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ClinicalTrials.gov public records Last synced Sep 28, 2026, 12:22 AM EDT

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Showing 25–47 of 23 matching trials from the live ClinicalTrials.gov search.
Local D1 index available.
Filters: Intervention: Letrozole Tablets 2.5 mg Clear all
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 28, 2026, 12:22 AM EDT
Terminated Phase 2 Interventional Results available

A Pharmacodynamics Pre-surgical Study of LEE011 in Early Breast Cancer Patients (MONALEESA-1)

NCT01919229
View directory record Official record
Conditions
Early Breast Cancer
Interventions
LEE011 (ribociclib), letrozole
Drug
Lead sponsor
Novartis Pharmaceuticals
Industry
Eligibility
18 Years and older · Female only
Enrollment
14 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2014
U.S. locations
4
States / cities
Fayetteville, Arkansas • Los Angeles, California • Boston, Massachusetts + 1 more
Source: ClinicalTrials.gov public record
Updated Dec 31, 2015 · Synced Sep 28, 2026, 12:22 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 28, 2026, 12:22 AM EDT
Not listed Phase 3 Interventional Results available

Letrozole in Treating Postmenopausal Women Who Have Received Hormone Therapy for Hormone Receptor-Positive Breast Cancer

NCT00382070
View directory record Official record
Conditions
Breast Cancer
Interventions
Letrozole, Placebo
Drug · Other
Lead sponsor
NSABP Foundation Inc
Network
Eligibility
18 Years to 120 Years · Female only
Enrollment
3,966 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2025
U.S. locations
777
States / cities
Anniston, Alabama • Mobile, Alabama • Anchorage, Alaska + 523 more
Source: ClinicalTrials.gov public record
Updated Mar 21, 2024 · Synced Sep 28, 2026, 12:22 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 28, 2026, 12:22 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 28, 2026, 12:22 AM 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 28, 2026, 12:22 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 28, 2026, 12:22 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 28, 2026, 12:22 AM EDT
Recruiting Phase 1Phase 2 Interventional

A Study Evaluating the Efficacy and Safety of Multiple Treatment Combinations in Patients With Metastatic or Locally Advanced Breast Cancer

NCT03424005
View directory record Official record
Conditions
Metastatic Breast Cancer
Interventions
Capecitabine, Atezolizumab, Ipatasertib, SGN-LIV1A, Bevacizumab, Chemotherapy (Gemcitabine + Carboplatin or Eribulin), Selicrelumab, Tocilizumab, Nab-Paclitaxel, Sacituzumab Govitecan, Abemaciclib, Fulvestrant, Ribociclib (Dose #1), Inavolisib (Dose #1), Trastuzumab Deruxtecan, Ribociclib (Dose #2), Letrozole, Inavolisib (Dose #2), Empagliflozin, Palbociclib, Metformin, Atirmociclib, Giredestrant
Drug
Lead sponsor
Hoffmann-La Roche
Industry
Eligibility
18 Years and older
Enrollment
1,132 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2030
U.S. locations
24
States / cities
Duarte, California • Irvine, California • La Jolla, California + 18 more
Source: ClinicalTrials.gov public record
Updated Sep 9, 2026 · Synced Sep 28, 2026, 12:22 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 12, 2022 · Synced Sep 28, 2026, 12:22 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 28, 2026, 12:22 AM 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 28, 2026, 12:22 AM 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 28, 2026, 12:22 AM 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 28, 2026, 12:22 AM 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 28, 2026, 12:22 AM EDT
Completed Phase 2Phase 3 Interventional

Vaginal Progesterone Supplementation in Women With PCOS Undergoing Ovulation Induction With Letrozole

NCT03440359
View directory record Official record
Conditions
Polycystic Ovary Syndrome
Interventions
Progesterone Vaginal Gel 8%, Letrozole Oral Tablet, pelvic ultrasound, Ovidrel 250 MCG Per 0.5 ML Prefilled Syringe, Intrauterine insemination or timed intercourse
Drug · Diagnostic Test · Other
Lead sponsor
Eastern Virginia Medical School
Other
Eligibility
20 Years to 40 Years · Female only
Enrollment
52 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2012 – 2017
U.S. locations
1
States / cities
Norfolk, Virginia
Source: ClinicalTrials.gov public record
Updated Feb 25, 2018 · Synced Sep 28, 2026, 12:22 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 24, 2026 · Synced Sep 28, 2026, 12:22 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 Sep 22, 2026 · Synced Sep 28, 2026, 12:22 AM 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 28, 2026, 12:22 AM 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 28, 2026, 12:22 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
176
States / cities
Daphne, Alabama • Chandler, Arizona • Gilbert, Arizona + 139 more
Source: ClinicalTrials.gov public record
Updated Sep 14, 2026 · Synced Sep 28, 2026, 12:22 AM EDT
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 28, 2026, 12:22 AM EDT