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ClinicalTrials.gov public records Last synced Oct 5, 2026, 2:44 AM EDT

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Showing 25–48 of 132 matching trials from the live ClinicalTrials.gov search.
Filters: Intervention: letrozole 2.5 mg Clear all
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 17, 2024 · Synced Oct 5, 2026, 2:44 AM 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 23, 2018 · Synced Oct 5, 2026, 2:44 AM EDT
Completed Phase 3 Interventional Results available

Exemestane, Letrozole, or Anastrozole in Treating Postmenopausal Women Who Are Undergoing Surgery for Stage II or Stage III Breast Cancer

NCT00265759
View directory record Official record
Conditions
Breast Cancer
Interventions
anastrozole, exemestane, letrozole, Therapeutic Conventional Surgery
Drug · Procedure
Lead sponsor
Alliance for Clinical Trials in Oncology
Other
Eligibility
Female only
Enrollment
622 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2019
U.S. locations
3
States / cities
St Louis, Missouri • Houston, Texas • Laredo, Texas
Source: ClinicalTrials.gov public record
Updated Apr 23, 2025 · Synced Oct 5, 2026, 2:44 AM EDT
Active, not recruiting Phase 3 Interventional

A Trial to Evaluate Efficacy and Safety of Ribociclib With Endocrine Therapy as Adjuvant Treatment in Patients With HR+/HER2- Early Breast Cancer

NCT03701334
View directory record Official record
Conditions
Early Breast Cancer
Interventions
Ribociclib, Endocrine Therapy (ET)
Drug · Other
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
18 Years to 100 Years
Enrollment
5,101 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2030
U.S. locations
73
States / cities
Birmingham, Alabama • Goodyear, Arizona • Jonesboro, Arkansas + 68 more
Source: ClinicalTrials.gov public record
Updated Sep 18, 2026 · Synced Oct 5, 2026, 2:44 AM EDT
Active, not recruiting Phase 2 Interventional

Clinical Trial Assessing the Safety of Neoadjuvant Palbociclib in Combination With Endocrine Therapy

NCT05069038
View directory record Official record
Conditions
Breast Cancer
Interventions
Palbociclib 125mg
Drug
Lead sponsor
University of Nebraska
Other
Eligibility
19 Years and older · Female only
Enrollment
51 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2032
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Aug 19, 2026 · Synced Oct 5, 2026, 2:44 AM EDT
Completed Phase 2 Interventional

Neoadjuvant Letrozole in Treating Postmenopausal Women With Estrogen-Receptor Positive and/or Progesterone-Receptor Positive Stage II, Stage IIIA, or Stage IIIB Breast Cancer

NCT00084396
View directory record Official record
Conditions
Breast Cancer
Interventions
letrozole, conventional surgery
Drug · Procedure
Lead sponsor
Washington University School of Medicine
Other
Eligibility
18 Years and older · Female only
Enrollment
115 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2016
U.S. locations
1
States / cities
St Louis, Missouri
Source: ClinicalTrials.gov public record
Updated Sep 26, 2016 · Synced Oct 5, 2026, 2:44 AM EDT
Completed No phase listed Observational

An Examination of Predictors of Indicators of Response to Letrozole 2.5 mg

NCT00291109
View directory record Official record
Conditions
Breast Cancer
Interventions
letrozole 2.5 mg
Drug
Lead sponsor
University of Kansas
Other
Eligibility
18 Years and older · Female only
Enrollment
40 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2005
U.S. locations
1
States / cities
Kansas City, Kansas
Source: ClinicalTrials.gov public record
Updated Sep 16, 2008 · Synced Oct 5, 2026, 2:44 AM 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 9, 2021 · Synced Oct 5, 2026, 2:44 AM EDT
Terminated Phase 2 Interventional Results available

A Study of R1507 in Combination With Letrozole in Postmenopausal Women With Advanced Breast Cancer

NCT00796107
View directory record Official record
Conditions
Breast Cancer
Interventions
RG1507, Letrozole
Drug
Lead sponsor
Hoffmann-La Roche
Industry
Eligibility
18 Years and older · Female only
Enrollment
6 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2010
U.S. locations
6
States / cities
Birmingham, Alabama • Washington D.C., District of Columbia • Miami, Florida + 3 more
Source: ClinicalTrials.gov public record
Updated Nov 13, 2020 · Synced Oct 5, 2026, 2:44 AM 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 Sep 1, 2026 · Synced Oct 5, 2026, 2:44 AM 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 15, 2025 · Synced Oct 5, 2026, 2:44 AM EDT
Terminated Phase 2 Interventional Results available

Letrozole in Patients With Hepatopulmonary Syndrome

NCT04577001
View directory record Official record
Conditions
Hepatopulmonary Syndrome
Interventions
Letrozole, Placebo
Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 99 Years
Enrollment
1 participant
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated May 14, 2024 · Synced Oct 5, 2026, 2:44 AM 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 23, 2026 · Synced Oct 5, 2026, 2:44 AM 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 24, 2025 · Synced Oct 5, 2026, 2:44 AM EDT
Completed Phase 2 Interventional Results available

ER Reactivation Therapy for Breast Cancer

NCT02188745
View directory record Official record
Conditions
Metastatic Breast Cancer
Interventions
17B-estradiol, Letrozole, Anastrozole, Exemestane
Drug
Lead sponsor
Dartmouth-Hitchcock Medical Center
Other
Eligibility
18 Years and older · Female only
Enrollment
20 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2024
U.S. locations
3
States / cities
Springfield, Massachusetts • Rochester, Minnesota • Lebanon, New Hampshire
Source: ClinicalTrials.gov public record
Updated Sep 25, 2026 · Synced Oct 5, 2026, 2:44 AM EDT
No Longer Available No phase listed Expanded access

Expanded Access Study Of Palbociclib (PD-0332991) In Combination With Letrozole As Treatment Of Post-Menopausal Women With HR-Positive, Her2-Negative Advanced Breast Cancer For Whom Letrozole Therapy Is Deemed Appropriate

NCT02142868
View directory record Official record
Conditions
Advanced Breast Cancer (Female)
Interventions
Palbociclib, Letrozole
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years and older · Female only
Healthy volunteers
Healthy volunteers not accepted
U.S. locations
44
States / cities
Bakersfield, California • Washington D.C., District of Columbia • Duluth, Georgia + 30 more
Source: ClinicalTrials.gov public record
Updated Dec 21, 2018 · Synced Oct 5, 2026, 2:44 AM 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 Sep 25, 2026 · Synced Oct 5, 2026, 2:44 AM EDT
Active, not recruiting Phase 3 Interventional Results available

Randomized, Open Label, Clinical Study of the Targeted Therapy, Palbociclib, to Treat Metastatic Breast Cancer

NCT02947685
View directory record Official record
Conditions
HER-2 Positive Breast Cancer, Estrogen Receptor Positive Breast Cancer
Interventions
palbociclib, trastuzumab, pertuzumab, letrozole, Anastrozole, Exemestane, Fulvestrant
Drug
Lead sponsor
Alliance Foundation Trials, LLC.
Other
Eligibility
18 Years and older
Enrollment
518 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2026
U.S. locations
35
States / cities
San Francisco, California • Washington D.C., District of Columbia • Clearwater, Florida + 30 more
Source: ClinicalTrials.gov public record
Updated Feb 12, 2026 · Synced Oct 5, 2026, 2:44 AM 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 15, 2016 · Synced Oct 5, 2026, 2:44 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

Letrozole in Preventing Breast Cancer in Healthy Postmenopausal Women at High Risk for Breast Cancer

NCT01077453
View directory record Official record
Conditions
Healthy, no Evidence of Disease, Lobular Breast Carcinoma in Situ
Interventions
letrozole, quality-of-life assessment, laboratory biomarker analysis
Drug · Other
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
35 Years and older · Female only
Enrollment
112 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
Started 2010
U.S. locations
3
States / cities
Tucson, Arizona • Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Oct 20, 2014 · Synced Oct 5, 2026, 2:44 AM EDT
Completed Phase 2 Interventional Results available

A Phase II Randomized Study Evaluating the Biological and Clinical Effects of the Combination of Palbociclib With Letrozole as Neoadjuvant Therapy in Post-Menopausal Women With Estrogen-Receptor Positive Primary Breast Cancer

NCT02296801
View directory record Official record
Conditions
Breast Cancer, Breast Carcinoma, Breast Tumors
Interventions
Letrozole, palbociclib
Drug
Lead sponsor
NSABP Foundation Inc
Network
Eligibility
18 Years and older · Female only
Enrollment
307 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2019
U.S. locations
19
States / cities
Long Beach, California • Miami, Florida • Decatur, Illinois + 13 more
Source: ClinicalTrials.gov public record
Updated Jan 13, 2022 · Synced Oct 5, 2026, 2:44 AM EDT
Completed Early Phase 1 Interventional

A 2-Week Ketogenic Diet in Combination With Letrozole to Modulate PI3K Signaling in ER+ Breast Cancer

NCT03962647
View directory record Official record
Conditions
Estrogen Receptor-positive Breast Cancer
Interventions
2-Week Ketogenic Diet, Letrozole
Dietary Supplement · Drug
Lead sponsor
Vanderbilt-Ingram Cancer Center
Other
Eligibility
18 Years and older · Female only
Enrollment
31 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2024
U.S. locations
1
States / cities
Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Apr 30, 2026 · Synced Oct 5, 2026, 2:44 AM EDT
Terminated Phase 1Phase 2 Interventional

Palbociclib in Estrogen Receptor Positive (ER+) Human Epidermal Growth Factor Receptor 2 Positive (HER2+) Metastatic Breast Cancer

NCT03709082
View directory record Official record
Conditions
HER2-positive Breast Cancer, Breast Cancer Metastatic
Interventions
Palbociclib 75mg, Letrozole 2.5mg, T-DM1, Palbociclib 100mg, Palbociclib 125mg, Palbociclib
Drug
Lead sponsor
University of Kansas Medical Center
Other
Eligibility
18 Years and older · Female only
Enrollment
3 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2021
U.S. locations
5
States / cities
Kansas City, Kansas • Overland Park, Kansas • Kansas City, Missouri + 1 more
Source: ClinicalTrials.gov public record
Updated Mar 5, 2024 · Synced Oct 5, 2026, 2:44 AM EDT
Completed Phase 1 Interventional

A Study of PI3-Kinase Inhibitor GDC-0941 in Combination With Paclitaxel, With and Without Bevacizumab or Trastuzumab, and With Letrozole, in Participants With Locally Recurrent or Metastatic Breast Cancer

NCT00960960
View directory record Official record
Conditions
Breast Cancer
Interventions
Bevacizumab, Pictilisib, Letrozole, Paclitaxel, Trastuzumab
Drug
Lead sponsor
Genentech, Inc.
Industry
Eligibility
18 Years and older
Enrollment
71 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2015
U.S. locations
3
States / cities
Peoria, Illinois • Boston, Massachusetts • Nashville, Tennessee
Source: ClinicalTrials.gov public record
Updated Dec 15, 2016 · Synced Oct 5, 2026, 2:44 AM EDT