{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=Unknown+Primary+Tumor",
    "query": {
      "condition": "Unknown Primary Tumor"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 100,
    "total_pages": 10,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=Unknown+Primary+Tumor&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-06-26T17:38:38.737Z",
  "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": "NCT01274338",
      "title": "Ipilimumab or High-Dose Interferon Alfa-2b in Treating Patients With High-Risk Stage III-IV Melanoma That Has Been Removed by Surgery",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Melanoma of Unknown Primary",
        "Recurrent Melanoma",
        "Stage IIIB Cutaneous Melanoma AJCC v7",
        "Stage IIIC Cutaneous Melanoma AJCC v7",
        "Stage IV Cutaneous Melanoma AJCC v6 and v7"
      ],
      "interventions": [
        {
          "name": "Ipilimumab",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Quality-of-Life Assessment",
          "type": "OTHER"
        },
        {
          "name": "Recombinant Interferon Alfa-2b",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL",
        "OTHER"
      ],
      "sponsor": "National Cancer Institute (NCI)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "12 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "12 Years and older"
      },
      "enrollment_count": 1673,
      "start_date": "2011-06-17",
      "completion_date": "2027-02-02",
      "has_results": true,
      "last_update_posted_date": "2026-06-26",
      "last_synced_at": "2026-06-26T17:38:38.737Z",
      "location_count": 929,
      "location_summary": "Birmingham, Alabama • Mobile, Alabama • Anchorage, Alaska + 581 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Mobile",
          "state": "Alabama"
        },
        {
          "city": "Mobile",
          "state": "Alabama"
        },
        {
          "city": "Anchorage",
          "state": "Alaska"
        },
        {
          "city": "Anchorage",
          "state": "Alaska"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01274338"
    },
    {
      "nct_id": "NCT00020579",
      "title": "MS-275 in Treating Patients With Advanced Solid Tumors or Lymphoma",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Cancer"
      ],
      "interventions": [
        {
          "name": "entinostat",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "National Institutes of Health Clinical Center (CC)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 75,
      "start_date": "2001-03",
      "completion_date": "2008-10",
      "has_results": false,
      "last_update_posted_date": "2012-03-15",
      "last_synced_at": "2026-06-26T17:38:38.737Z",
      "location_count": 3,
      "location_summary": "Bethesda, Maryland",
      "locations": [
        {
          "city": "Bethesda",
          "state": "Maryland"
        },
        {
          "city": "Bethesda",
          "state": "Maryland"
        },
        {
          "city": "Bethesda",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00020579"
    },
    {
      "nct_id": "NCT00004922",
      "title": "Irinotecan in Treating Patients With Advanced Neuroendocrine Tumors",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Carcinoma of Unknown Primary",
        "Neuroendocrine Carcinoma",
        "Neuroendocrine Carcinoma of the Skin"
      ],
      "interventions": [
        {
          "name": "irinotecan hydrochloride",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Memorial Sloan Kettering Cancer Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": null,
      "start_date": "1999-06",
      "completion_date": "2002-06",
      "has_results": false,
      "last_update_posted_date": "2013-06-19",
      "last_synced_at": "2026-06-26T17:38:38.737Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00004922"
    },
    {
      "nct_id": "NCT02978625",
      "title": "Talimogene Laherparepvec and Nivolumab in Treating Patients With Refractory Lymphomas or Advanced or Refractory Non-melanoma Skin Cancers",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Anaplastic Large Cell Lymphoma, ALK-Negative",
        "Anaplastic Large Cell Lymphoma, ALK-Positive",
        "Apocrine Carcinoma",
        "Carcinoma Arising From Cylindroma",
        "Carcinoma Arising From Spiradenoma",
        "Digital Papillary Adenocarcinoma",
        "Endocrine Mucin-Producing Sweat Gland Carcinoma",
        "Extramammary Paget Disease",
        "Extraocular Sebaceous Carcinoma",
        "Hidradenocarcinoma",
        "Malignant Sweat Gland Neoplasm",
        "Merkel Cell Carcinoma",
        "Microcystic Adnexal Carcinoma",
        "NK-Cell Lymphoma, Unclassifiable",
        "Papillary Adenocarcinoma",
        "Porocarcinoma",
        "Primary Cutaneous Mucinous Carcinoma",
        "Recurrent Mature T-Cell and NK-Cell Non-Hodgkin Lymphoma",
        "Recurrent T-Cell Non-Hodgkin Lymphoma",
        "Refractory Anaplastic Large Cell Lymphoma",
        "Refractory Mature T-Cell and NK-Cell Non-Hodgkin Lymphoma",
        "Refractory Merkel Cell Carcinoma",
        "Refractory Mycosis Fungoides",
        "Refractory Primary Cutaneous T-Cell Non-Hodgkin Lymphoma",
        "Refractory Skin Squamous Cell Carcinoma",
        "Refractory T-Cell Non-Hodgkin Lymphoma",
        "Sezary Syndrome",
        "Signet Ring Cell Adenocarcinoma",
        "Skin Adenoid Cystic Carcinoma",
        "Skin Adnexal Carcinoma",
        "Skin Basal Cell Carcinoma",
        "Skin Basosquamous Cell Carcinoma",
        "Skin Keratoacanthoma",
        "Skin Squamous Cell Carcinoma",
        "Squamoid Eccrine Ductal Carcinoma",
        "Squamous Cell Carcinoma of Unknown Primary",
        "Sweat Gland Carcinoma",
        "Trichilemmal Carcinoma",
        "Vulvar Squamous Cell Carcinoma"
      ],
      "interventions": [
        {
          "name": "Biopsy Procedure",
          "type": "PROCEDURE"
        },
        {
          "name": "Biospecimen Collection",
          "type": "PROCEDURE"
        },
        {
          "name": "Computed Tomography",
          "type": "PROCEDURE"
        },
        {
          "name": "Laboratory Biomarker Analysis",
          "type": "OTHER"
        },
        {
          "name": "Nivolumab",
          "type": "BIOLOGICAL"
        },
        {
          "name": "Positron Emission Mammography",
          "type": "PROCEDURE"
        },
        {
          "name": "Talimogene Laherparepvec",
          "type": "BIOLOGICAL"
        }
      ],
      "intervention_types": [
        "PROCEDURE",
        "OTHER",
        "BIOLOGICAL"
      ],
      "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": 68,
      "start_date": "2017-09-27",
      "completion_date": "2027-09-01",
      "has_results": false,
      "last_update_posted_date": "2026-05-13",
      "last_synced_at": "2026-06-26T17:38:38.737Z",
      "location_count": 36,
      "location_summary": "Los Angeles, California • Orange, California • Pasadena, California + 28 more",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Orange",
          "state": "California"
        },
        {
          "city": "Pasadena",
          "state": "California"
        },
        {
          "city": "Sacramento",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02978625"
    },
    {
      "nct_id": "NCT02685631",
      "title": "Yttrium Y 90 Resin Microspheres Data Collection in Unresectable Liver Cancer: the RESIN Study",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Localized Non-Resectable Adult Liver Carcinoma"
      ],
      "interventions": [
        {
          "name": "Yttrium-90 Resin Microspheres",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "Vanderbilt-Ingram Cancer Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 1653,
      "start_date": "2015-07",
      "completion_date": "2021-08-31",
      "has_results": false,
      "last_update_posted_date": "2021-09-05",
      "last_synced_at": "2026-06-26T17:38:38.737Z",
      "location_count": 42,
      "location_summary": "Birmingham, Alabama • Tucson, Arizona • Little Rock, Arkansas + 34 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Tucson",
          "state": "Arizona"
        },
        {
          "city": "Little Rock",
          "state": "Arkansas"
        },
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "San Francisco",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02685631"
    },
    {
      "nct_id": "NCT05245682",
      "title": "Tolinapant and Radiation for Cisplatin-Ineligible, Previously Untreated, Locally Advanced Head and Neck Cancer",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "EARLY_PHASE1"
      ],
      "conditions": [
        "Head and Neck Carcinoma of Unknown Primary",
        "Locally Advanced Head and Neck Squamous Cell Carcinoma",
        "Locally Advanced Hypopharyngeal Squamous Cell Carcinoma",
        "Locally Advanced Laryngeal Squamous Cell Carcinoma",
        "Locally Advanced Nasopharyngeal Squamous Cell Carcinoma",
        "Locally Advanced Oropharyngeal Squamous Cell Carcinoma"
      ],
      "interventions": [
        {
          "name": "Tolinapant",
          "type": "DRUG"
        },
        {
          "name": "Radiation Therapy",
          "type": "RADIATION"
        }
      ],
      "intervention_types": [
        "DRUG",
        "RADIATION"
      ],
      "sponsor": "Emory University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 10,
      "start_date": "2022-02-17",
      "completion_date": "2026-07-21",
      "has_results": true,
      "last_update_posted_date": "2026-01-08",
      "last_synced_at": "2026-06-26T17:38:38.737Z",
      "location_count": 1,
      "location_summary": "Atlanta, Georgia",
      "locations": [
        {
          "city": "Atlanta",
          "state": "Georgia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05245682"
    },
    {
      "nct_id": "NCT00006361",
      "title": "SU5416 in Treating Patients With Advanced or Recurrent Cancer of the Head and Neck",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Carcinoma of Unknown Primary",
        "Head and Neck Cancer",
        "Non-melanomatous Skin Cancer"
      ],
      "interventions": [
        {
          "name": "semaxanib",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Memorial Sloan Kettering Cancer Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": null,
      "start_date": "2000-12",
      "completion_date": null,
      "has_results": false,
      "last_update_posted_date": "2009-12-04",
      "last_synced_at": "2026-06-26T17:38:38.737Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00006361"
    },
    {
      "nct_id": "NCT03323463",
      "title": "Major De-escalation to 30 Gy for Select Human Papillomavirus Associated Oropharyngeal Carcinoma",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "HPV-Associated Oropharyngeal Squamous Cell Carcinoma",
        "Squamous Cell Carcinoma of the Neck"
      ],
      "interventions": [
        {
          "name": "F-FMISO PET/CT Scan",
          "type": "DIAGNOSTIC_TEST"
        },
        {
          "name": "30 Gy over 3 weeks",
          "type": "RADIATION"
        },
        {
          "name": "Cisplatin",
          "type": "DRUG"
        },
        {
          "name": "Carboplatin",
          "type": "DRUG"
        },
        {
          "name": "5Fluorouracil",
          "type": "DRUG"
        },
        {
          "name": "Proton Therapy",
          "type": "RADIATION"
        }
      ],
      "intervention_types": [
        "DIAGNOSTIC_TEST",
        "RADIATION",
        "DRUG"
      ],
      "sponsor": "Memorial Sloan Kettering Cancer Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 316,
      "start_date": "2017-10-16",
      "completion_date": "2026-10-31",
      "has_results": false,
      "last_update_posted_date": "2026-04-13",
      "last_synced_at": "2026-06-26T17:38:38.737Z",
      "location_count": 10,
      "location_summary": "Hartford, Connecticut • Miami, Florida • Basking Ridge, New Jersey + 7 more",
      "locations": [
        {
          "city": "Hartford",
          "state": "Connecticut"
        },
        {
          "city": "Miami",
          "state": "Florida"
        },
        {
          "city": "Basking Ridge",
          "state": "New Jersey"
        },
        {
          "city": "Middletown",
          "state": "New Jersey"
        },
        {
          "city": "Montvale",
          "state": "New Jersey"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03323463"
    },
    {
      "nct_id": "NCT04504604",
      "title": "TCF-001 TRACK (Target Rare Cancer Knowledge) Study",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Rare Cancers",
        "Cholangiocarcinoma",
        "Cancer of Unknown Primary Site"
      ],
      "interventions": [
        {
          "name": "FoundationOne CDx and FoundationOne Liquid CDx",
          "type": "DIAGNOSTIC_TEST"
        }
      ],
      "intervention_types": [
        "DIAGNOSTIC_TEST"
      ],
      "sponsor": "TargetCancer Foundation",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 400,
      "start_date": "2020-10-01",
      "completion_date": "2028-12",
      "has_results": false,
      "last_update_posted_date": "2026-05-26",
      "last_synced_at": "2026-06-26T17:38:38.737Z",
      "location_count": 1,
      "location_summary": "Cambridge, Massachusetts",
      "locations": [
        {
          "city": "Cambridge",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04504604"
    },
    {
      "nct_id": "NCT00047125",
      "title": "Radiation Therapy in Treating Patients With Metastases to the Lymph Nodes in the Neck From an Unknown Primary Tumor",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Carcinoma of Unknown Primary"
      ],
      "interventions": [
        {
          "name": "radiation therapy",
          "type": "RADIATION"
        }
      ],
      "intervention_types": [
        "RADIATION"
      ],
      "sponsor": "European Organisation for Research and Treatment of Cancer - EORTC",
      "sponsor_class": "NETWORK",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "120 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 120 Years · Female only"
      },
      "enrollment_count": 600,
      "start_date": "2002-07",
      "completion_date": null,
      "has_results": false,
      "last_update_posted_date": "2018-07-09",
      "last_synced_at": "2026-06-26T17:38:38.737Z",
      "location_count": 237,
      "location_summary": "Birmingham, Alabama • Huntsville, Alabama • Mobile, Alabama + 180 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Huntsville",
          "state": "Alabama"
        },
        {
          "city": "Mobile",
          "state": "Alabama"
        },
        {
          "city": "Montgomery",
          "state": "Alabama"
        },
        {
          "city": "Tuscaloosa",
          "state": "Alabama"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00047125"
    }
  ]
}