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Showing 1–24 of 26 matching trials from the live ClinicalTrials.gov search.
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Filters: Intervention: Tamoxifen 20mg Clear all
Completed Phase 3 Interventional Results available

Suppression of Ovarian Function With Either Tamoxifen or Exemestane Compared With Tamoxifen Alone in Treating Premenopausal Women With Hormone-Responsive Breast Cancer

NCT00066690
View directory record Official record
Conditions
Estrogen Receptor Positive Breast Cancer, Progesterone Receptor Positive Tumor, Recurrent Breast Carcinoma, Stage IA Breast Cancer, Stage IB Breast Cancer, Stage IIA Breast Cancer, Stage IIB Breast Cancer, Stage IIIA Breast Cancer
Interventions
Exemestane, Laboratory Biomarker Analysis, Oophorectomy, Quality-of-Life Assessment, Radiation Therapy, Tamoxifen, Triptorelin
Drug · Other · Procedure + 1 more
Lead sponsor
ETOP IBCSG Partners Foundation
Network
Eligibility
18 Years to 65 Years · Female only
Enrollment
3,066 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2024
U.S. locations
480
States / cities
Birmingham, Alabama • Anchorage, Alaska • Scottsdale, Arizona + 323 more
Source: ClinicalTrials.gov public record
Updated Aug 25, 2026 · Synced Sep 24, 2026, 2:39 AM EDT
Completed Phase 3 Interventional

A Trial Comparing the Efficacy and Tolerability of Faslodex With Nolvadex in Postmenopausal Women With Advanced Breast Cancer

NCT00241449
View directory record Official record
Conditions
Breast Cancer, Metastasis
Interventions
Fulvestrant, Tamoxifen
Drug
Lead sponsor
AstraZeneca
Industry
Eligibility
Female only
Enrollment
51 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1998 – 2012
U.S. locations
24
States / cities
Little Rock, Arkansas • Fountain Valley, California • La Jolla, California + 21 more
Source: ClinicalTrials.gov public record
Updated Jun 5, 2012 · Synced Sep 24, 2026, 2:39 AM EDT
Completed Phase 2 Interventional Results available

Evaluation the Treatment of Tamoxifen of Low/Intermediate Risk Bladder Tumors

NCT02197897
View directory record Official record
Conditions
Bladder Cancer
Interventions
Tamoxifen Citrate
Drug
Lead sponsor
Baylor College of Medicine
Other
Eligibility
21 Years and older
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2019
U.S. locations
2
States / cities
Houston, Texas
Source: ClinicalTrials.gov public record
Updated Jan 12, 2021 · Synced Sep 24, 2026, 2:39 AM EDT
Recruiting Phase 2 Interventional

Finding the Best Tamoxifen Dose for Breast Cancer Risk Reduction in Premenopausal Women, RENAISSANCE Trial

NCT06184750
View directory record Official record
Conditions
Breast Atypical Ductal Hyperplasia, Breast Atypical Lobular Hyperplasia, Breast Carcinoma, Breast Ductal Carcinoma In Situ, Breast Lobular Carcinoma In Situ, Estrogen Receptor-Positive Breast Carcinoma
Interventions
Biopsy Procedure, Biospecimen Collection, Mammography, Questionnaire Administration, Tamoxifen
Procedure · Other · Drug
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
18 Years to 55 Years · Female only
Enrollment
200 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2028
U.S. locations
11
States / cities
Tucson, Arizona • Chicago, Illinois • Kansas City, Kansas + 6 more
Source: ClinicalTrials.gov public record
Updated Jul 26, 2026 · Synced Sep 24, 2026, 2:39 AM EDT
Recruiting Phase 2 Interventional

Evaluating the Use of a Medication 'Switch' vs Guideline-directed Interventions for Relieving Side Effects of Aromatase Inhibitors Among Breast Cancer Patients

NCT07071038
View directory record Official record
Conditions
Breast Cancer, Adjuvant Treatment, Early Stage Breast Cancer
Interventions
Switch, Guideline Directed Intervention (GDI)
Drug · Other
Lead sponsor
Dartmouth-Hitchcock Medical Center
Other
Eligibility
18 Years and older
Enrollment
62 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2027
U.S. locations
1
States / cities
Lebanon, New Hampshire
Source: ClinicalTrials.gov public record
Updated Feb 11, 2026 · Synced Sep 24, 2026, 2:39 AM EDT
Completed Phase 3 Interventional Results available

Brain Function in Premenopausal Women Receiving Tamoxifen With or Without Ovarian Function Suppression for Early-Stage Breast Cancer on Clinical Trial IBCSG 24-02

NCT00659373
View directory record Official record
Conditions
Breast Cancer, Fatigue, Sleep Disorders
Interventions
Tamoxifen, triptorelin, Exemestane
Drug
Lead sponsor
ETOP IBCSG Partners Foundation
Network
Eligibility
Up to 120 Years · Female only
Enrollment
86 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2007 – 2016
U.S. locations
13
States / cities
Sacramento, California • Fort Collins, Colorado • Norwalk, Connecticut + 7 more
Source: ClinicalTrials.gov public record
Updated Jul 24, 2016 · Synced Sep 24, 2026, 2:39 AM EDT
Completed Phase 2 Interventional Results available

4-Hydroxytamoxifen or Tamoxifen Citrate in Treating Women With Newly Diagnosed Ductal Breast Carcinoma in Situ

NCT00952731
View directory record Official record
Conditions
Ductal Breast Carcinoma in Situ, Estrogen Receptor-positive Breast Cancer
Interventions
oral placebo, afimoxifene, tamoxifen citrate, placebo gel
Drug
Lead sponsor
Northwestern University
Other
Eligibility
18 Years and older · Female only
Enrollment
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2009
U.S. locations
1
States / cities
Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Jul 20, 2015 · Synced Sep 24, 2026, 2:39 AM EDT
Completed Phase 2 Interventional

Neoadjuvant Endocrine Therapy in ER-positive, HER2-negative Early Stage Breast Cancer

NCT05150652
View directory record Official record
Conditions
Breast Cancer, HER2-negative Breast Cancer, Node-negative Breast Cancer, Breast Carcinoma
Interventions
Anastrozole 1mg, Letrozole 2.5mg, Exemestane 25 mg, Tamoxifen
Drug
Lead sponsor
Irada Ibrahim-zada
Other
Eligibility
18 Years to 99 Years · Female only
Enrollment
8 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2022 – 2026
U.S. locations
1
States / cities
Lexington, Kentucky
Source: ClinicalTrials.gov public record
Updated Aug 30, 2026 · Synced Sep 24, 2026, 2:39 AM EDT
Recruiting Phase 1 Interventional

Chemoprevention With Tamoxifen in Pre-Invasive Pancreas Mucinous Cystic Neoplasms Not Undergoing Immediate Resection

NCT06320990
View directory record Official record
Conditions
Pancreatic Cyst, Pancreatic Mucinous Cystic Neoplasm
Interventions
Tamoxifen 20mg
Drug
Lead sponsor
University of Nebraska
Other
Eligibility
19 Years and older
Enrollment
15 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2025 – 2029
U.S. locations
1
States / cities
Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated May 13, 2026 · Synced Sep 24, 2026, 2:39 AM EDT
Active, not recruiting Phase 2 Interventional

Neoadjuvant Endocrine Therapy, Palbociclib, Avelumab in Estrogen Receptor Positive Breast Cancer

NCT03573648
View directory record Official record
Conditions
Breast Cancer
Interventions
Avelumab, Endocrine therapy, Palbociclib
Drug
Lead sponsor
Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins
Other
Eligibility
18 Years and older
Enrollment
33 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2018 – 2026
U.S. locations
4
States / cities
Birmingham, Alabama • Washington D.C., District of Columbia • Baltimore, Maryland + 1 more
Source: ClinicalTrials.gov public record
Updated Mar 18, 2026 · Synced Sep 24, 2026, 2:39 AM EDT
Completed Not applicable Interventional

Tamoxifen in the Prevention of Breast Cancer in Hodgkin's Disease Survivors

NCT00165308
View directory record Official record
Conditions
Hodgkin's Disease, Breast Cancer
Interventions
Tamoxifen
Drug
Lead sponsor
Dana-Farber Cancer Institute
Other
Eligibility
18 Years to 35 Years · Female only
Enrollment
29 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2009
U.S. locations
2
States / cities
Boston, Massachusetts
Source: ClinicalTrials.gov public record
Updated Jul 8, 2014 · Synced Sep 24, 2026, 2:39 AM EDT
Completed Phase 3 Interventional Results available

Prostate Cancer Prevention Study for Men With High Grade PIN (Prostatic Intraepithelial Neoplasia)

NCT00106691
View directory record Official record
Conditions
Preneoplastic Conditions, Prostatic Intraepithelial Neoplasia
Interventions
Toremifene 20 mg, Placebo
Drug
Lead sponsor
GTx
Industry
Eligibility
30 Years and older · Male only
Enrollment
1,589 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2010
U.S. locations
108
States / cities
Huntsville, Alabama • Mobile, Alabama • Phoenix, Arizona + 93 more
Source: ClinicalTrials.gov public record
Updated Jun 11, 2023 · Synced Sep 24, 2026, 2:39 AM EDT
Terminated Phase 1 Interventional Results available

Examination of Breast Cancer Cells of Pre-menopausal and Post-menopausal Women Before and After Exposure to Tamoxifen or Fulvestrant.

NCT02936206
View directory record Official record
Conditions
Breast Cancer
Interventions
Fulvestrant, Tamoxifen
Drug
Lead sponsor
Icahn School of Medicine at Mount Sinai
Other
Eligibility
18 Years and older · Female only
Enrollment
2 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2020
U.S. locations
3
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated May 18, 2021 · Synced Sep 24, 2026, 2:39 AM EDT
Completed No phase listed Observational

Tamoxifen Pharmacogenetics and Clinical Effects

NCT00228930
View directory record Official record
Conditions
Breast Cancer
Interventions
Tamoxifen (pharmacodynamic analysis)
Drug
Lead sponsor
National Institute of General Medical Sciences (NIGMS)
NIH
Eligibility
18 Years to 70 Years · Female only
Enrollment
297 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2002 – 2007
U.S. locations
2
States / cities
Indianapolis, Indiana • Ann Arbor, Michigan
Source: ClinicalTrials.gov public record
Updated Sep 24, 2008 · Synced Sep 24, 2026, 2:39 AM EDT
Terminated Phase 1Phase 2 Interventional Results available

Re-expression of ER in Triple Negative Breast Cancers

NCT01194908
View directory record Official record
Conditions
Breast Cancer, Breast Tumors, Breast Neoplasms
Interventions
Decitabine, LBH589, Tamoxifen
Drug
Lead sponsor
Emory University
Other
Eligibility
18 Years and older
Enrollment
5 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2010 – 2014
U.S. locations
1
States / cities
Atlanta, Georgia
Source: ClinicalTrials.gov public record
Updated Jan 25, 2015 · Synced Sep 24, 2026, 2:39 AM EDT
Completed Phase 3 Interventional Results available

Triptorelin With Either Exemestane or Tamoxifen in Treating Premenopausal Women With Hormone-Responsive Breast Cancer

NCT00066703
View directory record Official record
Conditions
Breast Cancer
Interventions
exemestane, tamoxifen, triptorelin
Drug
Lead sponsor
ETOP IBCSG Partners Foundation
Network
Eligibility
18 Years to 65 Years · Female only
Enrollment
2,672 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2024
U.S. locations
139
States / cities
Burbank, California • La Jolla, California • Mission Hills, California + 106 more
Source: ClinicalTrials.gov public record
Updated Feb 5, 2026 · Synced Sep 24, 2026, 2:39 AM EDT
Completed Phase 2 Interventional Results available

A Study of Palbociclib in Combination With Fulvestrant or Tamoxifen as Treatment for Metastatic Breast Cancer

NCT02384239
View directory record Official record
Conditions
Metastatic Breast Cancer, Hormone Receptor Positive
Interventions
Palbociclib, Tamoxifen, Fulvestrant
Drug
Lead sponsor
University of California, San Francisco
Other
Eligibility
18 Years and older
Enrollment
70 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2015 – 2021
U.S. locations
9
States / cities
San Francisco, California • Washington D.C., District of Columbia • Chicago, Illinois + 6 more
Source: ClinicalTrials.gov public record
Updated Mar 15, 2022 · Synced Sep 24, 2026, 2:39 AM EDT
Completed No phase listed Observational

A Pilot Study of Varying Doses of Tamoxifen in the Setting of Genetic Polymorphisms of CYP2D6

NCT00900744
View directory record Official record
Conditions
Breast Cancer
Interventions
Tamoxifen
Drug
Lead sponsor
Icahn School of Medicine at Mount Sinai
Other
Eligibility
18 Years and older
Enrollment
121 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2012
U.S. locations
1
States / cities
New York, New York
Source: ClinicalTrials.gov public record
Updated Aug 24, 2017 · Synced Sep 24, 2026, 2:39 AM EDT
Completed Phase 2 Interventional Results available

Study of Avastin (Bevacizumab) to Reverse Acquired Estrogen Independence in Previously Hormone Responsive Metastatic Breast Ca.

NCT00240071
View directory record Official record
Conditions
Metastatic Breast Cancer
Interventions
Avastin, Hormonal therapy
Drug
Lead sponsor
University of Alabama at Birmingham
Other
Eligibility
19 Years to 80 Years · Female only
Enrollment
30 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2011
U.S. locations
1
States / cities
Birmingham, Alabama
Source: ClinicalTrials.gov public record
Updated Oct 29, 2019 · Synced Sep 24, 2026, 2:39 AM EDT
Completed Phase 2 Interventional Results available

Palbociclib in Combination With Adjuvant Endocrine Therapy for Hormone Receptor Positive, HER2 Negative Invasive Breast Cancer

NCT02040857
View directory record Official record
Conditions
Breast Cancer
Interventions
Palbociclib, Aromatase Inhibitor
Drug
Lead sponsor
Dana-Farber Cancer Institute
Other
Eligibility
18 Years and older
Enrollment
162 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2014 – 2024
U.S. locations
10
States / cities
San Francisco, California • Indianapolis, Indiana • Boston, Massachusetts + 5 more
Source: ClinicalTrials.gov public record
Updated Apr 28, 2025 · Synced Sep 24, 2026, 2:39 AM EDT
Terminated Phase 2 Interventional Results available

A Study of Vorinostat and Tamoxifen in Newly Diagnosed Breast Cancer

NCT01194427
View directory record Official record
Conditions
Stage I Breast Cancer, Stage II Breast Cancer, Stage III Breast Cancer, Invasive Breast Cancer
Interventions
Vorinostat and Tamoxifen
Drug
Lead sponsor
Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins
Other
Eligibility
18 Years and older · Female only
Enrollment
2 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2011
U.S. locations
1
States / cities
Baltimore, Maryland
Source: ClinicalTrials.gov public record
Updated May 16, 2013 · Synced Sep 24, 2026, 2:39 AM EDT
Completed Phase 1 Interventional Accepts healthy volunteers

A Study To Determine If Coadministration Of Tamoxifen Alters The Extent Or Rate Of Palbociclib (PD-0332991) Absorption Or Elimination In Healthy Male Volunteers

NCT01821066
View directory record Official record
Conditions
Healthy
Interventions
PD-0332991 alone, Tamoxifen 60 mg, Tamoxifen 20 mg, PD-0332991 combination
Drug
Lead sponsor
Pfizer
Industry
Eligibility
18 Years to 55 Years · Male only
Enrollment
25 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2013
U.S. locations
1
States / cities
New Haven, Connecticut
Source: ClinicalTrials.gov public record
Updated Oct 7, 2015 · Synced Sep 24, 2026, 2:39 AM EDT
Completed Phase 2 Interventional

Study of Tamoxifen in Well Differentiated Neuroendocrine Tumors and Hormone Receptor Positive Expression

NCT03870399
View directory record Official record
Conditions
Neuroendocrine Tumors, Progesterone Receptor Positive Tumor, Estrogen Receptor Positive Tumor
Interventions
Tamoxifen
Drug
Lead sponsor
AC Camargo Cancer Center
Other
Eligibility
18 Years and older
Enrollment
23 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2019 – 2023
U.S. locations
1
States / cities
Tampa, Florida
Source: ClinicalTrials.gov public record
Updated May 5, 2024 · Synced Sep 24, 2026, 2:39 AM EDT
Terminated Phase 2 Interventional Results available

A Pilot Clinical Trial to Evaluate the Biological Activity of Fulvestrant in Breast Ductal Carcinoma in Situ (DCIS)

NCT00183963
View directory record Official record
Conditions
Breast Carcinoma
Interventions
Tamoxifen, Fulvestrant
Drug
Lead sponsor
University of Southern California
Other
Eligibility
18 Years and older · Female only
Enrollment
4 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2006 – 2008
U.S. locations
1
States / cities
Los Angeles, California
Source: ClinicalTrials.gov public record
Updated May 21, 2014 · Synced Sep 24, 2026, 2:39 AM EDT