{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Tamoxifen+20mg",
    "query": {
      "intervention": "Tamoxifen 20mg"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 26,
    "total_pages": 3,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Tamoxifen+20mg&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-24T12:13:23.983Z",
  "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": "NCT03870399",
      "title": "Study of Tamoxifen in Well Differentiated Neuroendocrine Tumors and Hormone Receptor Positive Expression",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Neuroendocrine Tumors",
        "Progesterone Receptor Positive Tumor",
        "Estrogen Receptor Positive Tumor"
      ],
      "interventions": [
        {
          "name": "Tamoxifen",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "AC Camargo 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": 23,
      "start_date": "2019-03-13",
      "completion_date": "2023-05-13",
      "has_results": false,
      "last_update_posted_date": "2024-05-06",
      "last_synced_at": "2026-09-24T12:13:23.983Z",
      "location_count": 1,
      "location_summary": "Tampa, Florida",
      "locations": [
        {
          "city": "Tampa",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03870399"
    },
    {
      "nct_id": "NCT07071038",
      "title": "Evaluating the Use of a Medication 'Switch' vs Guideline-directed Interventions for Relieving Side Effects of Aromatase Inhibitors Among Breast Cancer Patients",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Breast Cancer",
        "Adjuvant Treatment",
        "Early Stage Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Switch",
          "type": "DRUG"
        },
        {
          "name": "Guideline Directed Intervention (GDI)",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "Dartmouth-Hitchcock 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": 62,
      "start_date": "2025-10-17",
      "completion_date": "2027-08-05",
      "has_results": false,
      "last_update_posted_date": "2026-02-12",
      "last_synced_at": "2026-09-24T12:13:23.983Z",
      "location_count": 1,
      "location_summary": "Lebanon, New Hampshire",
      "locations": [
        {
          "city": "Lebanon",
          "state": "New Hampshire"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07071038"
    },
    {
      "nct_id": "NCT00106691",
      "title": "Prostate Cancer Prevention Study for Men With High Grade PIN (Prostatic Intraepithelial Neoplasia)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Preneoplastic Conditions",
        "Prostatic Intraepithelial Neoplasia"
      ],
      "interventions": [
        {
          "name": "Toremifene 20 mg",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "GTx",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "30 Years",
        "maximum_age": null,
        "sex": "MALE",
        "summary": "30 Years and older · Male only"
      },
      "enrollment_count": 1589,
      "start_date": "2005-01",
      "completion_date": "2010-02",
      "has_results": true,
      "last_update_posted_date": "2023-06-12",
      "last_synced_at": "2026-09-24T12:13:23.983Z",
      "location_count": 108,
      "location_summary": "Huntsville, Alabama • Mobile, Alabama • Phoenix, Arizona + 93 more",
      "locations": [
        {
          "city": "Huntsville",
          "state": "Alabama"
        },
        {
          "city": "Mobile",
          "state": "Alabama"
        },
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Little Rock",
          "state": "Arkansas"
        },
        {
          "city": "San Bernardino",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00106691"
    },
    {
      "nct_id": "NCT00066703",
      "title": "Triptorelin With Either Exemestane or Tamoxifen in Treating Premenopausal Women With Hormone-Responsive Breast Cancer",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Breast Cancer"
      ],
      "interventions": [
        {
          "name": "exemestane",
          "type": "DRUG"
        },
        {
          "name": "tamoxifen",
          "type": "DRUG"
        },
        {
          "name": "triptorelin",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "ETOP IBCSG Partners Foundation",
      "sponsor_class": "NETWORK",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "65 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 65 Years · Female only"
      },
      "enrollment_count": 2672,
      "start_date": "2003-11-03",
      "completion_date": "2024-10-23",
      "has_results": true,
      "last_update_posted_date": "2026-02-06",
      "last_synced_at": "2026-09-24T12:13:23.983Z",
      "location_count": 139,
      "location_summary": "Burbank, California • La Jolla, California • Mission Hills, California + 106 more",
      "locations": [
        {
          "city": "Burbank",
          "state": "California"
        },
        {
          "city": "La Jolla",
          "state": "California"
        },
        {
          "city": "Mission Hills",
          "state": "California"
        },
        {
          "city": "Palm Springs",
          "state": "California"
        },
        {
          "city": "Roseville",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00066703"
    },
    {
      "nct_id": "NCT00952731",
      "title": "4-Hydroxytamoxifen or Tamoxifen Citrate in Treating Women With Newly Diagnosed Ductal Breast Carcinoma in Situ",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Ductal Breast Carcinoma in Situ",
        "Estrogen Receptor-positive Breast Cancer"
      ],
      "interventions": [
        {
          "name": "oral placebo",
          "type": "DRUG"
        },
        {
          "name": "afimoxifene",
          "type": "DRUG"
        },
        {
          "name": "tamoxifen citrate",
          "type": "DRUG"
        },
        {
          "name": "placebo gel",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Northwestern University",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "18 Years and older · Female only"
      },
      "enrollment_count": 27,
      "start_date": "2009-12",
      "completion_date": null,
      "has_results": true,
      "last_update_posted_date": "2015-07-21",
      "last_synced_at": "2026-09-24T12:13:23.983Z",
      "location_count": 1,
      "location_summary": "Chicago, Illinois",
      "locations": [
        {
          "city": "Chicago",
          "state": "Illinois"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00952731"
    },
    {
      "nct_id": "NCT02384239",
      "title": "A Study of Palbociclib in Combination With Fulvestrant or Tamoxifen as Treatment for Metastatic Breast Cancer",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Metastatic Breast Cancer",
        "Hormone Receptor Positive"
      ],
      "interventions": [
        {
          "name": "Palbociclib",
          "type": "DRUG"
        },
        {
          "name": "Tamoxifen",
          "type": "DRUG"
        },
        {
          "name": "Fulvestrant",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of California, San Francisco",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 70,
      "start_date": "2015-10-19",
      "completion_date": "2021-01-31",
      "has_results": true,
      "last_update_posted_date": "2022-03-16",
      "last_synced_at": "2026-09-24T12:13:23.983Z",
      "location_count": 9,
      "location_summary": "San Francisco, California • Washington D.C., District of Columbia • Chicago, Illinois + 6 more",
      "locations": [
        {
          "city": "San Francisco",
          "state": "California"
        },
        {
          "city": "Washington D.C.",
          "state": "District of Columbia"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        },
        {
          "city": "Indianapolis",
          "state": "Indiana"
        },
        {
          "city": "Baltimore",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02384239"
    },
    {
      "nct_id": "NCT00228930",
      "title": "Tamoxifen Pharmacogenetics and Clinical Effects",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Tamoxifen (pharmacodynamic analysis)",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "National Institute of General Medical Sciences (NIGMS)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "70 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 70 Years · Female only"
      },
      "enrollment_count": 297,
      "start_date": "2002-09",
      "completion_date": "2007-08",
      "has_results": false,
      "last_update_posted_date": "2008-09-25",
      "last_synced_at": "2026-09-24T12:13:23.983Z",
      "location_count": 2,
      "location_summary": "Indianapolis, Indiana • Ann Arbor, Michigan",
      "locations": [
        {
          "city": "Indianapolis",
          "state": "Indiana"
        },
        {
          "city": "Ann Arbor",
          "state": "Michigan"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00228930"
    },
    {
      "nct_id": "NCT02936206",
      "title": "Examination of Breast Cancer Cells of Pre-menopausal and Post-menopausal Women Before and After Exposure to Tamoxifen or Fulvestrant.",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Fulvestrant",
          "type": "DRUG"
        },
        {
          "name": "Tamoxifen",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Icahn School of Medicine at Mount Sinai",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "18 Years and older · Female only"
      },
      "enrollment_count": 2,
      "start_date": "2016-10",
      "completion_date": "2020-05-01",
      "has_results": true,
      "last_update_posted_date": "2021-05-19",
      "last_synced_at": "2026-09-24T12:13:23.983Z",
      "location_count": 3,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        },
        {
          "city": "New York",
          "state": "New York"
        },
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02936206"
    },
    {
      "nct_id": "NCT00900744",
      "title": "A Pilot Study of Varying Doses of Tamoxifen in the Setting of Genetic Polymorphisms of CYP2D6",
      "overall_status": "COMPLETED",
      "study_type": "OBSERVATIONAL",
      "phases": [],
      "conditions": [
        "Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Tamoxifen",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "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": 121,
      "start_date": "2009-01",
      "completion_date": "2012-01",
      "has_results": false,
      "last_update_posted_date": "2017-08-25",
      "last_synced_at": "2026-09-24T12:13:23.983Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00900744"
    },
    {
      "nct_id": "NCT00659373",
      "title": "Brain Function in Premenopausal Women Receiving Tamoxifen With or Without Ovarian Function Suppression for Early-Stage Breast Cancer on Clinical Trial IBCSG 24-02",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Breast Cancer",
        "Fatigue",
        "Sleep Disorders"
      ],
      "interventions": [
        {
          "name": "Tamoxifen",
          "type": "DRUG"
        },
        {
          "name": "triptorelin",
          "type": "DRUG"
        },
        {
          "name": "Exemestane",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "ETOP IBCSG Partners Foundation",
      "sponsor_class": "NETWORK",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": null,
        "maximum_age": "120 Years",
        "sex": "FEMALE",
        "summary": "Up to 120 Years · Female only"
      },
      "enrollment_count": 86,
      "start_date": "2007-12",
      "completion_date": "2016-04",
      "has_results": true,
      "last_update_posted_date": "2016-07-25",
      "last_synced_at": "2026-09-24T12:13:23.983Z",
      "location_count": 13,
      "location_summary": "Sacramento, California • Fort Collins, Colorado • Norwalk, Connecticut + 7 more",
      "locations": [
        {
          "city": "Sacramento",
          "state": "California"
        },
        {
          "city": "Fort Collins",
          "state": "Colorado"
        },
        {
          "city": "Norwalk",
          "state": "Connecticut"
        },
        {
          "city": "Atlanta",
          "state": "Georgia"
        },
        {
          "city": "Atlanta",
          "state": "Georgia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00659373"
    }
  ]
}