{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Estrogen+therapy",
    "query": {
      "intervention": "Estrogen therapy"
    },
    "page_size": 10
  },
  "pagination": {
    "page": 1,
    "page_size": 10,
    "total_count": 475,
    "total_pages": 48,
    "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Estrogen+therapy&page=2&page_size=10",
    "previous_page_url": null
  },
  "source": "remote",
  "last_synced_at": "2026-09-06T06:56:27.222Z",
  "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": "NCT04174352",
      "title": "FES Imaging to Optimize Tamoxifen for Metastatic Breast Cancer",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "EARLY_PHASE1"
      ],
      "conditions": [
        "ERα+ Breast Cancer",
        "ESR1 Gene Mutation"
      ],
      "interventions": [
        {
          "name": "Tamoxifen",
          "type": "DRUG"
        },
        {
          "name": "FES PET/CT",
          "type": "DIAGNOSTIC_TEST"
        }
      ],
      "intervention_types": [
        "DRUG",
        "DIAGNOSTIC_TEST"
      ],
      "sponsor": "University of Wisconsin, Madison",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "19 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "19 Years and older"
      },
      "enrollment_count": 12,
      "start_date": "2020-10-20",
      "completion_date": "2027-12",
      "has_results": false,
      "last_update_posted_date": "2026-07-21",
      "last_synced_at": "2026-09-06T06:56:27.222Z",
      "location_count": 2,
      "location_summary": "Madison, Wisconsin",
      "locations": [
        {
          "city": "Madison",
          "state": "Wisconsin"
        },
        {
          "city": "Madison",
          "state": "Wisconsin"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04174352"
    },
    {
      "nct_id": "NCT00044876",
      "title": "Treatment of Uterine Fibroids With CDB-2914, an Experimental Selective Progesterone Receptor Antagonist",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Leiomyoma"
      ],
      "interventions": [
        {
          "name": "CDB-2914",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "33 Years",
        "maximum_age": "50 Years",
        "sex": "FEMALE",
        "summary": "33 Years to 50 Years · Female only"
      },
      "enrollment_count": 56,
      "start_date": "2002-09-02",
      "completion_date": "2015-10-01",
      "has_results": false,
      "last_update_posted_date": "2019-12-17",
      "last_synced_at": "2026-09-06T06:56:27.222Z",
      "location_count": 1,
      "location_summary": "Bethesda, Maryland",
      "locations": [
        {
          "city": "Bethesda",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00044876"
    },
    {
      "nct_id": "NCT00154180",
      "title": "Kronos Early Estrogen Prevention Study (KEEPS)",
      "overall_status": "UNKNOWN",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Menopause",
        "Arteriosclerosis"
      ],
      "interventions": [
        {
          "name": "Conjugated equine estrogens 0.45 mg/day",
          "type": "DRUG"
        },
        {
          "name": "Transdermal estradiol, 50 mcg/day",
          "type": "DRUG"
        },
        {
          "name": "Micronized progesterone, 200 mg/day x 12 d/month",
          "type": "DRUG"
        },
        {
          "name": "CEE , progesterone, estradiol patch or placebo for each",
          "type": "DRUG"
        },
        {
          "name": "CEE, progesterone, transdermal patch or the placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Kronos Longevity Research Institute",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "42 Years",
        "maximum_age": "58 Years",
        "sex": "FEMALE",
        "summary": "42 Years to 58 Years · Female only"
      },
      "enrollment_count": 728,
      "start_date": "2005-09",
      "completion_date": "2012-07",
      "has_results": false,
      "last_update_posted_date": "2009-09-14",
      "last_synced_at": "2026-09-06T06:56:27.222Z",
      "location_count": 9,
      "location_summary": "Phoenix, Arizona • San Francisco, California • New Haven, Connecticut + 6 more",
      "locations": [
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "San Francisco",
          "state": "California"
        },
        {
          "city": "New Haven",
          "state": "Connecticut"
        },
        {
          "city": "Boston",
          "state": "Massachusetts"
        },
        {
          "city": "Rochester",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00154180"
    },
    {
      "nct_id": "NCT00229450",
      "title": "Estrogen and Perimenopausal Depression",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Depressive Disorder, Major",
        "Menopause"
      ],
      "interventions": [
        {
          "name": "Estrogen",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of California, Los Angeles",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "40 Years",
        "maximum_age": "60 Years",
        "sex": "FEMALE",
        "summary": "40 Years to 60 Years · Female only"
      },
      "enrollment_count": 17,
      "start_date": "2002-04",
      "completion_date": "2004-08",
      "has_results": false,
      "last_update_posted_date": "2020-02-25",
      "last_synced_at": "2026-09-06T06:56:27.222Z",
      "location_count": 1,
      "location_summary": "Los Angeles, California",
      "locations": [
        {
          "city": "Los Angeles",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00229450"
    },
    {
      "nct_id": "NCT06176261",
      "title": "DATO-BASE: DATOpotamab-deruxtecan for Breast Cancer Brain metAstaSEs",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Breast Cancer",
        "Breast Cancer Female",
        "Metastatic Triple-Negative Breast Carcinoma",
        "ER Positive Breast Cancer",
        "HER2-negative Breast Cancer",
        "HER2 Negative Breast Carcinoma",
        "ER-negative Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Datopotamab Deruxtecan",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Nancy Lin, MD",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 58,
      "start_date": "2024-01-08",
      "completion_date": "2029-01-01",
      "has_results": false,
      "last_update_posted_date": "2026-08-06",
      "last_synced_at": "2026-09-06T06:56:27.222Z",
      "location_count": 3,
      "location_summary": "Miami, Florida • Boston, Massachusetts • Durham, North Carolina",
      "locations": [
        {
          "city": "Miami",
          "state": "Florida"
        },
        {
          "city": "Boston",
          "state": "Massachusetts"
        },
        {
          "city": "Durham",
          "state": "North Carolina"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT06176261"
    },
    {
      "nct_id": "NCT00227942",
      "title": "Estrogen for Treating Depression in Menopausal Women With Hot Flashes and Insomnia",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE4"
      ],
      "conditions": [
        "Sleep Initiation and Maintenance Disorders",
        "Depression"
      ],
      "interventions": [
        {
          "name": "Estrogen Replacement Therapy",
          "type": "DRUG"
        },
        {
          "name": "Zolpidem",
          "type": "DRUG"
        },
        {
          "name": "placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Hadine Joffe, MD",
      "sponsor_class": "OTHER",
      "healthy_volunteers": true,
      "eligibility": {
        "minimum_age": "40 Years",
        "maximum_age": "60 Years",
        "sex": "FEMALE",
        "summary": "40 Years to 60 Years · Female only"
      },
      "enrollment_count": 86,
      "start_date": "2003-08",
      "completion_date": "2007-11",
      "has_results": false,
      "last_update_posted_date": "2014-05-26",
      "last_synced_at": "2026-09-06T06:56:27.222Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00227942"
    },
    {
      "nct_id": "NCT05672901",
      "title": "Silicone Gel vs. Estrogen Vaginal Cream for the Management of Genitourinary Syndrome of Menopause",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "Genitourinary Syndrome of Menopause"
      ],
      "interventions": [
        {
          "name": "StrataMGT",
          "type": "DEVICE"
        },
        {
          "name": "Estrace 0.01% Vaginal Cream",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DEVICE",
        "DRUG"
      ],
      "sponsor": "Stratpharma AG",
      "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": 100,
      "start_date": "2023-04-04",
      "completion_date": "2026-09",
      "has_results": false,
      "last_update_posted_date": "2026-02-20",
      "last_synced_at": "2026-09-06T06:56:27.222Z",
      "location_count": 3,
      "location_summary": "Laguna Hills, California • Miami, Florida • Johns Creek, Georgia",
      "locations": [
        {
          "city": "Laguna Hills",
          "state": "California"
        },
        {
          "city": "Miami",
          "state": "Florida"
        },
        {
          "city": "Johns Creek",
          "state": "Georgia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05672901"
    },
    {
      "nct_id": "NCT07222267",
      "title": "An Investigational Study of BG-75202 Alone and in Combination With Other Therapeutic Agents in Adults With Advanced Solid Tumors",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Breast Cancer",
        "Advanced Solid Tumor"
      ],
      "interventions": [
        {
          "name": "BG-75202",
          "type": "DRUG"
        },
        {
          "name": "CDK4 Inhibitor",
          "type": "DRUG"
        },
        {
          "name": "Estrogen Receptor Antagonist",
          "type": "DRUG"
        },
        {
          "name": "Aromatase Inhibitor",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "BeOne Medicines",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 86,
      "start_date": "2025-12-11",
      "completion_date": "2037-01-13",
      "has_results": false,
      "last_update_posted_date": "2026-08-14",
      "last_synced_at": "2026-09-06T06:56:27.222Z",
      "location_count": 6,
      "location_summary": "Birmingham, Alabama • New Haven, Connecticut • St Louis, Missouri + 3 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "New Haven",
          "state": "Connecticut"
        },
        {
          "city": "St Louis",
          "state": "Missouri"
        },
        {
          "city": "Austin",
          "state": "Texas"
        },
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07222267"
    },
    {
      "nct_id": "NCT01598298",
      "title": "S1202: Duloxetine Hydrochloride for Muscle/Joint Pain in Early-Stage Breast Cancer Receiving Hormone Therapy",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Breast Cancer",
        "Musculoskeletal Complications",
        "Pain"
      ],
      "interventions": [
        {
          "name": "duloxetine hydrochloride",
          "type": "DRUG"
        },
        {
          "name": "placebo",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "SWOG Cancer Research Network",
      "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": 299,
      "start_date": "2013-05-15",
      "completion_date": "2018-12-20",
      "has_results": true,
      "last_update_posted_date": "2022-12-16",
      "last_synced_at": "2026-09-06T06:56:27.222Z",
      "location_count": 714,
      "location_summary": "Anchorage, Alaska • Fairbanks, Alaska • Jonesboro, Arkansas + 475 more",
      "locations": [
        {
          "city": "Anchorage",
          "state": "Alaska"
        },
        {
          "city": "Anchorage",
          "state": "Alaska"
        },
        {
          "city": "Anchorage",
          "state": "Alaska"
        },
        {
          "city": "Anchorage",
          "state": "Alaska"
        },
        {
          "city": "Fairbanks",
          "state": "Alaska"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01598298"
    },
    {
      "nct_id": "NCT01740427",
      "title": "A Study of Palbociclib (PD-0332991) + Letrozole vs. Letrozole For 1st Line Treatment Of Postmenopausal Women With ER+/HER2- Advanced Breast Cancer (PALOMA-2)",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Breast Neoplasms"
      ],
      "interventions": [
        {
          "name": "PD-0332991",
          "type": "DRUG"
        },
        {
          "name": "Letrozole",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Pfizer",
      "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": 666,
      "start_date": "2013-02-22",
      "completion_date": "2023-11-09",
      "has_results": true,
      "last_update_posted_date": "2024-11-14",
      "last_synced_at": "2026-09-06T06:56:27.222Z",
      "location_count": 136,
      "location_summary": "Bellflower, California • Beverly Hills, California • Fullerton, California + 83 more",
      "locations": [
        {
          "city": "Bellflower",
          "state": "California"
        },
        {
          "city": "Beverly Hills",
          "state": "California"
        },
        {
          "city": "Fullerton",
          "state": "California"
        },
        {
          "city": "Glendale",
          "state": "California"
        },
        {
          "city": "Irvine",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01740427"
    }
  ]
}