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ClinicalTrials.gov public records Last synced Sep 9, 2026, 11:15 AM EDT

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Showing 25–48 of 24 matching trials from the live ClinicalTrials.gov search.
Local D1 index available.
Filters: Intervention: Letrozole tablets Clear all
Completed Phase 3 Interventional Results available

Comparison Trial of Letrozole to Anastrozole in the Adjuvant Treatment of Postmenopausal Women With Hormone Receptor and Node Positive Breast Cancer

NCT00248170
View directory record Official record
Conditions
Breast Cancer
Interventions
Letrozole, Anastrozole
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
33 Years to 96 Years · Female only
Enrollment
4,172 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2014
U.S. locations
42
States / cities
Birmingham, Alabama • Huntsville, Alabama • Flagstaff, Arizona + 35 more
Source: ClinicalTrials.gov public record
Updated Apr 18, 2016 · Synced Sep 9, 2026, 11:15 AM EDT
Recruiting Phase 3 Interventional

A Study of Elacestrant Versus Standard Endocrine Therapy in Women and Men With ER+,HER2-, Early Breast Cancer With High Risk of Recurrence

NCT06492616
View directory record Official record
Conditions
Breast Cancer
Interventions
Elacestrant, Anastrozole, Letrozole, Exemestane, Tamoxifen
Drug
Lead sponsor
Stemline Therapeutics, Inc.
Industry
Eligibility
18 Years and older
Enrollment
4,220 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2032
U.S. locations
174
States / cities
Daphne, Alabama • Chandler, Arizona • Gilbert, Arizona + 137 more
Source: ClinicalTrials.gov public record
Updated Aug 16, 2026 · Synced Sep 9, 2026, 11:15 AM 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 9, 2026, 11:15 AM 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 9, 2026, 11:15 AM EDT
Active, not recruiting Phase 3 Interventional

Ovarian Suppression Evaluating Subcutaneous Leuprolide Acetate in Breast Cancer

NCT04906395
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 49 Years
Enrollment
250 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2026
U.S. locations
17
States / cities
Greenbrae, California • Parker, Colorado • Chicago, Illinois + 14 more
Source: ClinicalTrials.gov public record
Updated Jan 12, 2026 · Synced Sep 9, 2026, 11:15 AM 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 9, 2026, 11:15 AM EDT
Completed Phase 2 Interventional Results available

Adjuvant Ribociclib With Endocrine Therapy in Hormone Receptor+/HER2- High Risk Early Breast Cancer

NCT03078751
View directory record Official record
Conditions
Breast Cancer
Interventions
Ribociclib, Adjuvant endocrine therapy, Placebo
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
18 Years and older
Enrollment
54 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
33
States / cities
Tucson, Arizona • Fayetteville, Arkansas • Bakersfield, California + 28 more
Source: ClinicalTrials.gov public record
Updated Oct 10, 2021 · Synced Sep 9, 2026, 11:15 AM EDT
Active, not recruiting Phase 3 Interventional

Study of PF-07220060 With Letrozole in Adults With HR-positive HER2-negative Breast Cancer Who Have Not Received Anticancer Treatment for Advanced/Metastatic Disease

NCT06760637
View directory record Official record
Conditions
Breast Cancer
Interventions
PF-07220060, letrozole, abemaciclib, palbociclib, ribociclib
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years and older
Enrollment
1,035 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2037
U.S. locations
218
States / cities
Birmingham, Alabama • Chandler, Arizona • Gilbert, Arizona + 135 more
Source: ClinicalTrials.gov public record
Updated May 18, 2026 · Synced Sep 9, 2026, 11:15 AM 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 9, 2026, 11:15 AM EDT
Completed Phase 2 Interventional Results available

A Phase II, Single-Arm Study of RAD001 (Everolimus), Letrozole, and Metformin in Patients With Advanced or Recurrent Endometrial Carcinoma

NCT01797523
View directory record Official record
Conditions
Endometrial Cancer
Interventions
Metformin, Letrozole, Everolimus
Drug
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older
Enrollment
62 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2026
U.S. locations
6
States / cities
Pensacola, Florida • Voorhees Township, New Jersey • Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jul 29, 2026 · Synced Sep 9, 2026, 11:15 AM EDT
Completed Phase 2 Interventional Results available

A Study to Learn About the Study Medicine PF-07220060 Together With Letrozole Compared to Letrozole Alone in Women Post Menopause

NCT06465368
View directory record Official record
Conditions
Breast Cancer
Interventions
PF-07220060, letrozole
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years and older · Female only
Enrollment
121 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2025
U.S. locations
10
States / cities
Barrington, Illinois • Crystal Lake, Illinois • Park Ridge, Illinois + 2 more
Source: ClinicalTrials.gov public record
Updated Jul 14, 2026 · Synced Sep 9, 2026, 11:15 AM EDT
Not listed Phase 2 Interventional

NEOADjuvant Aromatase Inhibitor and Pertuzumab/Trastuzumab for Women With Breast Cancer

NCT02689921
View directory record Official record
Conditions
Breast Neoplasms
Interventions
Exemestane, Letrozole, Anastrozole, Leuprolide Acetate, Pertuzumab, Trastuzumab
Drug
Lead sponsor
Midwestern Regional Medical Center
Other
Eligibility
18 Years and older
Enrollment
7 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2018
U.S. locations
2
States / cities
Newnan, Georgia • Zion, Illinois
Source: ClinicalTrials.gov public record
Updated Sep 27, 2018 · Synced Sep 9, 2026, 11:15 AM 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 9, 2026, 11:15 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Bioequivalency Study of Letrozole 2.5 mg Tablets Under Fed Conditions

NCT01367626
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 9, 2026, 11:15 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 9, 2026, 11:15 AM EDT
Recruiting Phase 1 Interventional

A Study With NKT5097 for Adults With Advanced/Metastatic Solid Tumors

NCT07029399
View directory record Official record
Conditions
HR+ Breast Cancer, Triple Negative Breast Cancer (TNBC), CCNE1 Amplified Advanced Solid Tumors, HR+ HER2- Breast Cancer
Interventions
NKT5097 CDK2/CDK4 dual degrader, Fulvestrant, Letrozole
Drug
Lead sponsor
NiKang Therapeutics, Inc.
Industry
Eligibility
18 Years and older
Enrollment
361 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
18
States / cities
Duarte, California • La Jolla, California • Denver, Colorado + 15 more
Source: ClinicalTrials.gov public record
Updated Aug 27, 2026 · Synced Sep 9, 2026, 11:15 AM EDT
Completed Phase 2 Interventional Results available

Letrozole for Lymphangioleiomyomatosis

NCT01353209
View directory record Official record
Conditions
Lymphangioleiomyomatosis
Interventions
Letrozole, Placebo
Drug
Lead sponsor
University of Cincinnati
Other
Eligibility
18 Years and older · Female only
Enrollment
17 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2014
U.S. locations
9
States / cities
Stanford, California • Jacksonville, Florida • Miami, Florida + 6 more
Source: ClinicalTrials.gov public record
Updated Apr 16, 2024 · Synced Sep 9, 2026, 11:15 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 9, 2026, 11:15 AM EDT
Completed Phase 2 Interventional Accepts healthy volunteers Results available

Assessment and Prevention of Pain During Ovarian Stimulation in Patients With Endometriosis

NCT04002141
View directory record Official record
Conditions
Endometriosis, Ovarian Hyperstimulation
Interventions
Placebo oral tablet, Letrozole
Drug
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years to 42 Years · Female only
Enrollment
60 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2019 – 2025
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Jan 27, 2026 · Synced Sep 9, 2026, 11:15 AM 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 9, 2026, 11:15 AM 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 9, 2026, 11:15 AM EDT
Not listed Phase 1Phase 2 Interventional

Study of Narazaciclib (ON 123300) Plus Letrozole in Endometrial Cancer and Other Gynecologic Malignancies

NCT05705505
View directory record Official record
Conditions
Endometrioid Endometrial Cancer
Interventions
Narazaciclib, Letrozole 2.5mg
Drug
Lead sponsor
Traws Pharma, Inc.
Industry
Eligibility
18 Years and older · Female only
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2026
U.S. locations
8
States / cities
Tucson, Arizona • Minneapolis, Minnesota • Mineola, New York + 5 more
Source: ClinicalTrials.gov public record
Updated Dec 11, 2023 · Synced Sep 9, 2026, 11:15 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Food Study of Letrozole Tablets 2.5 mg and Femara® Tablets 2.5 mg

NCT00648154
View directory record Official record
Conditions
Healthy
Interventions
Letrozole Tablets 2.5 mg, Femara® Tablets 2.5 mg
Drug
Lead sponsor
Mylan Pharmaceuticals Inc
Industry
Eligibility
40 Years and older · Female only
Enrollment
24 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2005 – 2006
U.S. locations
1
States / cities
Miami, Florida
Source: ClinicalTrials.gov public record
Updated Nov 30, 2009 · Synced Sep 9, 2026, 11:15 AM EDT
Completed Phase 2 Interventional Results available

Study Assessing the Efficacy and Safety of Alpelisib Plus Fulvestrant or Letrozole, Based on Prior Endocrine Therapy, in Patients With PIK3CA Mutant, HR+, HER2- Advanced Breast Cancer Who Have Progressed on or After Prior Treatments

NCT03056755
View directory record Official record
Conditions
Breast Cancer
Interventions
Alpelisib, Fulvestrant, Letrozole, Goserelin, Leuprolide
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
18 Years to 99 Years
Enrollment
383 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2024
U.S. locations
25
States / cities
Gilbert, Arizona • Phoenix, Arizona • Anaheim, California + 20 more
Source: ClinicalTrials.gov public record
Updated Jan 12, 2026 · Synced Sep 9, 2026, 11:15 AM EDT