "sex": "ALL",
        "summary": "2 Years to 17 Years"
      },
      "enrollment_count": 275,
      "start_date": "2009-04",
      "completion_date": "2012-01",
      "has_results": true,
      "last_update_posted_date": "2021-02-02",
      "last_synced_at": "2026-10-20T00:19:40.283Z",
      "location_count": 27,
      "location_summary": "Phoenix, Arizona • Little Rock, Arkansas • Washington D.C., District of Columbia + 23 more",
      "locations": [
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Little Rock",
          "state": "Arkansas"
        },
        {
          "city": "Washington D.C.",
          "state": "District of Columbia"
        },
        {
          "city": "Arlington Heights",
          "state": "Illinois"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00688545"
    },
    {
      "nct_id": "NCT03913377",
      "title": "Ocular Characteristics in Contact Lens and Spectacle Wear",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Visual Acuity"
      ],
      "interventions": [
        {
          "name": "Spectacles",
          "type": "DEVICE"
        },
        {
          "name": "ACUVUE OASYS®1-Day with HydraLuxe™ Technology",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Johnson & Johnson Vision Care, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "42 Years",
        "sex": "ALL",
        "summary": "18 Years to 42 Years"
      },
      "enrollment_count": 78,
      "start_date": "2019-04-09",
      "completion_date": "2019-06-14",
      "has_results": true,
      "last_update_posted_date": "2021-02-04",
      "last_synced_at": "2026-10-20T00:19:40.283Z",
      "location_count": 3,
      "location_summary": "Jacksonville, Florida • Longwood, Florida • New York, New York",
      "locations": [
        {
          "city": "Jacksonville",
          "state": "Florida"
        },
        {
          "city": "Longwood",
          "state": "Florida"
        },
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03913377"
    },
    {
      "nct_id": "NCT07834294",
      "title": "Ventilation During CPR and Return of Spontaneous Circulation",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Cardiac Arrest (CA)"
      ],
      "interventions": [],
      "intervention_types": [],
      "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": 100,
      "start_date": "2023-09-11",
      "completion_date": "2025-01-04",
      "has_results": false,
      "last_update_posted_date": "2026-09-22",
      "last_synced_at": "2026-10-20T00:19:40.283Z",
      "location_count": 1,
      "location_summary": "Chicago, Illinois",
      "locations": [
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07834294"
    },
    {
      "nct_id": "NCT04014231",
      "title": "Novel Single Wave Assessment in Measuring Cardiac Dysfunction and Metabolic Syndrome in Patients With Cancer",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Malignant Neoplasm"
      ],
      "interventions": [
        {
          "name": "Diagnostic Imaging",
          "type": "PROCEDURE"
        },
        {
          "name": "Laboratory Biomarker Analysis",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "PROCEDURE",
        "OTHER"
      ],
      "sponsor": "City of Hope 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": 159,
      "start_date": "2017-07-28",
      "completion_date": "2026-04-20",
      "has_results": false,
      "last_update_posted_date": "2026-10-19",
      "last_synced_at": "2026-10-20T00:19:40.283Z",
      "location_count": 1,
      "location_summary": "Duarte, California",
      "locations": [
        {
          "city": "Duarte",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04014231"
    },
    {
      "nct_id": "NCT05561946",
      "title": "An Observational Study of Skin Reaction in Infants Using the Owlet Sock OSS 3.0",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Skin Injury"
      ],
      "interventions": [
        {
          "name": "Owlet OSS 3.0",
          "type": "DEVICE"
        }
      ],
      "intervention_types": [
        "DEVICE"
      ],
      "sponsor": "Owlet Baby Care, Inc.",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "44 Weeks",
        "maximum_age": "18 Months",
        "sex": "ALL",
        "summary": "44 Weeks to 18 Months"
      },
      "enrollment_count": 43,
      "start_date": "2021-12-21",
      "completion_date": "2022-08-24",
      "has_results": false,
      "last_update_posted_date": "2022-09-30",
      "last_synced_at": "2026-10-20T00:19:40.283Z",
      "location_count": 2,
      "location_summary": "Apopka, Florida • Shreveport, Louisiana",
      "locations": [
        {
          "city": "Apopka",
          "state": "Florida"
        },
        {
          "city": "Shreveport",
          "state": "Louisiana"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05561946"
    },
    {
      "nct_id": "NCT00093470",
      "title": "Tipifarnib in Treating Patients With Acute Myeloid Leukemia in Remission",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Acute Myeloid Leukemia Arising From Previous Myelodysplastic Syndrome",
        "Adult Acute Megakaryoblastic Leukemia",
        "Adult Acute Monocytic Leukemia",
        "Adult Acute Myeloid Leukemia in Remission",
        "Adult Acute Myeloid Leukemia With Inv(16)(p13.1q22); CBFB-MYH11",
        "Adult Acute Myeloid Leukemia With Maturation",
        "Adult Acute Myeloid Leukemia With Minimal Differentiation",
        "Adult Acute Myeloid Leukemia With t(16;16)(p13.1;q22); CBFB-MYH11",
        "Adult Acute Myeloid Leukemia With t(8;21); (q22; q22.1); RUNX1-RUNX1T1",
        "Adult Acute Myeloid Leukemia With t(9;11)(p22.3;q23.3); MLLT3-KMT2A",
        "Adult Acute Myeloid Leukemia Without Maturation",
        "Adult Acute Myelomonocytic Leukemia",
        "Adult Erythroleukemia",
        "Adult Pure Erythroid Leukemia",
        "Alkylating Agent-Related Acute Myeloid Leukemia",
        "Myelodysplastic Syndrome With Excess Blasts",
        "Recurrent Adult Acute Myeloid Leukemia"
      ],
      "interventions": [
        {
          "name": "Clinical Observation",
          "type": "PROCEDURE"
        },
        {
          "name": "Tipifarnib",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "PROCEDURE",
        "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": 144,
      "start_date": "2004-08-18",
      "completion_date": "2015-04-14",
      "has_results": true,
      "last_update_posted_date": "2026-07-14",
      "last_synced_at": "2026-10-20T00:19:40.283Z",
      "location_count": 339,
      "location_summary": "Birmingham, Alabama • Anchorage, Alaska • Scottsdale, Arizona + 228 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Anchorage",
          "state": "Alaska"
        },
        {
          "city": "Scottsdale",
          "state": "Arizona"
        },
        {
          "city": "San Diego",
          "state": "California"
        },
        {
          "city": "Aurora",
          "state": "Colorado"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00093470"
    },
    {
      "nct_id": "NCT01008527",
      "title": "Phase I Oncovir Poly IC:LC and NY-ESO-1/gp100",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Melanoma"
      ],
      "interventions": [
        {
          "name": "CP 870,893",
          "type": "DRUG"
        },
        {
          "name": "Peptides",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Oncovir poly IC:LC",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "DRUG",
        "BIOLOGICAL"
      ],
      "sponsor": "H. Lee Moffitt Cancer Center and Research Institute",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 22,
      "start_date": "2009-10",
      "completion_date": "2015-09",
      "has_results": false,
      "last_update_posted_date": "2015-09-24",
      "last_synced_at": "2026-10-20T00:19:40.283Z",
      "location_count": 1,
      "location_summary": "Tampa, Florida",
      "locations": [
        {
          "city": "Tampa",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01008527"
    },
    {
      "nct_id": "NCT06378866",
      "title": "Stereotactic Body Radiation Therapy Plus Immediate or Delayed Androgen Receptor Pathway Inhibitor and Androgen Deprivation Therapy or Salvage Radiation Therapy for the Treatment of Prostate Cancer, DIVINE Trial",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Recurrent Castration-Sensitive Prostate Carcinoma",
        "Recurrent Prostate Cancer",
        "Castration-resistant Prostate Cancer",
        "Biochemically Recurrent Prostate Carcinoma"
      ],
      "interventions": [
        {
          "name": "Abiraterone",
          "type": "DRUG"
        },
        {
          "name": "Apalutamide",
          "type": "DRUG"
        },
        {
          "name": "Biospecimen Collection",
          "type": "PROCEDURE"
        },
        {
          "name": "Bone Scan",
          "type": "PROCEDURE"
        },
        {
          "name": "Computed Tomography",
          "type": "PROCEDURE"
        },
        {
          "name": "Darolutamide",
          "type": "DRUG"
        },
        {
          "name": "Degarelix",
          "type": "DRUG"
        },
        {
          "name": "Enzalutamide",
          "type": "DRUG"
        },
        {
          "name": "Goserelin",
          "type": "DRUG"
        },
        {
          "name": "Histrelin",
          "type": "DRUG"
        },
        {
          "name": "Leuprolide",
          "type": "DRUG"
        },
        {
          "name": "Magnetic Resonance Imaging",
          "type": "PROCEDURE"
        },
        {
          "name": "Patient Observation",
          "type": "OTHER"
        },
        {
          "name": "Positron Emission Tomography",
          "type": "PROCEDURE"
        },
        {
          "name": "Prednisone",
          "type": "DRUG"
        },
        {
          "name": "Questionnaire Administration",
          "type": "OTHER"
        },
        {
          "name": "Relugolix",
          "type": "DRUG"
        },
        {
          "name": "Stereotactic Body Radiation Therapy",
          "type": "RADIATION"
        },
        {
          "name": "Triptorelin",
          "type": "DRUG"
        },
        {
          "name": "Radiation Therapy",
          "type": "RADIATION"
        },
        {
          "name": "Image-Guided Therapy",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "DRUG",
        "PROCEDURE",
        "OTHER",
        "RADIATION"
      ],
      "sponsor": "Mayo Clinic",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "MALE",
        "summary": "18 Years and older · Male only"
      },
      "enrollment_count": 532,
      "start_date": "2024-06-03",
      "completion_date": "2031-02-28",
      "has_results": false,
      "last_update_posted_date": "2026-07-20",
      "last_synced_at": "2026-10-20T00:19:40.283Z",
      "location_count": 3,
      "location_summary": "Phoenix, Arizona • Jacksonville, Florida • Rochester, Minnesota",
      "locations": [
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Jacksonville",
          "state": "Florida"
        },
        {
          "city": "Rochester",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06378866"
    }
  ]
}