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ClinicalTrials.gov public records Last synced Oct 23, 2026, 4:18 PM EDT

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Showing 1–24 of 338 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: Femara Clear all
Completed Phase 2 Interventional Results available

Pembrolizumab and Doxorubicin Hydrochloride or Anti-Estrogen Therapy in Treating Patients With Triple-Negative or Hormone Receptor-Positive Metastatic Breast Cancer

NCT02648477
View directory record Official record
Conditions
Estrogen Receptor Negative, Estrogen Receptor Positive, HER2/Neu Negative, Progesterone Receptor Negative, Progesterone Receptor Positive, Stage IV Breast Cancer, Triple-Negative Breast Carcinoma
Interventions
Anastrozole, Doxorubicin Hydrochloride, Exemestane, Laboratory Biomarker Analysis, Letrozole, Pembrolizumab
Drug · Other · Biological
Lead sponsor
City of Hope Medical Center
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2023
U.S. locations
6
States / cities
Corona, California • Duarte, California • Lancaster, California + 3 more
Source: ClinicalTrials.gov public record
Updated Mar 19, 2024 · Synced Oct 23, 2026, 4:18 PM EDT
Recruiting Phase 1Phase 2 Interventional

ORION-1: Study of AVZO-023 as a Single Agent and in Combination With AVZO-021, and/or Endocrine Therapy in Advanced Solid Tumors

NCT06998407
View directory record Official record
Conditions
HR+/HER2- Breast Cancer, HR+, HER2-, Advanced Breast Cancer
Interventions
AVZO-021, Fulvestrant, Letrozole, AVZO-023
Drug
Lead sponsor
Avenzo Therapeutics, Inc.
Industry
Eligibility
18 Years and older
Enrollment
380 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2030
U.S. locations
16
States / cities
Los Angeles, California • New Haven, Connecticut • Orlando, Florida + 12 more
Source: ClinicalTrials.gov public record
Updated Aug 10, 2026 · Synced Oct 23, 2026, 4:18 PM EDT
Completed Phase 1Phase 2 Interventional Results available

Tamoxifen or Letrozole in Treating Women With Ductal Carcinoma in Situ

NCT00290745
View directory record Official record
Conditions
Breast Cancer
Interventions
letrozole, tamoxifen citrate, conventional surgery, neoadjuvant therapy
Drug · Procedure
Lead sponsor
University of California, San Francisco
Other
Eligibility
Female only
Enrollment
79 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2011
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Dec 4, 2020 · Synced Oct 23, 2026, 4:18 PM EDT
Terminated Not applicable Interventional Results available

Chemotherapy Before Surgery and Tissue Sample Collection in Patients With Stage IIA-IIIC Breast Cancer

NCT01897441
View directory record Official record
Conditions
Stage IIA Breast Cancer, Stage IIB Breast Cancer, Stage IIIA Breast Cancer, Stage IIIB Breast Cancer, Stage IIIC Breast Cancer, Stage IV Breast Cancer
Interventions
Cyclophosphamide, Cytology Specimen Collection Procedure, Doxorubicin Hydrochloride, Laboratory Biomarker Analysis, Paclitaxel, Trastuzumab, Endocrine therapy
Drug · Other · Biological
Lead sponsor
Albert Einstein College of Medicine
Other
Eligibility
18 Years and older
Enrollment
31 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2023
U.S. locations
1
States / cities
The Bronx, New York
Source: ClinicalTrials.gov public record
Updated Dec 24, 2024 · Synced Oct 23, 2026, 4:18 PM EDT
Recruiting Phase 2 Interventional

Functional Imaging in Prediction of Response to Abemaciclib for Advanced Hormone Receptor-Positive, HER2-Negative Breast Cancer

NCT06179303
View directory record Official record
Conditions
Anatomic Stage III Breast Cancer AJCC v8, Anatomic Stage IV Breast Cancer AJCC v8, Locally Advanced Unresectable HER2-Negative Breast Carcinoma, Locally Advanced Unresectable Hormone Receptor-Positive Breast Carcinoma, Metastatic HER2-Negative Breast Carcinoma, Metastatic Hormone Receptor-Positive Breast Carcinoma
Interventions
Abemaciclib, Anastrozole, Biospecimen Collection, Computed Tomography, Diagnostic Imaging Testing, Exemestane, Fludeoxyglucose F-18, Fluorine F 18 Fluoro Furanyl Norprogesterone, Fulvestrant, Gonadotropin-releasing Hormone Analog, Letrozole, Positron Emission Tomography, Tamoxifen, Therapeutic Estradiol
Drug · Procedure · Other + 1 more
Lead sponsor
University of Washington
Other
Eligibility
18 Years and older
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2028
U.S. locations
3
States / cities
St Louis, Missouri • Chapel Hill, North Carolina • Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Sep 24, 2026 · Synced Oct 23, 2026, 4:18 PM EDT
Completed Not applicable Interventional Results available

Zoledronate in Treating Osteopenia or Osteoporosis in Postmenopausal Women Receiving Letrozole for Stage I, Stage II, or Stage IIIA Primary Breast Cancer

NCT00436917
View directory record Official record
Conditions
Breast Cancer, Osteoporosis
Interventions
zoledronic acid, Letrozole as adjuvant therapy
Drug · Procedure
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 120 Years · Female only
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2016
U.S. locations
2
States / cities
Jacksonville, Florida • Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Sep 11, 2019 · Synced Oct 23, 2026, 4:18 PM EDT
Completed Phase 1Phase 2 Interventional

Study of XL147 (SAR245408) or XL765 (SAR245409) in Combination With Letrozole in Subjects With Breast Cancer

NCT01082068
View directory record Official record
Conditions
Breast Cancer
Interventions
XL147 (SAR245408), XL765 (SAR245409), letrozole (Femara)
Drug
Lead sponsor
Sanofi
Industry
Eligibility
18 Years and older · Female only
Enrollment
72 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2013
U.S. locations
11
States / cities
Los Angeles, California • Denver, Colorado • Fort Meyers, Florida + 8 more
Source: ClinicalTrials.gov public record
Updated Jun 3, 2016 · Synced Oct 23, 2026, 4:18 PM EDT
Completed No phase listed Observational Results available

Pilot Study to Evaluate the Effect of Aromatase Inhibitor Therapy on Pain Threshold in Breast Cancer Patients

NCT01814397
View directory record Official record
Conditions
Breast Cancer, Pain, Arthralgia
Interventions
Anastrozole, exemestane, letrozole
Drug
Lead sponsor
University of Michigan Rogel Cancer Center
Other
Eligibility
21 Years and older · Female only
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2013
U.S. locations
1
States / cities
Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Feb 7, 2024 · Synced Oct 23, 2026, 4:18 PM EDT
Recruiting Phase 1 Interventional

Prototype DAA/TAA Vaccine Targeting MUC1 for Immune Interception and Prevention in Ductal Carcinoma In Situ

NCT06218303
View directory record Official record
Conditions
Ductal Carcinoma in Situ
Interventions
MUC1 Peptide Vaccine, Hiltonol®, Aromatase Inhibitor, Selective estrogen receptor modulator (SERM)
Biological · Drug
Lead sponsor
Finn, Olivera, PhD
Other
Eligibility
18 Years and older · Female only
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2029
U.S. locations
1
States / cities
Pittsburgh, Pennsylvania
Source: ClinicalTrials.gov public record
Updated Oct 16, 2026 · Synced Oct 23, 2026, 4:18 PM EDT
Completed Not applicable Interventional Results available

Letrozole as a Treatment of Endometrial Cancer

NCT00997373
View directory record Official record
Conditions
Endometrial Carcinoma
Interventions
Letrozole
Drug
Lead sponsor
University of California, Davis
Other
Eligibility
40 Years and older · Female only
Enrollment
43 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2013
U.S. locations
2
States / cities
Sacramento, California
Source: ClinicalTrials.gov public record
Updated May 30, 2017 · Synced Oct 23, 2026, 4:18 PM EDT
Recruiting Phase 2 Interventional

DCIS: RECAST Trial Ductal Carcinoma In Situ: Re-Evaluating Conditions for Active Surveillance Suitability as Treatment

NCT06075953
View directory record Official record
Conditions
Ductal Carcinoma in Situ
Interventions
Tamoxifen, Exemestane, Letrozole, Anastrazole, Testosterone + Anastrazole, Elacestrant, Z-endoxifen
Drug
Lead sponsor
QuantumLeap Healthcare Collaborative
Other
Eligibility
18 Years and older · Female only
Enrollment
400 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2033
U.S. locations
29
States / cities
Berkeley, California • Duarte, California • Irvine, California + 22 more
Source: ClinicalTrials.gov public record
Updated Sep 28, 2026 · Synced Oct 23, 2026, 4:18 PM EDT
Active, not recruiting Phase 2 Interventional

PF-07104091 as a Single Agent and in Combination Therapy

NCT04553133
View directory record Official record
Conditions
Small Cell Lung Cancer, Ovarian Cancer, Breast Cancer
Interventions
PF-07104091 monotherapy dose escalation, PF-07104091 + palbociclib + fulvestrant, PF-07104091 + palbociclib + letrozole, PF-07104091 monotherapy dose expansion (ovarian), PF-07104091 monotherapy dose expansion (SCLC), PF-07104091 + Fulvestrant (post CDK4/6), PF-0704091 + Fulvestrant (post CDK4/6)
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years and older
Enrollment
157 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2026
U.S. locations
17
States / cities
Clive, Iowa • Des Moines, Iowa • Louisville, Kentucky + 7 more
Source: ClinicalTrials.gov public record
Updated May 6, 2026 · Synced Oct 23, 2026, 4:18 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 23, 2026, 4:18 PM EDT
Completed Phase 2 Interventional

Biological and Clinical Effects of Palbociclib With Ovarian Suppression and Letrozole in the Neoadjuvant Treatment of Breast Cancer

NCT03628066
View directory record Official record
Conditions
Breast Cancer
Interventions
Letrozole, Palbociclib, Goserelin, Oncotype DX Breast Recurrence Score
Drug · Diagnostic Test
Lead sponsor
NSABP Foundation Inc
Network
Eligibility
18 Years and older · Female only
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
11
States / cities
Fountain Valley, California • Laguna Hills, California • Long Beach, California + 5 more
Source: ClinicalTrials.gov public record
Updated Apr 20, 2022 · Synced Oct 23, 2026, 4:18 PM EDT
Recruiting Phase 2 Interventional

Trial of Pre-operative Neratinib and Endocrine Therapy With Trastuzumab in ER-Positive, HER-2 Positive Breast Cancers

NCT04886531
View directory record Official record
Conditions
Breast Cancer, HER2-positive Breast Cancer, ER Positive Breast Cancer, PR-Positive Breast Cancer
Interventions
Neratinib, Letrozole (L) or Anastrozole (A), Trastuzumab
Drug
Lead sponsor
Ruth O'Regan
Other
Eligibility
18 Years and older
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2027
U.S. locations
4
States / cities
Chicago, Illinois • Rochester, New York • Hershey, Pennsylvania + 1 more
Source: ClinicalTrials.gov public record
Updated Sep 3, 2026 · Synced Oct 23, 2026, 4:18 PM EDT
Terminated Phase 3 Interventional Results available

Amcenestrant (SAR439859) Plus Palbociclib as First Line Therapy for Patients With ER (+) HER2(-) Advanced Breast Cancer

NCT04478266
View directory record Official record
Conditions
Breast Cancer
Interventions
Amcenestrant-matching placebo, SAR439859, Palbociclib, Letrozole, Goserelin, Letrozole-matching placebo
Drug
Lead sponsor
Sanofi
Industry
Eligibility
18 Years and older
Enrollment
1,068 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2023
U.S. locations
45
States / cities
Daphne, Alabama • Glendale, Arizona • Tucson, Arizona + 40 more
Source: ClinicalTrials.gov public record
Updated Sep 11, 2025 · Synced Oct 23, 2026, 4:18 PM EDT
Completed Not applicable Interventional

Omega-3 Fatty Acids in Preventing Joint Symptoms in Patients With Stage I-III Breast Cancer Receiving Anastrozole, Exemestane, or Letrozole

NCT01478477
View directory record Official record
Conditions
Recurrent Breast Cancer, Stage IA Breast Cancer, Stage IB Breast Cancer, Stage II Breast Cancer, Stage IIIA Breast Cancer, Stage IIIB Breast Cancer, Stage IIIC Breast Cancer
Interventions
omega-3 fatty acid supplement, Placebo, Clinical assessments, Assessment of therapy complications, Magnetic Resonance Imaging, Correlative/special studies
Dietary Supplement · Other · Procedure
Lead sponsor
Ohio State University Comprehensive Cancer Center
Other
Eligibility
18 Years and older · Female only
Enrollment
44 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
1
States / cities
Columbus, Ohio
Source: ClinicalTrials.gov public record
Updated Feb 27, 2023 · Synced Oct 23, 2026, 4:18 PM EDT
Active, not recruiting Phase 3 Interventional

OP-1250 (Palazestrant) vs. Standard of Care for the Treatment of ER+/HER2- Advanced Breast Cancer

NCT06016738
View directory record Official record
Conditions
Breast Cancer, Advanced Breast Cancer, Metastatic Breast Cancer, ER Positive Breast Cancer, HER2 Negative Breast Carcinoma
Interventions
Palazestrant, Fulvestrant, Anastrozole, Letrozole, Exemestane
Drug
Lead sponsor
Olema Pharmaceuticals, Inc.
Industry
Eligibility
18 Years and older
Enrollment
510 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2028
U.S. locations
47
States / cities
Tucson, Arizona • Fountain Valley, California • Glendale, California + 39 more
Source: ClinicalTrials.gov public record
Updated Aug 13, 2026 · Synced Oct 23, 2026, 4:18 PM EDT
Not yet recruiting Phase 2 Interventional

Neu Direction: Testing the Efficacy of Adding HER Inhibition to Standard of Care in Metastatic MLH1-low Endocrine-resistant ER+/HER2- Breast Cancer

NCT07729046
View directory record Official record
Conditions
Metastatic Invasive Breast Cancer, Resistant Breast Cancer, ER+, HER2-, Metastatic Breast Cancer
Interventions
Neratinib + endocrine therapy, Endocrine therapy may include one of the following therapies: letrozole, anastrozole, exemestane, tamoxifen or fulvestrant, CDK4/6 + Endocrine therapy
Drug
Lead sponsor
University of California, San Diego
Other
Eligibility
18 Years and older · Female only
Enrollment
150 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2027 – 2035
U.S. locations
1
States / cities
La Jolla, California
Source: ClinicalTrials.gov public record
Updated Jul 27, 2026 · Synced Oct 23, 2026, 4:18 PM EDT
Terminated Phase 3 Interventional Results available

A Companion Sample Collection Protocol to Support the Discovery of Breast Cancer Aberrations With Treatment of CDK4/6 Therapy/LEE011/Ribociclib

NCT03050398
View directory record Official record
Conditions
Breast Cancer
Interventions
Ribociclib, letrozole
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
18 Years and older
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
6
States / cities
Sedona, Arizona • Long Beach, California • Charlotte, North Carolina + 3 more
Source: ClinicalTrials.gov public record
Updated May 28, 2020 · Synced Oct 23, 2026, 4:18 PM EDT
Terminated Phase 2 Interventional Results available

Ph II Letrozole + OSI-774 (Tarceva) in Post-menopausal, w/ ER and/or PR-positive Met Breast Cancer.

NCT00611715
View directory record Official record
Conditions
Breast Cancer
Interventions
erlotinib hydrochloride, letrozole, fluorescence in situ hybridization, immunohistochemistry staining method, laboratory biomarker analysis
Drug · Genetic · Other
Lead sponsor
Vanderbilt-Ingram Cancer Center
Other
Eligibility
18 Years and older · Female only
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2008
U.S. locations
9
States / cities
Macon, Georgia • Hopkinsville, Kentucky • Paducah, Kentucky + 5 more
Source: ClinicalTrials.gov public record
Updated Aug 9, 2012 · Synced Oct 23, 2026, 4:18 PM EDT
Terminated Phase 1 Interventional Results available

A Dose Escalation Study Evaluating the Safety and Tolerability of GDC-0032 in Participants With Locally Advanced or Metastatic Solid Tumors or Non-Hodgkin's Lymphoma (NHL) and in Combination With Endocrine Therapy in Locally Advanced or Metastatic Hormone Receptor-Positive Breast Cancer

NCT01296555
View directory record Official record
Conditions
Solid Cancers, Non-Hodgkin's Lymphoma
Interventions
Fulvestrant, GDC-0032, Letrozole, Midazolam
Drug
Lead sponsor
Genentech, Inc.
Industry
Eligibility
18 Years and older
Enrollment
674 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2021
U.S. locations
27
States / cities
Scottsdale, Arizona • Tucson, Arizona • Orange, California + 20 more
Source: ClinicalTrials.gov public record
Updated Jul 31, 2024 · Synced Oct 23, 2026, 4:18 PM EDT
Terminated Phase 2 Interventional Results available

Letrozole Versus Observation in Patients With Newly Diagnosed Uterine Leiomyosarcoma

NCT00414076
View directory record Official record
Conditions
Leiomyosarcoma, Uterine Neoplasm
Interventions
Letrozole
Drug
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older · Female only
Enrollment
9 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2017
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Nov 20, 2018 · Synced Oct 23, 2026, 4:18 PM EDT
Completed Phase 2 Interventional Results available

Combination Chemotherapy and Filgrastim Before Surgery in Treating Patients With HER2-Positive Breast Cancer That Can Be Removed By Surgery

NCT00194779
View directory record Official record
Conditions
Estrogen Receptor-negative Breast Cancer, Estrogen Receptor-positive Breast Cancer, HER2-positive Breast Cancer, Progesterone Receptor-negative Breast Cancer, Progesterone Receptor-positive Breast Cancer, Stage IA Breast Cancer, Stage IB Breast Cancer, Stage II Breast Cancer, Stage IIIA Breast Cancer
Interventions
doxorubicin hydrochloride, cyclophosphamide, paclitaxel, filgrastim, capecitabine, methotrexate, vinorelbine tartrate, needle biopsy, therapeutic conventional surgery, immunohistochemistry staining method, trastuzumab, tamoxifen citrate, letrozole, laboratory biomarker analysis
Drug · Biological · Procedure + 1 more
Lead sponsor
University of Washington
Other
Eligibility
18 Years and older · Female only
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2011
U.S. locations
1
States / cities
Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Mar 12, 2018 · Synced Oct 23, 2026, 4:18 PM EDT