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Showing 1–24 of 72 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Letrozole Tablets Clear all
Recruiting Phase 3 Interventional

A Study to Evaluate the Efficacy and Safety of Inavolisib in Combination With Phesgo Versus Placebo in Combination With Phesgo in Participants With PIK3CA-Mutated HER2-Positive Locally Advanced or Metastatic Breast Cancer

NCT05894239
View directory record Official record
Conditions
Metastatic Breast Cancer
Interventions
Inavolisib, Phesgo, Placebo, Taxane-based Chemotherapy, Optional Endocrine Therapy of Investigator's Choice
Drug
Lead sponsor
Hoffmann-La Roche
Industry
Eligibility
18 Years and older
Enrollment
230 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2032
U.S. locations
20
States / cities
Gilbert, Arizona • Burbank, California • Corona, California + 17 more
Source: ClinicalTrials.gov public record
Updated Aug 24, 2026 · Synced Sep 9, 2026, 9:22 PM EDT
Completed Phase 1Phase 2 Interventional Results available

Open Label Treatment Extension Study With SAR245408 or SAR245409 as a Monotherapy or as a Combination Regimen

NCT01587040
View directory record Official record
Conditions
Neoplasm Malignant
Interventions
SAR245408, SAR245409
Drug
Lead sponsor
Sanofi
Industry
Eligibility
Not listed
Enrollment
61 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2018
U.S. locations
16
States / cities
Birmingham, Alabama • Los Angeles, California • Denver, Colorado + 12 more
Source: ClinicalTrials.gov public record
Updated Apr 18, 2022 · Synced Sep 9, 2026, 9:22 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 9, 2026, 9:22 PM EDT
Completed Early Phase 1 Interventional Accepts healthy volunteers

Evaluating the Pharmacokinetics and Drug Interaction Potential of the Botanical Dietary Supplement Cinnamon

NCT05157672
View directory record Official record
Conditions
Interaction Drug Food
Interventions
Cinnamon (2 g), Nicotine gum (2.5 mg), Letrozole (2.5 mg)
Dietary Supplement · Drug
Lead sponsor
Washington State University
Other
Eligibility
18 Years to 64 Years
Enrollment
16 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2021 – 2024
U.S. locations
1
States / cities
Spokane, Washington
Source: ClinicalTrials.gov public record
Updated Aug 23, 2026 · Synced Sep 9, 2026, 9:22 PM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

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

NCT00648063
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, 9:22 PM EDT
Completed Phase 2 Interventional

Letrozole, Herceptin in Her2neu +, Estrogen Receptor [ER] and/or Progesterone Receptor [PR] Positive, MBC

NCT00134680
View directory record Official record
Conditions
Metastatic Breast Cancer
Interventions
Letrozole, Trastuzumab
Drug
Lead sponsor
Duke University
Other
Eligibility
18 Years and older · Female only
Enrollment
33 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2000 – 2005
U.S. locations
4
States / cities
Washington D.C., District of Columbia • Boston, Massachusetts • St Louis, Missouri + 1 more
Source: ClinicalTrials.gov public record
Updated Sep 15, 2014 · Synced Sep 9, 2026, 9:22 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 9, 2026, 9:22 PM EDT
Terminated Phase 2 Interventional Results available

Phase 2 Study of Amcenestrant (SAR439859) Versus Physician's Choice in Locally Advanced or Metastatic ER-positive Breast Cancer

NCT04059484
View directory record Official record
Conditions
Breast Cancer Metastatic
Interventions
Amcenestrant, Fulvestrant, Anastrozole, Letrozole, Exemestane, Tamoxifen
Drug
Lead sponsor
Sanofi
Industry
Eligibility
18 Years and older
Enrollment
367 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2025
U.S. locations
14
States / cities
Birmingham, Alabama • Bakersfield, California • Santa Monica, California + 11 more
Source: ClinicalTrials.gov public record
Updated Feb 23, 2026 · Synced Sep 9, 2026, 9:22 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 19, 2018 · Synced Sep 9, 2026, 9:22 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 9, 2026, 9:22 PM EDT
Recruiting Phase 2 Interventional

A Study of MK-5684 in People With Certain Solid Tumors (MK-5684-015/OMAHA-015)

NCT06979596
View directory record Official record
Conditions
Malignant Neoplasm
Interventions
Opevesostat, Fludrocortisone/ Fludrocortisone acetate, Dexamethasone/Dexamethasone acetate, Rescue Medications, Fulvestrant, Exemestane, Megestrol acetate/Medroxyprogesterone acetate, Tamoxifen, Letrozole
Drug
Lead sponsor
Merck Sharp & Dohme LLC
Industry
Eligibility
18 Years and older
Enrollment
250 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
10
States / cities
Anchorage, Alaska • Miami Beach, Florida • Shreveport, Louisiana + 6 more
Source: ClinicalTrials.gov public record
Updated Aug 27, 2026 · Synced Sep 9, 2026, 9:22 PM EDT
Completed Phase 1 Interventional Results available

This Study in Patients With Different Types of Cancer (Solid Tumours) Aims to Find a Safe Dose of Xentuzumab in Combination With Abemaciclib With or Without Hormonal Therapies. The Study Also Tests How Effective These Medicines Are in Patients With Lung and Breast Cancer

NCT03099174
View directory record Official record
Conditions
Neoplasms, Breast Neoplasms
Interventions
Xentuzumab, Abemaciclib, Letrozole, Anastrozole, Fulvestrant
Drug
Lead sponsor
Boehringer Ingelheim
Industry
Eligibility
18 Years and older
Enrollment
133 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2024
U.S. locations
6
States / cities
Santa Monica, California • New Haven, Connecticut • Miami, Florida + 3 more
Source: ClinicalTrials.gov public record
Updated Jun 23, 2025 · Synced Sep 9, 2026, 9:22 PM EDT
Active, not recruiting Phase 4 Interventional Results available

Randomized Controlled Trial of Combined Letrozole and Clomid (CLC II) Versus Letrozole Alone for Women With Anovulation

NCT05206448
View directory record Official record
Conditions
Polycystic Ovary Syndrome, PCOS, Infertility
Interventions
Letrozole, Clomiphene Citrate
Drug
Lead sponsor
Rachel Mejia
Other
Eligibility
18 Years to 40 Years · Female only
Enrollment
190 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2025
U.S. locations
4
States / cities
Davenport, Iowa • Iowa City, Iowa • West Des Moines, Iowa + 1 more
Source: ClinicalTrials.gov public record
Updated Apr 14, 2025 · Synced Sep 9, 2026, 9:22 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 9, 2026, 9:22 PM EDT
Active, not recruiting Phase 2 Interventional Results available

TRADE: Dose Escalation Tolerability of Abemaciclib in HR+ HER2- Early Stage Breast Cancer

NCT06001762
View directory record Official record
Conditions
Breast Cancer, Early-stage Breast Cancer, High Risk Breast Carcinoma
Interventions
Abemaciclib, Tamoxifen, Anastrozole, Letrozole, Exemestane, LHRH Agonist
Drug
Lead sponsor
Dana-Farber Cancer Institute
Other
Eligibility
18 Years and older · Female only
Enrollment
90 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
12
States / cities
Stamford, Connecticut • Brewer, Maine • Scarborough, Maine + 7 more
Source: ClinicalTrials.gov public record
Updated Jul 1, 2026 · Synced Sep 9, 2026, 9:22 PM EDT
Terminated Phase 1 Interventional

Dehydroepiandrosterone (DHEA) and Letrozole in Treating Patients With Metastatic Breast Cancer

NCT00516542
View directory record Official record
Conditions
Breast Cancer
Interventions
letrozole, DHEA, pharmacological study
Drug · Other
Lead sponsor
OHSU Knight Cancer Institute
Other
Eligibility
60 Years and older
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2010
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Jul 23, 2012 · Synced Sep 9, 2026, 9:22 PM EDT
Completed Phase 2 Interventional Results available

Open-label, Phase II, Study of Everolimus Plus Letrozole in Postmenopausal Women With ER+, HER2- Metastatic or Locally Advanced Breast Cancer

NCT01698918
View directory record Official record
Conditions
Hormone Receptor Positive Breast Cancer
Interventions
Everolimus, Letrozole, Exemestane, Alcohol-free dexamethasone mouth rinse (Stomatitis sub-study), Standard of care to treat stomatitis (Stomatitis sub-study)
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
18 Years and older · Female only
Enrollment
202 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2021
U.S. locations
15
States / cities
Birmingham, Alabama • Gilbert, Arizona • Loma Linda, California + 12 more
Source: ClinicalTrials.gov public record
Updated May 2, 2023 · Synced Sep 9, 2026, 9:22 PM EDT
Completed Phase 3 Interventional Results available

Letrozole in Preventing Cancer in Postmenopausal Women Who Have Received 4-6 Years of Hormone Therapy for Hormone Receptor-Positive, Lymph Node-Positive, Early-Stage Breast Cancer

NCT00553410
View directory record Official record
Conditions
Breast Cancer
Interventions
Letrozole
Drug
Lead sponsor
ETOP IBCSG Partners Foundation
Network
Eligibility
18 Years to 120 Years · Female only
Enrollment
4,884 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2019
U.S. locations
2
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Aug 31, 2026 · Synced Sep 9, 2026, 9:22 PM EDT
Recruiting Phase 2 Interventional

Single Cell Immune and Non-immune Correlates of Response to Neoadjuvant Abemaciclib

NCT04614194
View directory record Official record
Conditions
Breast Cancer
Interventions
Letrozole, Abemaciclib
Drug
Lead sponsor
University of Texas Southwestern Medical Center
Other
Eligibility
18 Years and older · Female only
Enrollment
60 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2028
U.S. locations
2
States / cities
Dallas, Texas
Source: ClinicalTrials.gov public record
Updated Jun 16, 2026 · Synced Sep 9, 2026, 9:22 PM EDT
Terminated Phase 2 Interventional Results available

A Study of Lerociclib in Participants With Advanced Breast Cancer

NCT05085002
View directory record Official record
Conditions
Advanced Breast Cancer
Interventions
Lerociclib + Letrozole or Fulvestrant
Drug
Lead sponsor
EQRx, Inc.
Industry
Eligibility
18 Years and older
Enrollment
100 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2023
U.S. locations
6
States / cities
Jacksonville, Florida • Omaha, Nebraska • Salem, Oregon + 3 more
Source: ClinicalTrials.gov public record
Updated May 13, 2026 · Synced Sep 9, 2026, 9:22 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 9, 2026, 9:22 PM EDT
Completed Phase 2 Interventional Results available

Reversing Hormone Resistance in Advanced Breast Cancer With Pazopanib

NCT01466972
View directory record Official record
Conditions
Breast Cancer, Breast Neoplasm
Interventions
Pazopanib
Drug
Lead sponsor
Hope Rugo, MD
Other
Eligibility
18 Years and older · Female only
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2019
U.S. locations
1
States / cities
San Francisco, California
Source: ClinicalTrials.gov public record
Updated Jul 7, 2020 · Synced Sep 9, 2026, 9:22 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 9, 2026, 9:22 PM EDT
Completed Phase 2 Interventional

Efficacy and Safety of BMS-690514 in Combination With Letrozole to Treat Metastatic Breast Cancer

NCT01068704
View directory record Official record
Conditions
Breast Cancer
Interventions
BMS-690514, Lapatinib, Letrozole
Drug
Lead sponsor
Bristol-Myers Squibb
Industry
Eligibility
18 Years and older · Female only
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010
U.S. locations
4
States / cities
Abilene, Texas • Beaumont, Texas • Fort Worth, Texas + 1 more
Source: ClinicalTrials.gov public record
Updated Oct 11, 2015 · Synced Sep 9, 2026, 9:22 PM EDT