{
  "api_version": "1",
  "request": {
    "url": "https://clinicaltrialsfind.com/api/v1/search.json?condition=ESR1+Gene+Mutation&page=2",
    "query": {
      "condition": "ESR1 Gene Mutation",
      "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=ESR1+Gene+Mutation&page=1&page_size=10"
  },
  "source": "remote",
  "last_synced_at": "2026-07-24T00:22:02.207Z",
  "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": "NCT01219699",
      "title": "A Study of BYL719 in Adult Patients With Advanced Solid Malignancies, Whose Tumors Have an Alteration of the PIK3CA Gene",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Advanced Solid Tumors With an Alteration of the PIK3CA Gene",
        "Estrogen Receptor Positive Breast Cancer"
      ],
      "interventions": [
        {
          "name": "BYL719",
          "type": "DRUG"
        },
        {
          "name": "Fulvestrant",
          "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": 221,
      "start_date": "2010-10-05",
      "completion_date": "2020-04-16",
      "has_results": false,
      "last_update_posted_date": "2020-09-22",
      "last_synced_at": "2026-07-24T00:22:02.207Z",
      "location_count": 5,
      "location_summary": "San Francisco, California • Boston, Massachusetts • Nashville, Tennessee + 1 more",
      "locations": [
        {
          "city": "San Francisco",
          "state": "California"
        },
        {
          "city": "Boston",
          "state": "Massachusetts"
        },
        {
          "city": "Nashville",
          "state": "Tennessee"
        },
        {
          "city": "Nashville",
          "state": "Tennessee"
        },
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT01219699"
    },
    {
      "nct_id": "NCT04432454",
      "title": "Evaluation of Lasofoxifene Combined With Abemaciclib in Advanced or Metastatic ER+/HER2- Breast Cancer With an ESR1 Mutation",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Metastatic Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Lasofoxifene and abemaciclib (VERZENIO (R)).",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Sermonix Pharmaceuticals Inc.",
      "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": 29,
      "start_date": "2020-09-29",
      "completion_date": "2025-01-28",
      "has_results": false,
      "last_update_posted_date": "2025-02-13",
      "last_synced_at": "2026-07-24T00:22:02.207Z",
      "location_count": 16,
      "location_summary": "Birmingham, Alabama • Yuma, Arizona • Fountain Valley, California + 12 more",
      "locations": [
        {
          "city": "Birmingham",
          "state": "Alabama"
        },
        {
          "city": "Yuma",
          "state": "Arizona"
        },
        {
          "city": "Fountain Valley",
          "state": "California"
        },
        {
          "city": "Santa Rosa",
          "state": "California"
        },
        {
          "city": "Jacksonville",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT04432454"
    },
    {
      "nct_id": "NCT02913430",
      "title": "Treatment of Metastatic Breast Cancer With Fulvestrant Plus Palbociclib or Tamoxifen Plus Palbociclib",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "EARLY_PHASE1"
      ],
      "conditions": [
        "Metastatic Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Fulvestrant",
          "type": "DRUG"
        },
        {
          "name": "Tamoxifen",
          "type": "DRUG"
        },
        {
          "name": "Palbociclib",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Shannon Puhalla",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 7,
      "start_date": "2018-04-24",
      "completion_date": "2024-04-30",
      "has_results": true,
      "last_update_posted_date": "2024-09-23",
      "last_synced_at": "2026-07-24T00:22:02.207Z",
      "location_count": 1,
      "location_summary": "Pittsburgh, Pennsylvania",
      "locations": [
        {
          "city": "Pittsburgh",
          "state": "Pennsylvania"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02913430"
    },
    {
      "nct_id": "NCT07222215",
      "title": "PhII Randomized CAPecitabine + ELAcestrant vs. Capecitabine Alone in ER+ Breast Cancer (CAPELA)",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Estrogen-receptor-positive Breast Cancer",
        "Metastatic Breast Cancer",
        "Breast Cancer",
        "Hormone Receptor Positive Breast Cancer",
        "Human Epidermal Growth Factor 2 Negative Carcinoma of Breast",
        "HER2- Breast Cancer",
        "ESR1 Gene Mutation",
        "ER Wildtype",
        "Breast Neoplasms"
      ],
      "interventions": [
        {
          "name": "Capecitabine",
          "type": "DRUG"
        },
        {
          "name": "Elacestrant",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Kristina A. Fanucci",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 297,
      "start_date": "2026-01-16",
      "completion_date": "2030-10-01",
      "has_results": false,
      "last_update_posted_date": "2026-06-12",
      "last_synced_at": "2026-07-24T00:22:02.207Z",
      "location_count": 1,
      "location_summary": "Boston, Massachusetts",
      "locations": [
        {
          "city": "Boston",
          "state": "Massachusetts"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07222215"
    },
    {
      "nct_id": "NCT02208375",
      "title": "mTORC1/2 Inhibitor AZD2014 or the Oral AKT Inhibitor AZD5363 for Recurrent Endometrial and Ovarian",
      "overall_status": "ACTIVE_NOT_RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "BRCA1 Mutation Carrier",
        "BRCA2 Mutation Carrier",
        "Endometrial Adenocarcinoma",
        "Estrogen Receptor Negative",
        "HER2/Neu Negative",
        "High Grade Ovarian Serous Adenocarcinoma",
        "Progesterone Receptor Negative",
        "Recurrent Breast Carcinoma",
        "Recurrent Fallopian Tube Carcinoma",
        "Recurrent Ovarian Carcinoma",
        "Recurrent Primary Peritoneal Carcinoma",
        "Recurrent Uterine Corpus Carcinoma",
        "Stage III Uterine Corpus Cancer AJCC v7",
        "Stage IV Breast Cancer AJCC v6 and v7",
        "Stage IV Uterine Corpus Cancer AJCC v7",
        "Triple-Negative Breast Carcinoma"
      ],
      "interventions": [
        {
          "name": "Capivasertib",
          "type": "DRUG"
        },
        {
          "name": "Laboratory Biomarker Analysis",
          "type": "OTHER"
        },
        {
          "name": "Olaparib",
          "type": "DRUG"
        },
        {
          "name": "Pharmacological Study",
          "type": "OTHER"
        },
        {
          "name": "Vistusertib",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG",
        "OTHER"
      ],
      "sponsor": "M.D. Anderson Cancer Center",
      "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": 159,
      "start_date": "2014-11-11",
      "completion_date": "2028-06-30",
      "has_results": false,
      "last_update_posted_date": "2026-06-15",
      "last_synced_at": "2026-07-24T00:22:02.207Z",
      "location_count": 1,
      "location_summary": "Houston, Texas",
      "locations": [
        {
          "city": "Houston",
          "state": "Texas"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02208375"
    },
    {
      "nct_id": "NCT00892736",
      "title": "Veliparib in Treating Patients With Malignant Solid Tumors That Do Not Respond to Previous Therapy",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1"
      ],
      "conditions": [
        "Basal-Like Breast Carcinoma",
        "BRCA1 Mutation Carrier",
        "BRCA2 Mutation Carrier",
        "Breast Carcinoma",
        "Estrogen Receptor Negative",
        "HER2/Neu Negative",
        "Hereditary Breast and Ovarian Cancer Syndrome",
        "Ovarian Carcinoma",
        "Pancreatic Carcinoma",
        "Progesterone Receptor Negative",
        "Prostate Carcinoma",
        "Recurrent Breast Carcinoma",
        "Recurrent Fallopian Tube Carcinoma",
        "Recurrent Ovarian Carcinoma",
        "Recurrent Primary Peritoneal Carcinoma",
        "Solid Neoplasm",
        "Triple-Negative Breast Carcinoma"
      ],
      "interventions": [
        {
          "name": "Laboratory Biomarker Analysis",
          "type": "OTHER"
        },
        {
          "name": "Pharmacological Study",
          "type": "OTHER"
        },
        {
          "name": "Veliparib",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "OTHER",
        "DRUG"
      ],
      "sponsor": "National Cancer Institute (NCI)",
      "sponsor_class": "NIH",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "19 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "19 Years and older"
      },
      "enrollment_count": 98,
      "start_date": "2009-04-20",
      "completion_date": "2017-05-19",
      "has_results": false,
      "last_update_posted_date": "2018-06-29",
      "last_synced_at": "2026-07-24T00:22:02.207Z",
      "location_count": 7,
      "location_summary": "Duarte, California • Los Angeles, California • Sacramento, California + 4 more",
      "locations": [
        {
          "city": "Duarte",
          "state": "California"
        },
        {
          "city": "Los Angeles",
          "state": "California"
        },
        {
          "city": "Sacramento",
          "state": "California"
        },
        {
          "city": "South Pasadena",
          "state": "California"
        },
        {
          "city": "New Brunswick",
          "state": "New Jersey"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT00892736"
    },
    {
      "nct_id": "NCT05696626",
      "title": "Evaluation of Lasofoxifene Combined With Abemaciclib Compared With Fulvestrant Combined With Abemaciclib in Locally Advanced or Metastatic ER+/HER2- Breast Cancer With an ESR1 Mutation",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE3"
      ],
      "conditions": [
        "Metastatic Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Lasofoxifene in combination with abemaciclib",
          "type": "DRUG"
        },
        {
          "name": "Fulvestrant in combination with abemaciclib",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "LeonaBio",
      "sponsor_class": "INDUSTRY",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "18 Years",
        "maximum_age": null,
        "sex": "ALL",
        "summary": "18 Years and older"
      },
      "enrollment_count": 600,
      "start_date": "2023-10-31",
      "completion_date": "2028-04",
      "has_results": false,
      "last_update_posted_date": "2026-06-22",
      "last_synced_at": "2026-07-24T00:22:02.207Z",
      "location_count": 36,
      "location_summary": "Scottsdale, Arizona • Tucson, Arizona • Santa Rosa, California + 25 more",
      "locations": [
        {
          "city": "Scottsdale",
          "state": "Arizona"
        },
        {
          "city": "Tucson",
          "state": "Arizona"
        },
        {
          "city": "Santa Rosa",
          "state": "California"
        },
        {
          "city": "Jacksonville",
          "state": "Florida"
        },
        {
          "city": "Miami",
          "state": "Florida"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT05696626"
    },
    {
      "nct_id": "NCT02993068",
      "title": "Stand up to Cancer: MAGENTA (Making Genetic Testing Accessible)",
      "overall_status": "SUSPENDED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "NA"
      ],
      "conditions": [
        "BARD1 Gene Mutation",
        "BRCA1 Gene Mutation",
        "BRCA2 Gene Mutation",
        "BRIP1 Gene Mutation",
        "Estrogen Receptor Negative",
        "HER2/Neu Negative",
        "MLH1 Gene Mutation",
        "MSH2 Gene Mutation",
        "MSH6 Gene Mutation",
        "PALB2 Gene Mutation",
        "PMS2 Gene Mutation",
        "Progesterone Receptor Negative",
        "RAD51C Gene Mutation",
        "RAD51D Gene Mutation",
        "Triple-Negative Breast Carcinoma"
      ],
      "interventions": [
        {
          "name": "Educational Intervention",
          "type": "OTHER"
        },
        {
          "name": "Genetic Counseling",
          "type": "OTHER"
        },
        {
          "name": "Laboratory Biomarker Analysis",
          "type": "OTHER"
        },
        {
          "name": "Questionnaire Administration",
          "type": "OTHER"
        }
      ],
      "intervention_types": [
        "OTHER"
      ],
      "sponsor": "M.D. Anderson Cancer Center",
      "sponsor_class": "OTHER",
      "healthy_volunteers": false,
      "eligibility": {
        "minimum_age": "30 Years",
        "maximum_age": null,
        "sex": "FEMALE",
        "summary": "30 Years and older · Female only"
      },
      "enrollment_count": 5200,
      "start_date": "2017-04-18",
      "completion_date": "2026-04-18",
      "has_results": false,
      "last_update_posted_date": "2026-02-19",
      "last_synced_at": "2026-07-24T00:22:02.207Z",
      "location_count": 2,
      "location_summary": "Houston, Texas • Seattle, Washington",
      "locations": [
        {
          "city": "Houston",
          "state": "Texas"
        },
        {
          "city": "Seattle",
          "state": "Washington"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT02993068"
    },
    {
      "nct_id": "NCT03781063",
      "title": "Evaluation of Lasofoxifene Versus Fulvestrant in Advanced or Metastatic ER+/HER2- Breast Cancer With an ESR1 Mutation",
      "overall_status": "COMPLETED",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE2"
      ],
      "conditions": [
        "Locally Advanced or Metastatic Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Lasofoxifene",
          "type": "DRUG"
        },
        {
          "name": "Fulvestrant",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "Sermonix Pharmaceuticals Inc.",
      "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": "2019-09-20",
      "completion_date": "2025-05-08",
      "has_results": false,
      "last_update_posted_date": "2026-01-28",
      "last_synced_at": "2026-07-24T00:22:02.207Z",
      "location_count": 42,
      "location_summary": "Phoenix, Arizona • Yuma, Arizona • Duarte, California + 36 more",
      "locations": [
        {
          "city": "Phoenix",
          "state": "Arizona"
        },
        {
          "city": "Yuma",
          "state": "Arizona"
        },
        {
          "city": "Duarte",
          "state": "California"
        },
        {
          "city": "Fountain Valley",
          "state": "California"
        },
        {
          "city": "San Francisco",
          "state": "California"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT03781063"
    },
    {
      "nct_id": "NCT07612215",
      "title": "Elacestrant in Advanced Triple Positive Breast Cancer",
      "overall_status": "RECRUITING",
      "study_type": "INTERVENTIONAL",
      "phases": [
        "PHASE1",
        "PHASE2"
      ],
      "conditions": [
        "ER Positive, HER2 Positive Breast Cancer"
      ],
      "interventions": [
        {
          "name": "Elacestrant",
          "type": "DRUG"
        },
        {
          "name": "Trastuzumab",
          "type": "DRUG"
        },
        {
          "name": "Pertuzumab",
          "type": "DRUG"
        }
      ],
      "intervention_types": [
        "DRUG"
      ],
      "sponsor": "NYU Langone Health",
      "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": 50,
      "start_date": "2026-05-13",
      "completion_date": "2030-05",
      "has_results": false,
      "last_update_posted_date": "2026-05-28",
      "last_synced_at": "2026-07-24T00:22:02.207Z",
      "location_count": 1,
      "location_summary": "New York, New York",
      "locations": [
        {
          "city": "New York",
          "state": "New York"
        }
      ],
      "official_url": "https://clinicaltrials.gov/study/NCT07612215"
    }
  ]
}