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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 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 23, 2026, 7:23 PM 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 23, 2026, 7:23 PM EDT
Completed Phase 3 Interventional Results available

Everolimus in Combination With Exemestane in the Treatment of Postmenopausal Women With Estrogen Receptor Positive Locally Advanced or Metastatic Breast Cancer Who Are Refractory to Letrozole or Anastrozole

NCT00863655
View directory record Official record
Conditions
Breast Cancer
Interventions
Everolimus, Exemestane, Everolimus Placebo
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
18 Years and older · Female only
Enrollment
724 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2014
U.S. locations
63
States / cities
Chandler, Arizona • Fayetteville, Arkansas • Anaheim, California + 54 more
Source: ClinicalTrials.gov public record
Updated May 1, 2017 · Synced Sep 23, 2026, 7:23 PM EDT
Completed Not applicable Interventional Results available

Serum Estradiol Levels In Postmenopausal Women With Breast Cancer Receiving Adjuvant Aromatase Inhibitors and Vaginal Estrogen

NCT00984399
View directory record Official record
Conditions
Atrophic Vaginitis, Breast Cancer
Interventions
Vagifem® (vaginal 17β-estradiol) questionnaire & menopause symptom checklist
Drug
Lead sponsor
Memorial Sloan Kettering Cancer Center
Other
Eligibility
18 Years and older · Female only
Enrollment
31 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2024
U.S. locations
5
States / cities
Basking Ridge, New Jersey • Commack, New York • New York, New York + 2 more
Source: ClinicalTrials.gov public record
Updated Dec 8, 2025 · Synced Sep 23, 2026, 7:23 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 23, 2026, 7:23 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 23, 2026, 7:23 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 23, 2026, 7:23 PM 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 23, 2026, 7:23 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 23, 2026, 7:23 PM 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 23, 2026, 7:23 PM EDT
Terminated Phase 2 Interventional Results available

Study of BMS-754807 Combined With Letrozole or BMS-754807 Alone in Patients With Hormone Receptor-Positive Breast Cancer and Resistance to Non-Steroidal Aromatase Inhibitors

NCT01225172
View directory record Official record
Conditions
Breast Cancer
Interventions
BMS-754807, letrozole
Drug
Lead sponsor
Bristol-Myers Squibb
Industry
Eligibility
18 Years and older · Female only
Enrollment
77 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2014
U.S. locations
21
States / cities
Birmingham, Alabama • Scottsdale, Arizona • San Diego, California + 14 more
Source: ClinicalTrials.gov public record
Updated Aug 10, 2020 · Synced Sep 23, 2026, 7:23 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 23, 2026, 7:23 PM 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 23, 2026, 7:23 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 23, 2026, 7:23 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 23, 2026, 7:23 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 Sep 10, 2026 · Synced Sep 23, 2026, 7:23 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 23, 2026, 7:23 PM 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 23, 2026, 7:23 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 23, 2026, 7:23 PM EDT
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 Sep 20, 2026 · Synced Sep 23, 2026, 7:23 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 23, 2026, 7:23 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 23, 2026, 7:23 PM EDT
Recruiting Phase 2 Interventional

ALPINE: Maintenance Letrozole/Abemaciclib

NCT06366347
View directory record Official record
Conditions
Endometrial Cancer, Recurrent Endometrial Cancer, TP53
Interventions
Abemaciclib, Letrozole, Pembrolizumab
Drug
Lead sponsor
Dana-Farber Cancer Institute
Other
Eligibility
18 Years and older
Enrollment
32 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2029
U.S. locations
6
States / cities
Boston, Massachusetts • Foxborough, Massachusetts • Milford, Massachusetts + 1 more
Source: ClinicalTrials.gov public record
Updated Sep 15, 2026 · Synced Sep 23, 2026, 7:23 PM 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 23, 2026, 7:23 PM EDT