{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=Estrogen+Receptor+Antagonist&page=2",
    "query": {
      "condition": "Estrogen Receptor Antagonist",
      "page": 2
    },
    "page_size": 10
  },
  "pagination": {
    "page": 2,
    "page_size": 10,
    "total_count": 10,
    "total_pages": 1,
    "next_page_url": null,
    "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=Estrogen+Receptor+Antagonist&page=1&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-07-24T13:30:47.563Z",
  "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": "NCT00728949",
      "title": "A Study for Safety and Effectiveness of IMC-A12 by Itself or Combined With Antiestrogens to Treat Breast Cancer",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Metastatic Breast Cancer"
      ],
      "interventions": [
        {
          "name": "IMC-A12 (cixutumumab)",
          "type": "BIOLOGICAL"
        },
        {
          "name": "tamoxifen",
          "type": "DRUG"
        },
        {
          "name": "Anastrozole",
          "type": "DRUG"
        },
        {
          "name": "Letrozole",
          "type": "DRUG"
        },
        {
          "name": "Exemestane",
          "type": "DRUG"
        },
        {
          "name": "Fulvestrant",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "BIOLOGICAL",
        "DRUG"
      ],
      "sponsor": "Eli Lilly and Company",
      "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": 93,
      "start_date": "2008-08",
      "completion_date": "2015-02",
      "has_results": true,
      "last_update_posted_date": "2018-06-06",
      "last_synced_at": "2026-07-24T13:30:47.563Z",
      "location_count": 9,
      "location_summary": "Scottsdale, Arizona • Chicago, Illinois • Westwood, Kansas + 6 more",
      "locations": [
        {
          "city": "Scottsdale",
          "state": "Arizona"
        },
        {
          "city": "Chicago",
          "state": "Illinois"
        },
        {
          "city": "Westwood",
          "state": "Kansas"
        },
        {
          "city": "Rochester",
          "state": "Minnesota"
        },
        {
          "city": "Lebanon",
          "state": "New Hampshire"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00728949"
    },
    {
      "nct_id": "NCT07647328",
      "title": "A Phase IIIb Study to Evaluate Camizestrant Plus Ribociclib in ER-positive, HER2-negative Advanced Breast Cancer",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "ER-Positive HER2-Negative Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Camizestrant",
          "type": "DRUG"
        },
        {
          "name": "Ribociclib",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "AstraZeneca",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "130 Years",
        "sex": "ALL",
        "summary": "18 Years to 130 Years"
      },
      "enrollment_count": 150,
      "start_date": "2026-06-15",
      "completion_date": "2029-02-28",
      "has_results": false,
      "last_update_posted_date": "2026-07-10",
      "last_synced_at": "2026-07-24T13:30:47.563Z",
      "location_count": 12,
      "location_summary": "Duarte, California • Palo Alto, California • Marietta, Georgia + 9 more",
      "locations": [
        {
          "city": "Duarte",
          "state": "California"
        },
        {
          "city": "Palo Alto",
          "state": "California"
        },
        {
          "city": "Marietta",
          "state": "Georgia"
        },
        {
          "city": "Evanston",
          "state": "Illinois"
        },
        {
          "city": "Edgewood",
          "state": "Kentucky"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07647328"
    },
    {
      "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": "2026-07-24T13:30:47.563Z",
      "location_count": 1,
      "location_summary": "Bethesda, Maryland",
      "locations": [
        {
          "city": "Bethesda",
          "state": "Maryland"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00044876"
    },
    {
      "nct_id": "NCT00020735",
      "title": "Toremifene Followed by Radical Prostatectomy in Treating Patients With Stage I or Stage II Prostate Cancer",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Prostate Cancer"
      ],
      "interventions": [
        {
          "name": "toremifene",
          "type": "DRUG"
        },
        {
          "name": "conventional surgery",
          "type": "PROCEDURE"
        },
        {
          "name": "neoadjuvant therapy",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "DRUG",
        "PROCEDURE"
      ],
      "sponsor": "Joel Nelson, MD",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "120 Years",
        "sex": "MALE",
        "summary": "18 Years to 120 Years · Male only"
      },
      "enrollment_count": 45,
      "start_date": "2001-04",
      "completion_date": "2009-06",
      "has_results": false,
      "last_update_posted_date": "2015-12-02",
      "last_synced_at": "2026-07-24T13:30:47.563Z",
      "location_count": 1,
      "location_summary": "Pittsburgh, Pennsylvania",
      "locations": [
        {
          "city": "Pittsburgh",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00020735"
    },
    {
      "nct_id": "NCT07085767",
      "title": "Palazestrant in Combination With Ribociclib for the First-line Treatment of ER+/HER2- Advanced Breast Cancer",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Breast Cancer",
        "Locally Advanced Breast Cancer",
        "Metastatic Breast Cancer",
        "ER Positive Breast Cancer",
        "HER2 Negative Breast Carcinoma"
      ],
      "interventions": [
        {
          "name": "Palazestrant",
          "type": "DRUG"
        },
        {
          "name": "Letrozole-matching placebo",
          "type": "DRUG"
        },
        {
          "name": "Ribociclib",
          "type": "DRUG"
        },
        {
          "name": "Letrozole",
          "type": "DRUG"
        },
        {
          "name": "Palazestrant matching-placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Olema 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": 1000,
      "start_date": "2025-11-03",
      "completion_date": "2032-01",
      "has_results": false,
      "last_update_posted_date": "2026-07-17",
      "last_synced_at": "2026-07-24T13:30:47.563Z",
      "location_count": 43,
      "location_summary": "Hot Springs, Arkansas • Beverly Hills, California • La Jolla, California + 40 more",
      "locations": [
        {
          "city": "Hot Springs",
          "state": "Arkansas"
        },
        {
          "city": "Beverly Hills",
          "state": "California"
        },
        {
          "city": "La Jolla",
          "state": "California"
        },
        {
          "city": "Los Alamitos",
          "state": "California"
        },
        {
          "city": "San Francisco",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07085767"
    },
    {
      "nct_id": "NCT00005886",
      "title": "Tamoxifen Compared With LY353381 in Treating Women With Newly Diagnosed Breast Cancer",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Breast Cancer"
      ],
      "interventions": [
        {
          "name": "arzoxifene hydrochloride",
          "type": "DRUG"
        },
        {
          "name": "tamoxifen citrate",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "University of Kansas Medical Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": "120 Years",
        "sex": "FEMALE",
        "summary": "18 Years to 120 Years · Female only"
      },
      "enrollment_count": null,
      "start_date": "2000-07",
      "completion_date": "2002-08",
      "has_results": false,
      "last_update_posted_date": "2017-01-13",
      "last_synced_at": "2026-07-24T13:30:47.563Z",
      "location_count": 9,
      "location_summary": "Birmingham, Alabama • Los Angeles, California • Palm Springs, California + 6 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Palm Springs",
          "state": "California"
        },
        {
          "city": "Maywood",
          "state": "Illinois"
        },
        {
          "city": "Kansas City",
          "state": "Kansas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00005886"
    },
    {
      "nct_id": "NCT00267553",
      "title": "Treatment and Survival Continuation Study of Atamestane Plus Toremifene vs Letrozole in Advanced Breast Cancer",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Breast Neoplasms",
        "Neoplasms, Hormone-Dependent"
      ],
      "interventions": [
        {
          "name": "Atamestane",
          "type": "DRUG"
        },
        {
          "name": "toremifene",
          "type": "DRUG"
        },
        {
          "name": "letrozole",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Intarcia Therapeutics",
      "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": 200,
      "start_date": "2005-11",
      "completion_date": "2006-06",
      "has_results": false,
      "last_update_posted_date": "2007-09-10",
      "last_synced_at": "2026-07-24T13:30:47.563Z",
      "location_count": 6,
      "location_summary": "Greenbrae, California • Saint Joseph, Michigan • Kansas City, Missouri + 3 more",
      "locations": [
        {
          "city": "Greenbrae",
          "state": "California"
        },
        {
          "city": "Saint Joseph",
          "state": "Michigan"
        },
        {
          "city": "Kansas City",
          "state": "Missouri"
        },
        {
          "city": "Houston",
          "state": "Texas"
        },
        {
          "city": "Norfolk",
          "state": "Virginia"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00267553"
    },
    {
      "nct_id": "NCT00097344",
      "title": "The CAT Study: Atamestane Plus Toremifene Versus Letrozole in Advanced Breast Cancer",
      "overall_status": "TERMINATED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Breast Neoplasms",
        "Neoplasms, Hormone-Dependent"
      ],
      "interventions": [
        {
          "name": "Atamestane",
          "type": "DRUG"
        },
        {
          "name": "Toremifene",
          "type": "DRUG"
        },
        {
          "name": "Letrozole",
          "type": "DRUG"
        },
        {
          "name": "Aromatase inhibition",
          "type": "DRUG"
        },
        {
          "name": "Estrogen receptor blocker",
          "type": "DRUG"
        },
        {
          "name": "Hormone therapy",
          "type": "PROCEDURE"
        },
        {
          "name": "Endocrine therapy",
          "type": "PROCEDURE"
        },
        {
          "name": "Antiestrogen therapy",
          "type": "PROCEDURE"
        }
      ],
      "intervention_types": [
        "DRUG",
        "PROCEDURE"
      ],
      "sponsor": "Intarcia Therapeutics",
      "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": 842,
      "start_date": "2004-12",
      "completion_date": "2006-08",
      "has_results": false,
      "last_update_posted_date": "2007-08-23",
      "last_synced_at": "2026-07-24T13:30:47.563Z",
      "location_count": 49,
      "location_summary": "Mobile, Alabama • Tuscon, Arizona • Hot Springs, Arkansas + 46 more",
      "locations": [
        {
          "city": "Mobile",
          "state": "Alabama"
        },
        {
          "city": "Tuscon",
          "state": "Arizona"
        },
        {
          "city": "Hot Springs",
          "state": "Arkansas"
        },
        {
          "city": "Fountain Valley",
          "state": "California"
        },
        {
          "city": "Greenbrae",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00097344"
    },
    {
      "nct_id": "NCT02422615",
      "title": "Study of Efficacy and Safety of LEE011 in Men and Postmenopausal Women With Advanced Breast Cancer.",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Advanced Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Ribociclib",
          "type": "DRUG"
        },
        {
          "name": "Fulvestrant",
          "type": "DRUG"
        },
        {
          "name": "Placebo",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Novartis Pharmaceuticals",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 726,
      "start_date": "2015-06-09",
      "completion_date": "2023-01-11",
      "has_results": true,
      "last_update_posted_date": "2023-11-30",
      "last_synced_at": "2026-07-24T13:30:47.563Z",
      "location_count": 26,
      "location_summary": "Mobile, Alabama • Chandler, Arizona • Fayetteville, Arkansas + 22 more",
      "locations": [
        {
          "city": "Mobile",
          "state": "Alabama"
        },
        {
          "city": "Chandler",
          "state": "Arizona"
        },
        {
          "city": "Fayetteville",
          "state": "Arkansas"
        },
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Santa Maria",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02422615"
    },
    {
      "nct_id": "NCT00002864",
      "title": "Tamoxifen With or Without Octreotide in Treating Postmenopausal Women With Stage I, Stage II, or Stage III Breast Cancer",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Breast Cancer"
      ],
      "interventions": [
        {
          "name": "octreotide acetate",
          "type": "DRUG"
        },
        {
          "name": "tamoxifen citrate",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "NCIC Clinical Trials Group",
      "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": 667,
      "start_date": "1996-09-24",
      "completion_date": "2010-04-23",
      "has_results": false,
      "last_update_posted_date": "2020-04-01",
      "last_synced_at": "2026-07-24T13:30:47.563Z",
      "location_count": 2,
      "location_summary": "Duluth, Minnesota",
      "locations": [
        {
          "city": "Duluth",
          "state": "Minnesota"
        },
        {
          "city": "Duluth",
          "state": "Minnesota"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00002864"
    }
  ]
}