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ClinicalTrials.gov public records Last synced Oct 20, 2026, 5:38 PM EDT

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Showing 1–24 of 403 matching trials from the live ClinicalTrials.gov search.
Filters: Condition: ER-Positive Breast Cancer Clear all
Recruiting Not applicable Interventional

Multicenter Trial for Eliminating Breast Cancer Surgery or Radiotherapy in Exceptional Responders to Neoadjuvant Systemic Therapy

NCT02945579
View directory record Official record
Conditions
Estrogen Receptor Negative, HER2 Positive Breast Carcinoma, HER2/Neu Negative, Invasive Breast Carcinoma, Progesterone Receptor Negative, Stage I Breast Cancer AJCC v7, Stage IA Breast Cancer AJCC v7, Stage IB Breast Cancer AJCC v7, Stage II Breast Cancer AJCC v6 and v7, Stage IIA Breast Cancer AJCC v6 and v7, Stage IIB Breast Cancer AJCC v6 and v7, Triple-Negative Breast Carcinoma
Interventions
Undergo EBRT, Laboratory Biomarker Analysis, Quality-of-Life Assessment, Questionnaire Administration, Partial Breast Irradiation
Radiation · Other
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
30 Years and older · Female only
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2028
U.S. locations
8
States / cities
Gilbert, Arizona • Jacksonville, Florida • Honolulu, Hawaii + 5 more
Source: ClinicalTrials.gov public record
Updated Sep 25, 2026 · Synced Oct 20, 2026, 5:38 PM EDT
Completed Phase 2 Interventional Results available

Sapanisertib in Combination With Fulvestrant in Women With Advanced or Metastatic Breast Cancer After Aromatase Inhibitor Therapy

NCT02756364
View directory record Official record
Conditions
Breast Neoplasms
Interventions
Fulvestrant, Sapanisertib
Drug
Lead sponsor
Calithera Biosciences, Inc
Industry
Eligibility
18 Years and older · Female only
Enrollment
141 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2019
U.S. locations
30
States / cities
Mobile, Alabama • Bakersfield, California • Fullerton, California + 26 more
Source: ClinicalTrials.gov public record
Updated Feb 8, 2023 · Synced Oct 20, 2026, 5:38 PM EDT
Not listed No phase listed Observational

Biomarkers in Predicting Response to Tamoxifen and Letrozole in Postmenopausal Women With Primary Breast Cancer Treated on Clinical Trial CAN-NCIC-MA17

NCT00897065
View directory record Official record
Conditions
Breast Cancer
Interventions
microarray analysis, polymerase chain reaction, protein expression analysis, diagnostic laboratory biomarker analysis, fluorescent antibody technique, immunohistochemistry staining method, immunologic technique
Genetic · Other
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
Female only
Enrollment
957 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2006
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 10, 2013 · Synced Oct 20, 2026, 5:38 PM EDT
Recruiting Phase 1Phase 2 Interventional

Phase 1/2 Study to Evaluate EP0062 as Monotherapy and in Combination in Patients With Advanced or Metastatic AR+/HER-2-/ER+ Breast Cancer

NCT05573126
View directory record Official record
Conditions
Hormone Receptor-positive Breast Cancer, Hormone Receptor Positive HER-2 Negative Breast Cancer, Metastatic Breast Cancer
Interventions
EP0062, Elacestrant, Everolimus, Abemaciclib, Fulvestrant, Exemestane
Drug
Lead sponsor
Ellipses Pharma
Industry
Eligibility
18 Years and older · Female only
Enrollment
95 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2028
U.S. locations
7
States / cities
New Haven, Connecticut • Tampa, Florida • Boston, Massachusetts + 4 more
Source: ClinicalTrials.gov public record
Updated Jun 22, 2026 · Synced Oct 20, 2026, 5:38 PM EDT
Active, not recruiting Phase 2 Interventional Results available

Serial FES PET/CT to Measure Hormone Expression in Patients Undergoing Endocrine Targeted Therapy

NCT04692103
View directory record Official record
Conditions
Estrogen Receptor Positive, Primary or Recurrent Breast Carcinoma, Stage IV Breast Cancer AJCC v6 and v7
Interventions
F-18 16 Alpha-Fluoroestradiol, Positron Emission Tomography, Computed Tomography, Fludeoxyglucose F-18, Laboratory Biomarker Analysis
Drug · Procedure · Other
Lead sponsor
University of Washington
Other
Eligibility
18 Years and older
Enrollment
2 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2041
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Jul 1, 2026 · Synced Oct 20, 2026, 5:38 PM EDT
Completed Phase 2 Interventional Results available

Efficacy and Safety Study of Enzalutamide in Combination With Exemestane in Patients With Advanced Breast Cancer

NCT02007512
View directory record Official record
Conditions
Breast Cancer
Interventions
Enzalutamide, exemestane, Placebo (for enzalutamide)
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years and older · Female only
Enrollment
247 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2024
U.S. locations
89
States / cities
Aurora, Colorado • Colorado Springs, Colorado • Lakewood, Colorado + 54 more
Source: ClinicalTrials.gov public record
Updated Sep 2, 2025 · Synced Oct 20, 2026, 5:38 PM EDT
Active, not recruiting Phase 3 Interventional Results available

A Phase-3, Open-Label, Randomized Study of Dato-DXd Versus Investigator's Choice of Chemotherapy (ICC) in Participants With Inoperable or Metastatic HR-Positive, HER2-Negative Breast Cancer Who Have Been Treated With One or Two Prior Lines of Systemic Chemotherapy (TROPION-Breast01)

NCT05104866
View directory record Official record
Conditions
Breast Cancer
Interventions
Dato-DXd, Capecitabine, Gemcitabine, Eribulin, Vinorelbine
Drug
Lead sponsor
AstraZeneca
Industry
Eligibility
18 Years and older
Enrollment
732 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
14
States / cities
Duarte, California • Los Angeles, California • Palo Alto, California + 10 more
Source: ClinicalTrials.gov public record
Updated Aug 24, 2026 · Synced Oct 20, 2026, 5:38 PM EDT
Completed No phase listed Observational Accepts healthy volunteers

Evaluation of Endocrine Therapy Effects of Host Immunity in Early Stage Breast Cancer

NCT03719495
View directory record Official record
Conditions
Breast Cancer, Estrogen Receptor-positive Breast Cancer, Healthy
Interventions
Not listed
Lead sponsor
Duke University
Other
Eligibility
18 Years to 75 Years · Female only
Enrollment
68 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2023
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated May 16, 2024 · Synced Oct 20, 2026, 5:38 PM EDT
Recruiting No phase listed Observational

Longitudinal Tumor Burden Quantification Using Circulating Tumor DNA in Metastatic Lobular Breast Cancer

NCT06666439
View directory record Official record
Conditions
Metastatic Invasive Lobular Carcinoma (mILC)
Interventions
circulating tumor DNA (ctDNA)
Diagnostic Test
Lead sponsor
Julia Foldi
Other
Eligibility
18 Years and older · Female only
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2029
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jan 20, 2026 · Synced Oct 20, 2026, 5:38 PM EDT
Completed Phase 2 Interventional Results available

Cabozantinib in Women With Metastatic Hormone-Receptor-Positive Breast Cancer

NCT01441947
View directory record Official record
Conditions
Breast Cancer
Interventions
Cabozantinib, Fulvestrant
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older
Enrollment
68 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2019
U.S. locations
4
States / cities
Boston, Massachusetts • New York, New York
Source: ClinicalTrials.gov public record
Updated May 25, 2025 · Synced Oct 20, 2026, 5:38 PM EDT
Terminated Early Phase 1 Interventional

Letrozole in Treating Postmenopausal Women With Stage I, II or III Breast Cancer That Can Be Removed by Surgery

NCT00651976
View directory record Official record
Conditions
Breast Cancer
Interventions
letrozole, Blood Collection, biopsy/lumpectomy/mastectomy
Drug · Other · Procedure
Lead sponsor
Vanderbilt-Ingram Cancer Center
Other
Eligibility
18 Years and older · Female only
Enrollment
213 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2018
U.S. locations
5
States / cities
Atlanta, Georgia • Tulsa, Oklahoma • Pittsburgh, Pennsylvania + 1 more
Source: ClinicalTrials.gov public record
Updated Oct 15, 2018 · Synced Oct 20, 2026, 5:38 PM EDT
Withdrawn Phase 1 Interventional Accepts healthy volunteers

ISPY-P1.01:Evaluating the Safety of Weekly Paclitaxel With Trastuzumab Duocarmazine (SYD985) in Patients With Metastatic Cancer

NCT04602117
View directory record Official record
Conditions
HER2-positive Breast Cancer, HER2 Low, SYD-985, SYD985, Vic-trastuzumab Duocarmazine, Metastatic Cancer, Metastatic Breast Cancer, Metastatic Gastrointestinal Carcinoid Tumor, Metastatic, HER2 Low Breast Cancer, GastroEsophageal Cancer, Gastroesophageal Adenocarcinoma, Endometrium Tumor, Ovarian Cancer, Ovarian Carcinoma, HER2-positive Gastric Cancer, HER2-positive Metastatic Breast Cancer, HER2 Mutation-Related Tumors, HER-2 Protein Overexpression, HER2 Low HR Positive, HR Positive, Hormone Receptor-positive Breast Cancer, Estrogen Receptor Positive Tumor, Progesterone Receptor-positive Breast Cancer, Triple Negative Breast Cancer, Hormone Receptor Negative Breast Carcinoma, Bladder Cancer
Interventions
Vic-trastuzumab duocarmazine (SYD985) + paclitaxel
Drug
Lead sponsor
QuantumLeap Healthcare Collaborative
Other
Eligibility
18 Years and older
Healthy volunteers
Accepts healthy volunteers
Timeline
2021
U.S. locations
1
States / cities
Aurora, Colorado
Source: ClinicalTrials.gov public record
Updated Nov 18, 2023 · Synced Oct 20, 2026, 5:38 PM EDT
Active, not recruiting Phase 3 Interventional

Vepdegestrant (ARV-471/PF-07850327) + Palbociclib vs Letrozole + Palbociclib in ER(+)/HER2(-) Advanced Breast Cancer

NCT05909397
View directory record Official record
Conditions
Breast Cancer
Interventions
Vepdegestrant (ARV-471/PF-07850327), Palbociclib, Letrozole
Drug · Combination Product
Lead sponsor
Pfizer
Industry
Eligibility
18 Years and older
Enrollment
59 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2026
U.S. locations
3
States / cities
Plantation, Florida • Norfolk, Virginia
Source: ClinicalTrials.gov public record
Updated Feb 10, 2026 · Synced Oct 20, 2026, 5:38 PM EDT
Active, not recruiting Phase 2 Interventional

Study of Belzutifan (MK-6482) Plus Fulvestrant for ER+/HER2- Metastatic Breast Cancer (MK-6482-029/LITESPARK-029)

NCT06428396
View directory record Official record
Conditions
Metastatic Breast Cancer
Interventions
Belzutifan, Fulvestrant, Everolimus, Exemestane
Drug
Lead sponsor
Merck Sharp & Dohme LLC
Industry
Eligibility
18 Years and older
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2028
U.S. locations
14
States / cities
Goodyear, Arizona • Beverly Hills, California • La Jolla, California + 11 more
Source: ClinicalTrials.gov public record
Updated Aug 28, 2026 · Synced Oct 20, 2026, 5:38 PM EDT
Active, not recruiting Phase 1Phase 2 Interventional

Study of LEE011, BYL719 and Letrozole in Advanced ER+ Breast Cancer

NCT01872260
View directory record Official record
Conditions
Breast Cancer
Interventions
LEE011, Letrozole, BYL719
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
18 Years to 100 Years · Female only
Enrollment
259 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2027
U.S. locations
10
States / cities
San Diego, California • San Francisco, California • Tampa, Florida + 5 more
Source: ClinicalTrials.gov public record
Updated Sep 18, 2026 · Synced Oct 20, 2026, 5:38 PM EDT
Completed Not applicable Interventional

Intensity Modulated Accelerated Partial Breast Irradiation Before Surgery in Treating Older Patients With Hormone Responsive Stage 0-I Breast Cancer

NCT02186470
View directory record Official record
Conditions
Estrogen Receptor-positive Breast Cancer, Invasive Ductal Breast Carcinoma, Invasive Ductal Breast Carcinoma With Predominant Intraductal Component, Medullary Ductal Breast Carcinoma With Lymphocytic Infiltrate, Mucinous Ductal Breast Carcinoma, Papillary Ductal Breast Carcinoma, Progesterone Receptor-positive Breast Cancer, Stage IA Breast Cancer, Stage IB Breast Cancer, Tubular Ductal Breast Carcinoma
Interventions
accelerated partial breast irradiation, intensity-modulated radiation therapy, image-guided radiation therapy, therapeutic conventional surgery
Radiation · Procedure
Lead sponsor
Ohio State University Comprehensive Cancer Center
Other
Eligibility
50 Years and older · Female only
Enrollment
22 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2025
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Sep 22, 2025 · Synced Oct 20, 2026, 5:38 PM EDT
Completed Phase 2 Interventional Results available

Anastrozole and ZD1839 Compared With Fulvestrant and ZD1839 in Postmenopausal Women w/ Metastatic Breast Cancer

NCT00057941
View directory record Official record
Conditions
Estrogen Receptor-positive Breast Cancer, Progesterone Receptor-positive Breast Cancer, Recurrent Breast Cancer, Stage IV Breast Cancer
Interventions
anastrozole, gefitinib, fulvestrant, laboratory biomarker analysis
Drug · Other
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
18 Years and older · Female only
Enrollment
148 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2012
U.S. locations
1
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated May 12, 2014 · Synced Oct 20, 2026, 5:38 PM EDT
Terminated Phase 2 Interventional Results available

Phase II Study of Everolimus Beyond Progression

NCT02269670
View directory record Official record
Conditions
Estrogen Receptor-positive Breast Cancer, HER2-negative Breast Cancer, Progesterone Receptor-positive Breast Cancer, Recurrent Breast Cancer, Stage IIIA Breast Cancer, Stage IIIB Breast Cancer, Stage IIIC Breast Cancer, Stage IV Breast Cancer
Interventions
everolimus, anastrozole, letrozole, tamoxifen citrate, fulvestrant, megestrol acetate
Drug
Lead sponsor
Emory University
Other
Eligibility
19 Years and older · Female only
Enrollment
3 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2021
U.S. locations
3
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Apr 5, 2022 · Synced Oct 20, 2026, 5:38 PM EDT
Active, not recruiting Phase 2 Interventional

CDK 4/6 Inhibitor, Ribociclib, With Adjuvant Endocrine Therapy for ER-positive Breast Cancer

NCT03285412
View directory record Official record
Conditions
Breast Cancer
Interventions
Ribociclib, Endocrine therapy
Drug · Other
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older · Female only
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2026
U.S. locations
3
States / cities
Boston, Massachusetts • Danvers, Massachusetts
Source: ClinicalTrials.gov public record
Updated Dec 22, 2025 · Synced Oct 20, 2026, 5:38 PM EDT
Completed No phase listed Observational

Chemotherapy Decisions and Outcomes in Older Women With Newly Diagnosed Breast Cancer

NCT00068328
View directory record Official record
Conditions
Breast Cancer, Psychosocial Effects of Cancer and Its Treatment
Interventions
psychosocial assessment and care, quality-of-life assessment
Procedure
Lead sponsor
Alliance for Clinical Trials in Oncology
Other
Eligibility
65 Years and older · Female only
Enrollment
1,706 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2016
U.S. locations
85
States / cities
Mountain View, California • Palo Alto, California • Pismo Beach, California + 66 more
Source: ClinicalTrials.gov public record
Updated Aug 8, 2017 · Synced Oct 20, 2026, 5:38 PM EDT
Terminated Phase 4 Interventional

Effect of HSD3B1 (1245C) Gene Mutation on Treatment of Stage I-III Breast Cancer

NCT05183828
View directory record Official record
Conditions
Anatomic Stage I Breast Cancer AJCC v8, Anatomic Stage II Breast Cancer AJCC v8, Anatomic Stage III Breast Cancer AJCC v8, Breast Adenocarcinoma, Invasive Breast Carcinoma of No Special Type
Interventions
Biospecimen Collection, Letrozole, Questionnaire Administration
Procedure · Drug · Other
Lead sponsor
University of Washington
Other
Eligibility
18 Years and older · Female only
Enrollment
62 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2026
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Jun 4, 2026 · Synced Oct 20, 2026, 5:38 PM EDT
Terminated Phase 2 Interventional Results available

Neoadj ph 2 AI Plus Everolimus in Postmenopausal Women w/ ER Pos/HER2 Neg, Low Risk Score

NCT02236572
View directory record Official record
Conditions
Breast Cancer
Interventions
Everolimus
Drug
Lead sponsor
Yale University
Other
Eligibility
18 Years and older · Female only
Enrollment
17 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2021
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Feb 1, 2022 · Synced Oct 20, 2026, 5:38 PM EDT
Recruiting No phase listed Observational

Role of the Immune Environment in Response to Therapy in Breast Cancer

NCT05396612
View directory record Official record
Conditions
Breast Cancer, ER Positive Breast Cancer, HER2-negative Breast Cancer, TNBC - Triple-Negative Breast Cancer
Interventions
Collection of personal health information from women treated at the University of Pennsylvania under an approved HIPAA waiver.
Other
Lead sponsor
Abramson Cancer Center at Penn Medicine
Other
Eligibility
18 Years and older · Female only
Enrollment
300 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2032
U.S. locations
1
States / cities
Philadelphia, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Jul 8, 2025 · Synced Oct 20, 2026, 5:38 PM EDT
Active, not recruiting Phase 2 Interventional Results available

Neoadjuvant Pembrolizumab + Decitabine Followed by Std Neoadj Chemo for Locally Advanced HER2- Breast Ca

NCT02957968
View directory record Official record
Conditions
Breast Adenocarcinoma, Estrogen Receptor- Negative Breast Cancer, Estrogen Receptor-positive Breast Cancer, HER2/Neu Negative, Invasive Breast Carcinoma, Progesterone Receptor Negative, Progesterone Receptor Positive Tumor, Stage II Breast Cancer, Stage IIA Breast Cancer, Stage IIB Breast Cancer, Stage IIIA Breast Cancer, Stage IIIB Breast Cancer, Triple-negative Breast Carcinoma
Interventions
Doxorubicin, Cyclophosphamide, Paclitaxel, Carboplatin, Decitabine, Pembrolizumab
Drug
Lead sponsor
Virginia Commonwealth University
Other
Eligibility
18 Years and older
Enrollment
46 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2027
U.S. locations
4
States / cities
Edgewood, Kentucky • Columbus, Ohio • Charlottesville, Virginia + 1 more
Source: ClinicalTrials.gov public record
Updated Jul 1, 2026 · Synced Oct 20, 2026, 5:38 PM EDT