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ClinicalTrials.gov public records Last synced Sep 19, 2026, 3:57 PM EDT

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Showing 1–24 of 132 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: letrozole 2.5 mg Clear all
Completed Phase 1Phase 2 Interventional Results available

Tucatinib, Palbociclib and Letrozole in Metastatic Hormone Receptor Positive and HER2-positive Breast Cancer

NCT03054363
View directory record Official record
Conditions
Breast Cancer
Interventions
Tucatinib in Combination with Palbociclib and Letrozole
Drug
Lead sponsor
University of Colorado, Denver
Other
Eligibility
18 Years to 100 Years · Female only
Enrollment
42 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2023
U.S. locations
6
States / cities
Tucson, Arizona • Aurora, Colorado • Chicago, Illinois + 3 more
Source: ClinicalTrials.gov public record
Updated Nov 12, 2023 · Synced Sep 19, 2026, 3:57 PM EDT
Terminated Not applicable Interventional Results available

GCC 1366: Anti-Proliferative Response to NeoAdjuvant AIs in Overweight and Obese Patients

NCT02095184
View directory record Official record
Conditions
Breast Cancer
Interventions
Anastrozole, Letrozole
Drug
Lead sponsor
University of Maryland, Baltimore
Other
Eligibility
18 Years and older · Female only
Enrollment
42 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2024
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated Apr 14, 2026 · Synced Sep 19, 2026, 3:57 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 19, 2026, 3:57 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 19, 2026, 3:57 PM EDT
Terminated Phase 2 Interventional Results available

Letrozole in Patients With Ovarian Tumors

NCT00505661
View directory record Official record
Conditions
Ovarian Cancer, Fallopian Tube Cancer, Peritoneal Cancer
Interventions
Letrozole
Drug
Lead sponsor
M.D. Anderson Cancer Center
Other
Eligibility
18 Years and older · Female only
Enrollment
16 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2010
U.S. locations
1
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Apr 17, 2012 · Synced Sep 19, 2026, 3:57 PM EDT
Recruiting Phase 2 Interventional

Ribociclib And Endocrine Treatment of Physician's Choice for Locoregional Recurrent, Resected Hormone Receptor Positive HER2 Negative Breast Cancer

NCT05467891
View directory record Official record
Conditions
Locoregional Recurrence, Hormone Receptor-positive Breast Cancer, HER2-negative Breast Cancer
Interventions
Ribociclib, Fulvestrant, Anastrozole, Letrozole, Exemestane
Drug
Lead sponsor
Oana Danciu
Other
Eligibility
18 Years and older
Enrollment
200 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2029
U.S. locations
21
States / cities
Birmingham, Alabama • Phoenix, Arizona • Washington D.C., District of Columbia + 18 more
Source: ClinicalTrials.gov public record
Updated Jul 15, 2026 · Synced Sep 19, 2026, 3:57 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 19, 2026, 3:57 PM 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 19, 2026, 3:57 PM EDT
Completed Phase 2 Interventional Results available

Randomized Phase II Trial of Letrozole With or Without Dasatinib as First and Second-line Treatment for Hormone Receptor-positive, HER2-negative Post-menopausal Breast Cancer That is Unresectable, Locally Recurrent or Metastatic

NCT00696072
View directory record Official record
Conditions
Metastatic Breast Cancer
Interventions
Dasatinib, Letrozole
Drug
Lead sponsor
Bristol-Myers Squibb
Industry
Eligibility
18 Years and older · Female only
Enrollment
120 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2014
U.S. locations
27
States / cities
Sedona, Arizona • Tucson, Arizona • Denver, Colorado + 22 more
Source: ClinicalTrials.gov public record
Updated Jun 12, 2016 · Synced Sep 19, 2026, 3:57 PM EDT
Completed Phase 2 Interventional Results available

Comparing Letrozole Given Alone to Letrozole Given With Avastin in Post-Menopausal Women Breast Cancer

NCT00530868
View directory record Official record
Conditions
Breast Cancer, Cancer of the Breast, Breast Neoplasm
Interventions
Letrozole (Femara), Letrozole; Avastin
Other · Drug
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
19 Years and older
Enrollment
75 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2022
U.S. locations
7
States / cities
Birmingham, Alabama • San Francisco, California • Washington D.C., District of Columbia + 4 more
Source: ClinicalTrials.gov public record
Updated Oct 20, 2022 · Synced Sep 19, 2026, 3:57 PM 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 19, 2026, 3:57 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 19, 2026, 3:57 PM EDT
Completed Phase 1Phase 2 Interventional Results available

Phase I/II Trial of Letrozole and Sorafenib in Post-Menopausal Hormone-Receptor + Breast Cancer

NCT00634634
View directory record Official record
Conditions
Metastatic Breast Cancer
Interventions
Sorafenib, Letrozole
Drug
Lead sponsor
Rutgers, The State University of New Jersey
Other
Eligibility
18 Years and older · Female only
Enrollment
52 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2023
U.S. locations
4
States / cities
Washington D.C., District of Columbia • Atlanta, Georgia • New Brunswick, New Jersey + 1 more
Source: ClinicalTrials.gov public record
Updated Nov 8, 2023 · Synced Sep 19, 2026, 3:57 PM EDT
Active, not recruiting Phase 2 Interventional Results available

Extension Study of Lapatinib Plus Herceptin With or Without Endocrine Therapy

NCT00999804
View directory record Official record
Conditions
Breast Cancer
Interventions
Lapatinib, Letrozole, Trastuzumab
Drug
Lead sponsor
Baylor Breast Care Center
Other
Eligibility
18 Years and older · Female only
Enrollment
128 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011 – 2026
U.S. locations
8
States / cities
Birmingham, Alabama • Chicago, Illinois • Indianapolis, Indiana + 5 more
Source: ClinicalTrials.gov public record
Updated Mar 11, 2025 · Synced Sep 19, 2026, 3:57 PM EDT
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 19, 2026, 3:57 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 19, 2026, 3:57 PM EDT
Terminated Phase 2 Interventional Results available

Neoadjuvant Study of Palbociclib in Combination With Letrozole and Trastuzumab in Stage II-III ER+ HER2+ Breast Cancer

NCT02907918
View directory record Official record
Conditions
Breast Cancer, Cancer of Breast, Breast Carcinoma
Interventions
Palbociclib, Letrozole, Trastuzumab, Goserelin, Breast surgery, Research tumor biopsy, Research bone marrow (OPTIONAL), Research blood sample, Research blood for germline DNA, Blood for detection of circulating tumor cells
Drug · Biological · Procedure + 1 more
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years and older
Enrollment
26 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2020
U.S. locations
3
States / cities
Phoenix, Arizona • St Louis, Missouri • Buffalo, New York
Source: ClinicalTrials.gov public record
Updated Sep 28, 2021 · Synced Sep 19, 2026, 3:57 PM EDT
Completed Phase 2 Interventional Results available

A Study for Safety and Effectiveness of IMC-A12 by Itself or Combined With Antiestrogens to Treat Breast Cancer

NCT00728949
View directory record Official record
Conditions
Metastatic Breast Cancer
Interventions
IMC-A12 (cixutumumab), tamoxifen, Anastrozole, Letrozole, Exemestane, Fulvestrant
Biological · Drug
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
18 Years and older · Female only
Enrollment
93 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2015
U.S. locations
9
States / cities
Scottsdale, Arizona • Chicago, Illinois • Westwood, Kansas + 6 more
Source: ClinicalTrials.gov public record
Updated Jun 5, 2018 · Synced Sep 19, 2026, 3:57 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 19, 2026, 3:57 PM EDT
Active, not recruiting Phase 1 Interventional

To Evaluate the Safety, Tolerability, and Pharmacokinetics of Inavolisib Single Agent in Participants With Solid Tumors and in Combination With Endocrine and Targeted Therapies in Participants With Breast Cancer

NCT03006172
View directory record Official record
Conditions
Breast Cancer, Solid Tumor
Interventions
Inavolisib, Fulvestrant, Letrozole, Palbociclib, Metformin, Trastuzumab, Pertuzumab
Drug
Lead sponsor
Genentech, Inc.
Industry
Eligibility
18 Years and older
Enrollment
200 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2026
U.S. locations
5
States / cities
Boston, Massachusetts • New York, New York • Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Sep 7, 2026 · Synced Sep 19, 2026, 3:57 PM EDT
Recruiting Phase 3 Interventional

Phase IIIb Study of Ribociclib + ET in Early Breast Cancer

NCT05827081
View directory record Official record
Conditions
Early Breast Cancer
Interventions
Ribociclib, Letrozole, Ansastrozole, Goserelin, Leuprolide, Exemestane
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
18 Years to 100 Years
Enrollment
1,400 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2030
U.S. locations
85
States / cities
Birmingham, Alabama • Anchorage, Alaska • Goodyear, Arizona + 74 more
Source: ClinicalTrials.gov public record
Updated Sep 17, 2026 · Synced Sep 19, 2026, 3:57 PM EDT
Terminated Phase 2 Interventional Results available

Intermittent Letrozole Therapy in Postmenopausal Women With Metastatic Breast Cancer

NCT00549822
View directory record Official record
Conditions
Breast Cancer
Interventions
Letrozole
Drug
Lead sponsor
Massachusetts General Hospital
Other
Eligibility
18 Years and older · Female only
Enrollment
3 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2013
U.S. locations
2
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Mar 21, 2017 · Synced Sep 19, 2026, 3:57 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 19, 2026, 3:57 PM EDT
Completed Phase 2 Interventional

Open Label Trial for Post-Menopausal Women With Newly Diagnosed Operable Breast Cancer

NCT00161291
View directory record Official record
Conditions
Breast Cancer
Interventions
Letrozole in combination with Bevacizumab
Drug
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
60 Years and older · Female only
Enrollment
28 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2006
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Jan 3, 2011 · Synced Sep 19, 2026, 3:57 PM EDT