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ClinicalTrials.gov public records Last synced Sep 23, 2026, 8:19 AM EDT

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Showing 1–24 of 392 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Estrogen Receptor Positive Breast Cancer Clear all
Active, not recruiting Phase 1Phase 2 Interventional

A Study to Learn About the Study Medicine (Called PF-07220060 in Combination With PF-07104091) In Participants With Breast Cancer and Solid Tumors

NCT05262400
View directory record Official record
Conditions
Breast Cancer, Solid Tumors
Interventions
PF-07220060 + PF-07104091 combination dose escalation, PF-07104091 + PF-07220060 + fulvestrant dose expansion, PF-07104091 + PF-07220060 + letrozole dose expansion
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years and older
Enrollment
235 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2027
U.S. locations
12
States / cities
Los Angeles, California • Santa Monica, California • Boston, Massachusetts + 5 more
Source: ClinicalTrials.gov public record
Updated Sep 13, 2026 · Synced Sep 23, 2026, 8:19 AM EDT
Completed Phase 2 Interventional Results available

A Study of Neoadjuvant Letrozole + Taselisib Versus Letrozole + Placebo in Post-Menopausal Women With Breast Cancer (LORELEI)

NCT02273973
View directory record Official record
Conditions
Breast Cancer
Interventions
Letrozole, Placebo, Taselisib
Drug · Other
Lead sponsor
Genentech, Inc.
Industry
Eligibility
18 Years and older · Female only
Enrollment
334 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2017
U.S. locations
8
States / cities
Santa Ana, California • Boston, Massachusetts • Basking Ridge, New Jersey + 5 more
Source: ClinicalTrials.gov public record
Updated May 20, 2018 · Synced Sep 23, 2026, 8:19 AM EDT
Completed Phase 1Phase 2 Interventional Results available

Tucatinib, Palbociclib and Letrozole in Metastatic Hormone Receptor Positive and HER2-positive Breast Cancer

NCT03054363
View directory record Official record
Conditions
Breast Cancer
Interventions
Tucatinib in Combination with Palbociclib and Letrozole
Drug
Lead sponsor
University of Colorado, Denver
Other
Eligibility
18 Years to 100 Years · Female only
Enrollment
42 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2023
U.S. locations
6
States / cities
Tucson, Arizona • Aurora, Colorado • Chicago, Illinois + 3 more
Source: ClinicalTrials.gov public record
Updated Nov 12, 2023 · Synced Sep 23, 2026, 8:19 AM 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 23, 2026 · Synced Sep 23, 2026, 8:19 AM EDT
Terminated Not applicable Interventional

Anti-Tumor Immunity Induced by Cryoablation of Invasive Breast Cancers

NCT01856036
View directory record Official record
Conditions
Breast Cancer
Interventions
Cryoablation
Procedure
Lead sponsor
Saint John's Cancer Institute
Other
Eligibility
18 Years and older
Enrollment
2 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
1
States / cities
Santa Monica, California
Source: ClinicalTrials.gov public record
Updated Feb 6, 2017 · Synced Sep 23, 2026, 8:19 AM EDT
Terminated Phase 2 Interventional Results available

Neo-adjuvant Therapy With Anastrozole Plus Pazopanib in Stage II and III ER+ Breast Cancer

NCT01394211
View directory record Official record
Conditions
Estrogen Receptor-positive Breast Cancer, Human Epidermal Growth Factor 2 Negative Carcinoma of Breast, Male Breast Cancer, Recurrent Breast Cancer, Stage II Breast Cancer, Stage IIIA Breast Cancer, Stage IIIB Breast Cancer
Interventions
anastrozole, pazopanib hydrochloride, therapeutic conventional surgery
Drug · Procedure
Lead sponsor
University of Arizona
Other
Eligibility
18 Years and older
Enrollment
2 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2012
U.S. locations
1
States / cities
Tucson, Arizona
Source: ClinicalTrials.gov public record
Updated Jul 25, 2018 · Synced Sep 23, 2026, 8:19 AM EDT
Withdrawn Phase 2 Interventional

COX Inhibition and Biomarkers During Neoadjuvant Chemoendocrine Therapy for ER+, HER2- Stage I-III Breast Cancer

NCT04038489
View directory record Official record
Conditions
Breast Cancer, Estrogen Receptor-positive Breast Cancer
Interventions
Aspirin, Tamoxifen Pill, Doxorubicin, Cyclophosphamide, Paclitaxel
Drug
Lead sponsor
University of Virginia
Other
Eligibility
18 Years and older
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2023
U.S. locations
1
States / cities
Charlottesville, Virginia
Source: ClinicalTrials.gov public record
Updated Nov 21, 2021 · Synced Sep 23, 2026, 8:19 AM EDT
Completed Phase 3 Interventional Results available

Fulvestrant With or Without Lapatinib in Treating Postmenopausal Women With Stage III or Stage IV Breast Cancer That is Hormone Receptor-Positive

NCT00390455
View directory record Official record
Conditions
Estrogen Receptor Positive, HER2 Positive Breast Carcinoma, HER2/Neu Negative, Progesterone Receptor Positive, Recurrent Breast Carcinoma, Stage IIIB Breast Cancer AJCC v7, Stage IIIC Breast Cancer AJCC v7, Stage IV Breast Cancer AJCC v6 and v7
Interventions
Fulvestrant, Laboratory Biomarker Analysis, Lapatinib Ditosylate, Placebo Administration
Drug · Other
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
18 Years and older · Female only
Enrollment
295 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2014
U.S. locations
368
States / cities
Little Rock, Arkansas • Arroyo Grande, California • Burbank, California + 259 more
Source: ClinicalTrials.gov public record
Updated Dec 19, 2019 · Synced Sep 23, 2026, 8:19 AM EDT
Recruiting Phase 1Phase 2 Interventional

Elacestrant in Advanced Triple Positive Breast Cancer

NCT07612215
View directory record Official record
Conditions
ER Positive, HER2 Positive Breast Cancer
Interventions
Elacestrant, Trastuzumab, Pertuzumab
Drug
Lead sponsor
NYU Langone Health
Other
Eligibility
18 Years and older · Female only
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2030
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated May 27, 2026 · Synced Sep 23, 2026, 8:19 AM EDT
Completed Phase 3 Interventional Results available

Suppression of Ovarian Function With Either Tamoxifen or Exemestane Compared With Tamoxifen Alone in Treating Premenopausal Women With Hormone-Responsive Breast Cancer

NCT00066690
View directory record Official record
Conditions
Estrogen Receptor Positive Breast Cancer, Progesterone Receptor Positive Tumor, Recurrent Breast Carcinoma, Stage IA Breast Cancer, Stage IB Breast Cancer, Stage IIA Breast Cancer, Stage IIB Breast Cancer, Stage IIIA Breast Cancer
Interventions
Exemestane, Laboratory Biomarker Analysis, Oophorectomy, Quality-of-Life Assessment, Radiation Therapy, Tamoxifen, Triptorelin
Drug · Other · Procedure + 1 more
Lead sponsor
ETOP IBCSG Partners Foundation
Network
Eligibility
18 Years to 65 Years · Female only
Enrollment
3,066 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2024
U.S. locations
480
States / cities
Birmingham, Alabama • Anchorage, Alaska • Scottsdale, Arizona + 323 more
Source: ClinicalTrials.gov public record
Updated Aug 25, 2026 · Synced Sep 23, 2026, 8:19 AM EDT
Recruiting Phase 3 Interventional

Evaluating the Addition of Adjuvant Chemotherapy to Ovarian Function Suppression Plus Endocrine Therapy in Premenopausal Patients With pN0-1, ER-Positive/HER2-Negative Breast Cancer and an Oncotype Recurrence Score Less Than or Equal to 25

NCT05879926
View directory record Official record
Conditions
Breast Cancer
Interventions
Ovarian Function Suppression + Aromatase Inhibitor, Adjuvant Chemotherapy + Ovarian Function Suppression
Drug
Lead sponsor
NRG Oncology
Other
Eligibility
18 Years to 60 Years · Female only
Enrollment
3,960 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2034
U.S. locations
1226
States / cities
Birmingham, Alabama • Anchorage, Alaska • Fairbanks, Alaska + 809 more
Source: ClinicalTrials.gov public record
Updated Sep 1, 2026 · Synced Sep 23, 2026, 8:19 AM EDT
Completed Phase 2 Interventional Results available

Phase II Trial of SAHA & Tamoxifen for Patients With Breast Cancer

NCT00365599
View directory record Official record
Conditions
Breast Cancer
Interventions
suberoylanilide hydroxamic acid (SAHA, Vorinostat), tamoxifen citrate (Tamoxifen)
Drug
Lead sponsor
H. Lee Moffitt Cancer Center and Research Institute
Other
Eligibility
18 Years and older
Enrollment
43 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2012
U.S. locations
8
States / cities
San Francisco, California • Boynton Beach, Florida • Orlando, Florida + 5 more
Source: ClinicalTrials.gov public record
Updated Nov 20, 2014 · Synced Sep 23, 2026, 8:19 AM EDT
Completed Phase 2 Interventional Results available

Fulvestrant With or Without Ganetespib in HR+ Breast Cancer

NCT01560416
View directory record Official record
Conditions
Breast Cancer
Interventions
Fulvestrant, Ganetespib
Drug
Lead sponsor
Dana-Farber Cancer Institute
Other
Eligibility
18 Years and older
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2016
U.S. locations
5
States / cities
Boston, Massachusetts • Concord, New Hampshire • Chapel Hill, North Carolina
Source: ClinicalTrials.gov public record
Updated Mar 2, 2026 · Synced Sep 23, 2026, 8:19 AM EDT
Active, not recruiting Phase 2 Interventional

(Z)-Endoxifen for the Treatment of Premenopausal Women With ER+/HER2- Breast Cancer

NCT05607004
View directory record Official record
Conditions
Breast Neoplasms, Invasive Breast Cancer, Estrogen-receptor-positive Breast Cancer, HER2-negative Breast Cancer
Interventions
(Z)-endoxifen, goserelin
Drug
Lead sponsor
Atossa Therapeutics, Inc.
Industry
Eligibility
18 Years and older · Female only
Enrollment
87 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
14
States / cities
Phoenix, Arizona • Tucson, Arizona • Los Angeles, California + 11 more
Source: ClinicalTrials.gov public record
Updated Jul 7, 2026 · Synced Sep 23, 2026, 8:19 AM EDT
Completed No phase listed Observational

Prospective Observational Study Evaluating Treatment Decision Impact of Prosigna® in Early Stage Breast Cancer Patients

NCT02625935
View directory record Official record
Conditions
Breast Cancer
Interventions
Not listed
Lead sponsor
NanoString Technologies, Inc.
Industry
Eligibility
Female only
Enrollment
206 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
4
States / cities
Fort Myers, Florida • Scarborough, Maine • Bethesda, Maryland + 1 more
Source: ClinicalTrials.gov public record
Updated Oct 12, 2017 · Synced Sep 23, 2026, 8:19 AM EDT
Active, not recruiting Phase 2 Interventional

Phase II Study of Neoadjuvant ArOMatase Inhibitor Therapy for ER+ Breast Cancer (NAOMI)

NCT04568616
View directory record Official record
Conditions
Breast Cancer, ER Positive Breast Cancer
Interventions
Letrozole 2.5mg
Drug
Lead sponsor
Dartmouth-Hitchcock Medical Center
Other
Eligibility
18 Years and older · Female only
Enrollment
178 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2029
U.S. locations
2
States / cities
Lebanon, New Hampshire
Source: ClinicalTrials.gov public record
Updated May 27, 2026 · Synced Sep 23, 2026, 8:19 AM EDT
Completed Phase 1 Interventional Results available

Study to Evaluate Safety, Tolerability, Pharmacokinetics, and Pharmacodynamics of Alobresib (Formerly GS-5829) in Adults With Advanced Solid Tumors and Lymphomas and in Combination With Exemestane or Fulvestrant in Adults With Estrogen Receptor Positive Breast Cancer

NCT02392611
View directory record Official record
Conditions
Solid Tumors and Lymphomas
Interventions
Alobresib, Exemestane, Fulvestrant
Drug
Lead sponsor
Gilead Sciences
Industry
Eligibility
18 Years and older
Enrollment
33 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2017
U.S. locations
4
States / cities
Scottsdale, Arizona • Fort Wayne, Indiana • Goshen, Indiana + 1 more
Source: ClinicalTrials.gov public record
Updated Dec 28, 2020 · Synced Sep 23, 2026, 8:19 AM EDT
Completed Phase 1 Interventional

A Phase I, Multicenter, Open-Label, Multi-Part, Dose-escalation Study of RAD1901 in Postmenopausal Women With Advanced Estrogen Receptor Positive and HER2-Negative Breast Cancer

NCT02338349
View directory record Official record
Conditions
Advanced ER+, HER2-Negative Breast Cancer
Interventions
Elacestrant
Drug
Lead sponsor
Stemline Therapeutics, Inc.
Industry
Eligibility
18 Years and older · Female only
Enrollment
57 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2020
U.S. locations
1
States / cities
Waltham, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 17, 2022 · Synced Sep 23, 2026, 8:19 AM 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 3, 2026 · Synced Sep 23, 2026, 8:19 AM EDT
Terminated Phase 1 Interventional

RO4929097 And Exemestane in Treating Pre- and Postmenopausal Patients With Advanced or Metastatic Breast Cancer

NCT01149356
View directory record Official record
Conditions
Estrogen Receptor Positive, HER2/Neu Negative, Male Breast Carcinoma, Recurrent Breast Carcinoma, Stage IIIB Breast Cancer, Stage IIIC Breast Cancer, Stage IV Breast Cancer
Interventions
Exemestane, Gamma-Secretase Inhibitor RO4929097, Goserelin Acetate
Drug
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
18 Years and older
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2013
U.S. locations
4
States / cities
Tampa, Florida • Atlanta, Georgia • Chapel Hill, North Carolina + 1 more
Source: ClinicalTrials.gov public record
Updated May 24, 2015 · Synced Sep 23, 2026, 8:19 AM EDT
Completed Phase 1 Interventional

MK2206 in Combination With Anastrozole, Fulvestrant, or Anastrozole and Fulvestrant in Treating Postmenopausal Women With Metastatic Breast Cancer

NCT01344031
View directory record Official record
Conditions
Estrogen Receptor Positive, Invasive Breast Carcinoma, Recurrent Breast Carcinoma, Stage IV Breast Cancer AJCC v6 and v7
Interventions
Akt Inhibitor MK2206, Anastrozole, Fulvestrant, Laboratory Biomarker Analysis
Drug · Other
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
18 Years and older · Female only
Enrollment
31 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2011
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Jul 22, 2018 · Synced Sep 23, 2026, 8:19 AM EDT
Active, not recruiting Phase 2 Interventional Results available

PD 0332991 and Anastrozole for Stage 2 or 3 Estrogen Receptor Positive and HER2 Negative Breast Cancer

NCT01723774
View directory record Official record
Conditions
Breast Neoplasms
Interventions
PD0332991, Anastrozole, Goserelin, Surgery (standard of care), Tumor biopsy
Drug · Procedure
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years and older · Female only
Enrollment
84 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2026
U.S. locations
4
States / cities
Birmingham, Alabama • Scottsdale, Arizona • Rochester, Minnesota + 1 more
Source: ClinicalTrials.gov public record
Updated Dec 8, 2025 · Synced Sep 23, 2026, 8:19 AM EDT
Terminated Phase 1 Interventional

Hydroxychloroquine in Metastatic Estrogen Receptor-Positive Breast Cancer Progressing on Hormonal Therapy

NCT02414776
View directory record Official record
Conditions
Estrogen Receptor Positive Breast Cancer
Interventions
hydroxychloroquine
Drug
Lead sponsor
Western Regional Medical Center
Other
Eligibility
18 Years and older
Enrollment
3 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2015
U.S. locations
1
States / cities
Goodyear, Arizona
Source: ClinicalTrials.gov public record
Updated Sep 26, 2017 · Synced Sep 23, 2026, 8:19 AM EDT
Terminated Phase 1Phase 2 Interventional

Palbociclib in Estrogen Receptor Positive (ER+) Human Epidermal Growth Factor Receptor 2 Positive (HER2+) Metastatic Breast Cancer

NCT03709082
View directory record Official record
Conditions
HER2-positive Breast Cancer, Breast Cancer Metastatic
Interventions
Palbociclib 75mg, Letrozole 2.5mg, T-DM1, Palbociclib 100mg, Palbociclib 125mg, Palbociclib
Drug
Lead sponsor
University of Kansas Medical Center
Other
Eligibility
18 Years and older · Female only
Enrollment
3 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
5
States / cities
Kansas City, Kansas • Overland Park, Kansas • Kansas City, Missouri + 1 more
Source: ClinicalTrials.gov public record
Updated Mar 4, 2024 · Synced Sep 23, 2026, 8:19 AM EDT