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ClinicalTrials.gov public records Last synced Sep 1, 2026, 10:28 PM EDT

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Showing 1–24 of 72 matching trials from the live ClinicalTrials.gov search.
Local D1 index available.
Filters: Intervention: Letrozole tablets Clear all
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, 10:28 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, 10:28 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, 10:28 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, 10:28 PM EDT
Completed Phase 2 Interventional Results available

Letrozole in Preventing Breast Cancer in Postmenopausal Women

NCT00090857
View directory record Official record
Conditions
Breast Cancer
Interventions
Letrozole, Placebo
Drug · Other
Lead sponsor
Dana-Farber Cancer Institute
Other
Eligibility
35 Years to 120 Years · Female only
Enrollment
49 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2013
U.S. locations
5
States / cities
Boston, Massachusetts • Philadelphia, Pennsylvania • Houston, Texas
Source: ClinicalTrials.gov public record
Updated Mar 29, 2018 · Synced Sep 1, 2026, 10:28 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Bioequivalency Study of Letrozole 2.5 mg Tablets Under Fasted Conditions

NCT01367652
View directory record Official record
Conditions
Breast Cancer
Interventions
Letrozole
Drug
Lead sponsor
Roxane Laboratories
Industry
Eligibility
18 Years to 45 Years · Male only
Enrollment
28 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2008
U.S. locations
1
States / cities
Fargo, North Dakota
Source: ClinicalTrials.gov public record
Updated Jan 22, 2018 · Synced Sep 1, 2026, 10:28 PM EDT
Recruiting Phase 2 Interventional

A Study of Alisertib in Combination With Endocrine Therapy in Patients With HR-positive, HER2-negative Recurrent or Metastatic Breast Cancer

NCT06369285
View directory record Official record
Conditions
Hormone Receptor Positive HER-2 Negative Breast Cancer, Metastatic Breast Cancer, Recurrent Breast Cancer
Interventions
Alisertib, Endocrine therapy
Drug
Lead sponsor
Puma Biotechnology, Inc.
Industry
Eligibility
18 Years and older
Enrollment
225 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2029
U.S. locations
35
States / cities
Birmingham, Alabama • Phoenix, Arizona • Beverly Hills, California + 28 more
Source: ClinicalTrials.gov public record
Updated Jul 26, 2026 · Synced Sep 1, 2026, 10:28 PM EDT
Completed Phase 2 Interventional Results available

Letrozole in Treating Postmenopausal Women With Ductal Carcinoma in Situ

NCT01439711
View directory record Official record
Conditions
Breast Cancer
Interventions
letrozole, MRI, conventional surgery
Drug · Procedure
Lead sponsor
Alliance for Clinical Trials in Oncology
Other
Eligibility
18 Years and older · Female only
Enrollment
108 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2018
U.S. locations
32
States / cities
Los Angeles, California • Oakland, California • San Francisco, California + 22 more
Source: ClinicalTrials.gov public record
Updated Mar 26, 2018 · Synced Sep 1, 2026, 10:28 PM EDT
Completed Phase 2 Interventional Results available

A Phase II Study of Everolimus in Combination With Exemestane Versus Everolimus Alone Versus Capecitabine in Advance Breast Cancer.

NCT01783444
View directory record Official record
Conditions
Breast Cancer
Interventions
Capecitabine, Exemestane, Everolimus
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
18 Years and older · Female only
Enrollment
309 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2018
U.S. locations
19
States / cities
Los Angeles, California • San Diego, California • Fort Myers, Florida + 15 more
Source: ClinicalTrials.gov public record
Updated Feb 25, 2021 · Synced Sep 1, 2026, 10:28 PM EDT
Enrolling by invitation Phase 3 Interventional

Safety Extension Study for Subjects With HR+, HER2- Breast Cancer for Subjects Who Have Completed the OVELIA Study

NCT05645536
View directory record Official record
Conditions
Breast Cancer
Interventions
TOL2506, Tamoxifen, Letrozole tablets, Anastrozole Tablets, Exemestane Tablets
Drug
Lead sponsor
Tolmar Inc.
Industry
Eligibility
18 Years to 51 Years
Enrollment
250 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2030
U.S. locations
17
States / cities
Greenbrae, California • Fort Lauderdale, Florida • Lexington, Kentucky + 14 more
Source: ClinicalTrials.gov public record
Updated Aug 31, 2026 · Synced Sep 1, 2026, 10:28 PM EDT
Completed Phase 2Phase 3 Interventional

Vaginal Progesterone Supplementation in Women With PCOS Undergoing Ovulation Induction With Letrozole

NCT03440359
View directory record Official record
Conditions
Polycystic Ovary Syndrome
Interventions
Progesterone Vaginal Gel 8%, Letrozole Oral Tablet, pelvic ultrasound, Ovidrel 250 MCG Per 0.5 ML Prefilled Syringe, Intrauterine insemination or timed intercourse
Drug · Diagnostic Test · Other
Lead sponsor
Eastern Virginia Medical School
Other
Eligibility
20 Years to 40 Years · Female only
Enrollment
52 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2017
U.S. locations
1
States / cities
Norfolk, Virginia
Source: ClinicalTrials.gov public record
Updated Feb 25, 2018 · Synced Sep 1, 2026, 10:28 PM EDT
Completed Phase 4 Interventional Results available

Rheumatological Evaluation of Anastrozole and Letrozole as Adjuvant Treatment in Post-menopausal Women With Breast Cancer

NCT00688909
View directory record Official record
Conditions
Breast Cancer
Interventions
letrozole
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
50 Years and older · Female only
Enrollment
261 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2009
U.S. locations
48
States / cities
Huntsville, Alabama • Little Rock, Arkansas • Grass Valley, California + 43 more
Source: ClinicalTrials.gov public record
Updated Jun 8, 2021 · Synced Sep 1, 2026, 10:28 PM EDT
Completed Phase 3 Interventional Results available

Study of Efficacy and Safety in Premenopausal Women With Hormone Receptor Positive, HER2-negative Advanced Breast Cancer

NCT02278120
View directory record Official record
Conditions
Advanced Metastatic Breast Cancer
Interventions
Ribociclib, Tamoxifen, Letrozole, Anastrozole, Goserelin, Placebo
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
18 Years to 59 Years · Female only
Enrollment
672 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2023
U.S. locations
35
States / cities
Bakersfield, California • Los Angeles, California • Denver, Colorado + 29 more
Source: ClinicalTrials.gov public record
Updated Mar 11, 2024 · Synced Sep 1, 2026, 10:28 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 10, 2025 · Synced Sep 1, 2026, 10:28 PM EDT
Completed Phase 2 Interventional Results available

Study Of Letrozole With Or Without Palbociclib (PD-0332991) For The First-Line Treatment Of Hormone-Receptor Positive Advanced Breast Cancer

NCT00721409
View directory record Official record
Conditions
Breast Cancer
Interventions
PD 0332991, letrozole
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years and older · Female only
Enrollment
177 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2017
U.S. locations
51
States / cities
Alhambra, California • Bakersfield, California • Fullerton, California + 24 more
Source: ClinicalTrials.gov public record
Updated Nov 3, 2019 · Synced Sep 1, 2026, 10:28 PM EDT
Completed Phase 2 Interventional

Impact of Endocrine Therapy and Abemaciclib on Host and Tumor Immune Cell Repertoire/Function in Advanced ER+/HER2- Breast Cancer

NCT04352777
View directory record Official record
Conditions
Metastatic Breast Cancer, Locally Advanced Breast Cancer, Hormone Receptor Positive Tumor
Interventions
Abemaciclib, Fulvestrant, Aromatase Inhibitors
Drug
Lead sponsor
Duke University
Other
Eligibility
18 Years and older · Female only
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2025
U.S. locations
1
States / cities
Durham, North Carolina
Source: ClinicalTrials.gov public record
Updated Jul 19, 2025 · Synced Sep 1, 2026, 10:28 PM EDT
Completed Phase 2 Interventional Results available

A Study of Abiraterone Acetate Plus Prednisone With or Without Exemestane in Postmenopausal Women With Estrogen Receptor-Positive (ER+) Metastatic Breast Cancer Progressing After Letrozole or Anastrozole Therapy

NCT01381874
View directory record Official record
Conditions
Metastatic ER+ Her2- Breast Cancer, Postmenopausal
Interventions
Exemestane, Abiraterone acetate + Prednisone/ Prednisolone + Exemestane, Abiraterone acetate + Prednisone or Prednisolone
Drug
Lead sponsor
Janssen Research & Development, LLC
Industry
Eligibility
18 Years and older · Female only
Enrollment
297 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2018
U.S. locations
24
States / cities
Muscle Shoals, Alabama • Fresno, California • Los Angeles, California + 21 more
Source: ClinicalTrials.gov public record
Updated Apr 10, 2019 · Synced Sep 1, 2026, 10:28 PM EDT
Terminated Phase 2 Interventional Results available

Phase 2 Window Study of SAR439859 (Amcenestrant) Versus Letrozole in Post-menopausal Patients With ER+, HER2- Pre-operative Post-menopausal Primary Breast Cancer

NCT04191382
View directory record Official record
Conditions
Breast Cancer
Interventions
Amcenestrant (SAR439859), Letrozole
Drug
Lead sponsor
Sanofi
Industry
Eligibility
18 Years and older · Female only
Enrollment
105 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2021
U.S. locations
6
States / cities
Tucson, Arizona • Los Angeles, California • Fort Wayne, Indiana + 3 more
Source: ClinicalTrials.gov public record
Updated Sep 17, 2025 · Synced Sep 1, 2026, 10:28 PM EDT
Recruiting Early Phase 1 Interventional

Study of Letrozole in Recurrent Gliomas

NCT03122197
View directory record Official record
Conditions
Brain Tumor
Interventions
Letrozole Oral Tablet, Temozolomide
Drug
Lead sponsor
University of Cincinnati
Other
Eligibility
18 Years and older
Enrollment
39 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2027
U.S. locations
1
States / cities
Cincinnati, Ohio
Source: ClinicalTrials.gov public record
Updated Aug 17, 2026 · Synced Sep 1, 2026, 10:28 PM EDT
Active, not recruiting Phase 3 Interventional

Phase III Study to Assess AZD9833+ CDK4/6 Inhibitor in HR+/HER2-MBC With Detectable ESR1m Before Progression (SERENA-6)

NCT04964934
View directory record Official record
Conditions
ER-Positive HER2-Negative Breast Cancer
Interventions
AZD9833, AZD9833 Placebo, Anastrozole, Anastrozole placebo, Letrozole, Letrozole placebo, Palbociclib, Abemaciclib, Luteinizing hormone-releasing hormone (LHRH) agonist, Ribociclib
Drug
Lead sponsor
AstraZeneca
Industry
Eligibility
18 Years to 130 Years
Enrollment
315 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2028
U.S. locations
64
States / cities
Phoenix, Arizona • Hot Springs, Arkansas • Little Rock, Arkansas + 56 more
Source: ClinicalTrials.gov public record
Updated Jul 13, 2026 · Synced Sep 1, 2026, 10:28 PM EDT
Completed Phase 3 Interventional Results available

Study of Efficacy and Safety of LEE011 in Postmenopausal Women With Advanced Breast Cancer

NCT01958021
View directory record Official record
Conditions
Advanced, Metastatic Breast Cancer
Interventions
Ribociclib, Letrozole, Placebo
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
18 Years to 100 Years · Female only
Enrollment
668 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2023
U.S. locations
73
States / cities
Chandler, Arizona • Sedona, Arizona • Fayetteville, Arkansas + 62 more
Source: ClinicalTrials.gov public record
Updated Mar 6, 2025 · Synced Sep 1, 2026, 10:28 PM EDT
Recruiting Phase 1 Interventional

BGB-43395 Alone or as Part of Combination Therapies in Participants With Breast Cancer and Other Advanced Solid Tumors

NCT06120283
View directory record Official record
Conditions
Advanced Solid Tumor, Advanced Breast Cancer, Metastatic Breast Cancer, Hormone-receptor-positive Breast Cancer, Hormone Receptor Positive Breast Carcinoma, Hormone Receptor Positive Malignant Neoplasm of Breast, HER2-negative Breast Cancer, Hormone Receptor Positive HER-2 Negative Breast Cancer
Interventions
BGB-43395, Fulvestrant, Letrozole, Elacestrant, Anti-Diarrheal Agent
Drug
Lead sponsor
BeOne Medicines
Industry
Eligibility
18 Years and older
Enrollment
433 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2029
U.S. locations
10
States / cities
Denver, Colorado • Lake Mary, Florida • Detroit, Michigan + 7 more
Source: ClinicalTrials.gov public record
Updated Aug 27, 2026 · Synced Sep 1, 2026, 10:28 PM EDT
Terminated Phase 2 Interventional Results available

Evaluation of Biomarkers Associated With Response to Subsequent Therapies in Subjects With HER2-Positive Metastatic Breast Cancer

NCT02213042
View directory record Official record
Conditions
Neoplasms, Breast
Interventions
Lapatinib, Trastuzumab, Aromatase Inhibitors (AIs)
Drug · Biological
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
18 Years and older · Female only
Enrollment
42 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2020
U.S. locations
3
States / cities
Mobile, Alabama • Boston, Massachusetts • Houston, Texas
Source: ClinicalTrials.gov public record
Updated Oct 12, 2021 · Synced Sep 1, 2026, 10:28 PM EDT
Terminated Phase 2 Interventional Results available

Study Evaluating Bosutinib-Letrozole Combination Versus Letrozole Alone In Post Menopausal Women With Breast Cancer

NCT00880009
View directory record Official record
Conditions
Breast Cancer
Interventions
Bosutinib, Letrozole
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years and older · Female only
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
5
States / cities
Whittier, California • Joliet, Illinois • Niles, Illinois + 2 more
Source: ClinicalTrials.gov public record
Updated Sep 26, 2021 · Synced Sep 1, 2026, 10:28 PM EDT