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Showing 1–24 of 334 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Letrozole Clear all
Not listed Phase 2 Interventional

Single Arm Trial With Combination of Everolimus and Letrozole in Treatment of Platinum Resistant Relapse or Refractory or Persistent Ovarian Cancer/Endometrial Cancer

NCT02188550
View directory record Official record
Conditions
Ovarian Cancer, Endometrial Cancer
Interventions
everolimus and letrozole
Drug
Lead sponsor
Sinai Hospital of Baltimore
Other
Eligibility
18 Years to 80 Years · Female only
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2014
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated May 18, 2015 · Synced Sep 1, 2026, 2:46 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 29, 2017 · Synced Sep 1, 2026, 2:46 PM EDT
Active, not recruiting Not applicable Interventional

Myo-Inositol for Infertility in PCOS

NCT04407754
View directory record Official record
Conditions
Polycystic Ovary Syndrome
Interventions
Inositol supplement, Placebo supplement
Dietary Supplement
Lead sponsor
University of Oklahoma
Other
Eligibility
18 Years to 36 Years
Enrollment
168 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2026
U.S. locations
1
States / cities
Oklahoma City, Oklahoma
Source: ClinicalTrials.gov public record
Updated May 11, 2026 · Synced Sep 1, 2026, 2:46 PM EDT
Completed No phase listed Observational Results available

Real-world Treatment Patterns and Effectiveness of Palbociclib and AI Therapy

NCT04176354
View directory record Official record
Conditions
Metastatic Breast Cancer
Interventions
Palbociclib + an aromatase inhibitor, Palbociclib + Letrozole, Letrozole
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years and older · Female only
Enrollment
813 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Aug 22, 2024 · Synced Sep 1, 2026, 2:46 PM EDT
Completed No phase listed Observational Results available

Study to Compare Overall Survival in Medicare Patients With Metastatic Breast Cancer Treated With a Medicine Called Palbociclib in Combination With Aromatase Inhibitor and Aromatase Inhibitor by Itself.

NCT06086340
View directory record Official record
Conditions
Breast Cancer
Interventions
Palbociclib, Aromatase Inhibitor
Drug
Lead sponsor
Pfizer
Industry
Eligibility
65 Years and older
Enrollment
779 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2024
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Nov 17, 2025 · Synced Sep 1, 2026, 2:46 PM EDT
Completed Phase 2 Interventional Results available

Study of Breast Cancer Prevention by Letrozole in High Risk Women

NCT00579826
View directory record Official record
Conditions
Breast Cancer
Interventions
Letrozole, Placebo
Drug
Lead sponsor
Carol Fabian, MD
Other
Eligibility
30 Years to 69 Years · Female only
Enrollment
55 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2018
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Jun 11, 2023 · Synced Sep 1, 2026, 2:46 PM EDT
Completed Phase 2 Interventional Results available

Everolimus Combined With Anti-estrogen Therapy in Hormone-Receptor-Positive HER-2 Negative Advanced Breast Cancer

NCT02291913
View directory record Official record
Conditions
Breast Cancer
Interventions
Everolimus, Exemestane, Tamoxifen, Fulvestrant, Anastrozole, Letrozole, Toremifine
Drug
Lead sponsor
SCRI Development Innovations, LLC
Other
Eligibility
18 Years and older · Female only
Enrollment
48 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2019
U.S. locations
8
States / cities
Fort Myers, Florida • Hollywood, Florida • Pensacola, Florida + 5 more
Source: ClinicalTrials.gov public record
Updated Feb 16, 2020 · Synced Sep 1, 2026, 2:46 PM EDT
Completed Not applicable Interventional

Lifestyle Intervention Study in Adjuvant Treatment of Early Breast Cancer

NCT00463489
View directory record Official record
Conditions
Breast Cancer
Interventions
Lifestyle intervention, Mail-based
Behavioral
Lead sponsor
Ontario Clinical Oncology Group (OCOG)
Other
Eligibility
Female only
Enrollment
338 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2018
U.S. locations
4
States / cities
Torrance, California • Boston, Massachusetts • Seattle, Washington
Source: ClinicalTrials.gov public record
Updated Sep 25, 2018 · Synced Sep 1, 2026, 2:46 PM EDT
Completed Phase 2 Interventional Results available

Study of 2 Ribociclib Doses in Combination With Aromatase Inhibitors in Women With HR+, HER2- Advanced Breast Cancer

NCT03822468
View directory record Official record
Conditions
Breast Cancer
Interventions
Ribociclib, Anastrozole, Letrozole, Goserelin
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
18 Years to 100 Years · Female only
Enrollment
376 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2024
U.S. locations
14
States / cities
Mobile, Alabama • Greenbrae, California • Longmont, Colorado + 11 more
Source: ClinicalTrials.gov public record
Updated Oct 15, 2025 · Synced Sep 1, 2026, 2:46 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 2, 2016 · Synced Sep 1, 2026, 2:46 PM EDT
Completed Phase 2 Interventional Results available

Letrozole in Post-Menopausal Patients With Operable Hormone-Sensitive Breast Cancer

NCT03747042
View directory record Official record
Conditions
Breast Cancer Female
Interventions
Letrozole
Drug
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
18 Years and older · Female only
Enrollment
61 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2025
U.S. locations
1
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Mar 15, 2026 · Synced Sep 1, 2026, 2:46 PM EDT
Terminated No phase listed Observational

Analysis of Letrozole in Patients With Operable Hormone Receptor Positive, HER2 Negative Breast Cancer

NCT05447910
View directory record Official record
Conditions
Breast Adenocarcinoma, Invasive Breast Carcinoma, Resectable Breast Carcinoma
Interventions
Biospecimen Collection
Procedure
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years and older · Female only
Enrollment
21 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2023
U.S. locations
1
States / cities
Jacksonville, Florida
Source: ClinicalTrials.gov public record
Updated Jun 14, 2025 · Synced Sep 1, 2026, 2:46 PM EDT
Withdrawn Phase 4 Interventional Accepts healthy volunteers

Does Letrozole Improve the Outcomes and/or Reduce the Cost of IVF-ET Cycles?

NCT00804960
View directory record Official record
Conditions
Infertility
Interventions
Letrozole, Std IVF Protocol
Drug
Lead sponsor
Center for Human Reproduction
Other
Eligibility
21 Years to 38 Years · Female only
Healthy volunteers
Accepts healthy volunteers
Timeline
2008 – 2010
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Jun 24, 2015 · Synced Sep 1, 2026, 2:46 PM EDT
Completed Phase 3 Interventional Results available

Study Comparing Lapatinib (GW572016) And Letrozole Versus Letrozole In Subjects With Advanced Or Metastatic Breast Cancer

NCT00073528
View directory record Official record
Conditions
Breast Neoplasms
Interventions
Lapatinib, Letrozole, Placebo
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
18 Years and older · Female only
Enrollment
1,286 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2018
U.S. locations
84
States / cities
Tucson, Arizona • Hot Springs, Arkansas • Jonesboro, Arkansas + 78 more
Source: ClinicalTrials.gov public record
Updated Feb 23, 2021 · Synced Sep 1, 2026, 2:46 PM EDT
Terminated Phase 1 Interventional

Copanlisib, Letrozole, and Palbociclib in Treating Patients With Hormone Receptor Positive HER2 Negative Stage I-IV Breast Cancer

NCT03128619
View directory record Official record
Conditions
Estrogen Receptor Positive, HER2/Neu Negative, Invasive Breast Carcinoma, Multifocal Breast Carcinoma, Postmenopausal, Progesterone Receptor Positive, Stage I Breast Cancer, Stage IA Breast Cancer, Stage IB Breast Cancer, Stage II Breast Cancer, Stage IIA Breast Cancer, Stage IIB Breast Cancer, Stage III Breast Cancer, Stage IIIA Breast Cancer, Stage IIIB Breast Cancer, Stage IIIC Breast Cancer, Stage IV Breast Cancer
Interventions
Biopsy of Breast, Copanlisib, Laboratory Biomarker Analysis, Letrozole, Palbociclib, Pharmacological Study
Procedure · Drug · Other
Lead sponsor
Jonsson Comprehensive Cancer Center
Other
Eligibility
19 Years and older
Enrollment
10 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2022
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated Sep 25, 2022 · Synced Sep 1, 2026, 2:46 PM EDT
Withdrawn Phase 1 Interventional

Neoadjuvant Run-In Study With TAK-228 Followed by Letrozole/TAK-228 in Women With High-Risk ER+/HER2- Breast Cancer

NCT02619669
View directory record Official record
Conditions
Breast Cancer
Interventions
TAK-228, Letrozole
Drug
Lead sponsor
Gary Schwartz
Other
Eligibility
18 Years and older · Female only
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
1
States / cities
Lebanon, New Hampshire
Source: ClinicalTrials.gov public record
Updated Mar 11, 2020 · Synced Sep 1, 2026, 2:46 PM EDT
Recruiting Phase 3 Interventional

De-Escalation of Breast Radiation Trial for Hormone Sensitive, HER-2 Negative, Oncotype Recurrence Score Less Than or Equal to 18 Breast Cancer (DEBRA)

NCT04852887
View directory record Official record
Conditions
Stage I Breast Cancer
Interventions
Radiation and Endocrine Therapy (Tamoxifen, Anastrozol, Letrozole, Exemestane), Endocrine Therapy (Tamoxifen, Anastrozol, Letrozole, Exemestane)
Other · Drug
Lead sponsor
NRG Oncology
Other
Eligibility
50 Years to 70 Years
Enrollment
1,670 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2041
U.S. locations
812
States / cities
Birmingham, Alabama • Mobile, Alabama • Kingman, Arizona + 553 more
Source: ClinicalTrials.gov public record
Updated Apr 22, 2026 · Synced Sep 1, 2026, 2:46 PM EDT
Completed Phase 2 Interventional Results available

Protocol for Women at Increased Risk of Developing Breast Cancer

NCT00291135
View directory record Official record
Conditions
Breast Cancer
Interventions
letrozole
Drug
Lead sponsor
Carol Fabian, MD
Other
Eligibility
18 Years and older · Female only
Enrollment
42 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2008
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Jun 14, 2016 · Synced Sep 1, 2026, 2:46 PM EDT
Recruiting Phase 3 Interventional

Testing Whether Hormone Therapy With Ribociclib is as Effective as Chemotherapy Followed by Hormone Therapy With Ribociclib for the Treatment of High Anatomic Stage Breast Cancer With Low Recurrence Risk, The RxFINE-Low Trial

NCT07391774
View directory record Official record
Conditions
Anatomic Stage II Breast Cancer AJCC v8, Anatomic Stage IIIA Breast Cancer AJCC v8, Anatomic Stage IIIC Breast Cancer AJCC v8, Estrogen Receptor-Positive Breast Carcinoma, HER2-Negative Breast Carcinoma
Interventions
Anastrozole, Biospecimen Collection, Bone Scan, Chemotherapy, Computed Tomography, Exemestane, Letrozole, Oncotype DX Breast Cancer Assay, Positron Emission Tomography, Ribociclib Succinate
Drug · Procedure
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
18 Years and older
Enrollment
1,978 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2026 – 2029
U.S. locations
143
States / cities
Jonesboro, Arkansas • Auburn, California • Berkeley, California + 118 more
Source: ClinicalTrials.gov public record
Updated Aug 31, 2026 · Synced Sep 1, 2026, 2:46 PM EDT
Completed Phase 1 Interventional

Dose Escalation Study of LEE011 in Combination With Buparlisib and Letrozole in HR+, HER2-negative Post-menopausal Women With Advanced Breast Cancer.

NCT02154776
View directory record Official record
Conditions
Advanced or Metastatic Breast Cancer
Interventions
LEE011, Buparlisib, Letrozole
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
18 Years and older · Female only
Enrollment
13 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2016
U.S. locations
5
States / cities
Los Angeles, California • Lafayette, Indiana • Charleston, South Carolina + 2 more
Source: ClinicalTrials.gov public record
Updated Dec 18, 2020 · Synced Sep 1, 2026, 2:46 PM EDT
Recruiting Phase 1Phase 2 Interventional

Study of AVZO-021 in Patients With Advanced Solid Tumors

NCT05867251
View directory record Official record
Conditions
Advanced Solid Tumor, HR+/HER2- Breast Cancer, HR+, HER2-, Advanced Breast Cancer, CCNE1 Amplification, Epithelial Ovarian Cancer, Primary Peritoneal Cancer, Fallopian Tube Cancer, Endometrial Cancer, TNBC - Triple-Negative Breast Cancer
Interventions
AVZO-021, Palbociclib, Fulvestrant, Letrozole, Ribociclib, Abemaciclib, Carboplatin, Sacituzumab Govitecan-hziy
Drug
Lead sponsor
Avenzo Therapeutics, Inc.
Industry
Eligibility
18 Years and older
Enrollment
430 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2030
U.S. locations
11
States / cities
New Haven, Connecticut • Sarasota, Florida • Tampa, Florida + 8 more
Source: ClinicalTrials.gov public record
Updated Nov 18, 2025 · Synced Sep 1, 2026, 2:46 PM EDT
Completed No phase listed Observational

Effect of Aromatase Inhibitor Therapy on Blood Vessel Function in Postmenopausal Women With Breast Cancer

NCT00719966
View directory record Official record
Conditions
Breast Cancer
Interventions
anastrozole, exemestane, letrozole, assessment of therapy complications
Drug · Procedure
Lead sponsor
Mayo Clinic
Other
Eligibility
40 Years to 80 Years · Female only
Enrollment
109 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2020
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Jan 1, 2024 · Synced Sep 1, 2026, 2:46 PM EDT
Active, not recruiting Phase 2 Interventional Results available

Pre-Operative Window of Adjuvant Endocrine Therapy to Inform RT Decisions in Older Women With Early-Stage Breast Cancer

NCT04272801
View directory record Official record
Conditions
Breast Cancer Female
Interventions
tamoxifen, letrozole, anastrozole, or exemestane, Patient reported outcomes
Drug · Behavioral
Lead sponsor
Shayna Showalter, MD
Other
Eligibility
65 Years and older · Female only
Enrollment
84 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2026
U.S. locations
2
States / cities
Charlottesville, Virginia • Richmond, Virginia
Source: ClinicalTrials.gov public record
Updated Oct 21, 2025 · Synced Sep 1, 2026, 2:46 PM EDT
Completed Phase 2 Interventional

Everolimus and Letrozole as Preoperative Therapy of Primary Breast Cancer in Post-menopausal Women

NCT00107016
View directory record Official record
Conditions
Breast Neoplasm
Interventions
RAD001, Letrozole 2.5mg, Letrozole 2.5mg
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
18 Years and older · Female only
Enrollment
267 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2007
U.S. locations
10
States / cities
Springdale, Arkansas • Long Beach, California • San Francisco, California + 7 more
Source: ClinicalTrials.gov public record
Updated Mar 3, 2013 · Synced Sep 1, 2026, 2:46 PM EDT