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Showing 1–24 of 146 matching trials from the live ClinicalTrials.gov search.
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Filters: Condition: Tamoxifen Clear all
Recruiting Early Phase 1 Interventional

FES Imaging to Optimize Tamoxifen for Metastatic Breast Cancer

NCT04174352
View directory record Official record
Conditions
ERα+ Breast Cancer, ESR1 Gene Mutation
Interventions
Tamoxifen, FES PET/CT
Drug · Diagnostic Test
Lead sponsor
University of Wisconsin, Madison
Other
Eligibility
19 Years and older
Enrollment
12 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2020 – 2027
U.S. locations
2
States / cities
Madison, Wisconsin
Source: ClinicalTrials.gov public record
Updated Jul 20, 2026 · Synced Sep 5, 2026, 3:50 AM EDT
Completed Early Phase 1 Interventional

The Effect of Aspirin on Angiogenesis Proteins in Women on Tamoxifen Therapy

NCT00727948
View directory record Official record
Conditions
Breast Cancer, Angiogenesis
Interventions
Aspirin
Drug
Lead sponsor
University of Vermont
Other
Eligibility
18 Years to 95 Years · Female only
Enrollment
11 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2008 – 2012
U.S. locations
1
States / cities
Burlington, Vermont
Source: ClinicalTrials.gov public record
Updated Sep 16, 2020 · Synced Sep 5, 2026, 3:50 AM EDT
Recruiting Phase 2 Interventional

Acolbifene Versus Low Dose Tamoxifen for the Prevention of Breast Cancer in Premenopausal Women at High Risk for Development of Breast Cancer

NCT05941520
View directory record Official record
Conditions
Breast Atypical Hyperplasia, Breast Carcinoma, Breast Ductal Carcinoma In Situ, Breast Lobular Carcinoma In Situ
Interventions
Acolbifene Hydrochloride, Biospecimen Collection, Mammography, Questionnaire Administration, Random Periareolar Fine-Needle Aspiration, Tamoxifen
Drug · Procedure · Other
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
35 Years and older · Female only
Enrollment
80 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2024 – 2028
U.S. locations
4
States / cities
Duarte, California • Chicago, Illinois • Kansas City, Kansas + 1 more
Source: ClinicalTrials.gov public record
Updated Jul 6, 2026 · Synced Sep 5, 2026, 3:50 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 5, 2026, 3:50 AM EDT
Completed Phase 1 Interventional

A Phase I Study of OncoLAR® (Registered Trademark) (NSC 685403) With/Without Tamoxifen in Patients With Osteosarcoma

NCT00001436
View directory record Official record
Conditions
Neoplasm Metastasis, Osteosarcoma
Interventions
OncoLAR® (Registered Trademark), tamoxifen
Drug
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
Not listed
Enrollment
24 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1995 – 2000
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 3, 2008 · Synced Sep 5, 2026, 3:50 AM EDT
Not listed Phase 2 Interventional

Sunitinib, Tamoxifen, and Cisplatin in Treating Patients With High-Risk Ocular Melanoma

NCT00489944
View directory record Official record
Conditions
Intraocular Melanoma
Interventions
cisplatin, sunitinib malate, tamoxifen citrate, adjuvant therapy
Drug · Procedure
Lead sponsor
San Diego Pacific Oncology & Hematology Associates
Other
Eligibility
18 Years and older
Enrollment
50 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2007
U.S. locations
1
States / cities
Encinitas, California
Source: ClinicalTrials.gov public record
Updated Jan 9, 2014 · Synced Sep 5, 2026, 3:50 AM EDT
Completed Phase 2 Interventional

Radiation Therapy and Tamoxifen in Treating Adults With Newly Diagnosed Supratentorial Glioblastoma Multiforme

NCT00006388
View directory record Official record
Conditions
Brain and Central Nervous System Tumors
Interventions
tamoxifen citrate, radiation therapy
Drug · Radiation
Lead sponsor
Radiation Therapy Oncology Group
Network
Eligibility
18 Years and older
Enrollment
77 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
Started 2000
U.S. locations
237
States / cities
Birmingham, Alabama • Huntsville, Alabama • Mobile, Alabama + 184 more
Source: ClinicalTrials.gov public record
Updated Oct 21, 2020 · Synced Sep 5, 2026, 3:50 AM EDT
Completed Phase 1 Interventional

First-in-Human Dose Escalation Trial in Subjects With Advanced Malignancies

NCT01971515
View directory record Official record
Conditions
Solid Tumor
Interventions
MSC2363318A, MSC2363318A plus Trastuzumab, MSC2363318A plus Tamoxifen
Drug
Lead sponsor
EMD Serono
Industry
Eligibility
18 Years and older
Enrollment
101 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2013 – 2018
U.S. locations
15
States / cities
Birmingham, Alabama • Los Angeles, California • San Diego, California + 11 more
Source: ClinicalTrials.gov public record
Updated Sep 18, 2018 · Synced Sep 5, 2026, 3:50 AM EDT
Completed Not applicable Interventional Accepts healthy volunteers Results available

Impact of Low-dose Tamoxifen on BPU

NCT02979301
View directory record Official record
Conditions
High Background Uptake on MBI
Interventions
Tamoxifen
Drug
Lead sponsor
Mayo Clinic
Other
Eligibility
40 Years and older · Female only
Enrollment
22 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2017 – 2018
U.S. locations
1
States / cities
Rochester, Minnesota
Source: ClinicalTrials.gov public record
Updated Jul 15, 2019 · Synced Sep 5, 2026, 3:50 AM EDT
Not yet recruiting No phase listed Observational Accepts healthy volunteers

Anastrozole Adjuvant Trial - Study of Anastrozole Compared to NOLVADEX (Tamoxifen Citrate) for Adjuvant Treatment of Early Breast Cancer Clinical Studies), Adjunct Cytotoxic Chemotherapy and Malignant Joint Tumor

NCT06154590
View directory record Official record
Conditions
Metastatic Breast Cancer, Tumor, Muscle Neoplasms, Chronic Pain
Interventions
Method(s)1 Attribution, Method(s)2 Attribution,
Drug
Lead sponsor
DR. DIANE CHISESI NFS. MD. PHD.
Other
Eligibility
44 Years to 59 Years
Enrollment
100 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2024 – 2026
U.S. locations
1
States / cities
Colorado Springs, Colorado
Source: ClinicalTrials.gov public record
Updated Dec 3, 2023 · Synced Sep 5, 2026, 3:50 AM EDT
Completed Phase 1 Interventional

A Phase I Trial of Tamoxifen and 9-Cis-Retinoic Acid in Breast Cancer Patients

NCT00001504
View directory record Official record
Conditions
Breast Cancer, Breast Neoplasm
Interventions
9-cis-Retinoic Acid
Drug
Lead sponsor
National Cancer Institute (NCI)
NIH
Eligibility
Not listed
Enrollment
18 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
1996 – 2002
U.S. locations
1
States / cities
Bethesda, Maryland
Source: ClinicalTrials.gov public record
Updated Mar 3, 2008 · Synced Sep 5, 2026, 3:50 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 5, 2026, 3:50 AM EDT
Completed Phase 1 Interventional

Tamoxifen Compared With LY353381 in Treating Women With Newly Diagnosed Breast Cancer

NCT00005886
View directory record Official record
Conditions
Breast Cancer
Interventions
arzoxifene hydrochloride, tamoxifen citrate
Drug
Lead sponsor
University of Kansas Medical Center
Other
Eligibility
18 Years to 120 Years · Female only
Healthy volunteers
Healthy volunteers not accepted
Timeline
2000 – 2002
U.S. locations
9
States / cities
Birmingham, Alabama • Los Angeles, California • Palm Springs, California + 6 more
Source: ClinicalTrials.gov public record
Updated Jan 12, 2017 · Synced Sep 5, 2026, 3:50 AM EDT
Active, not recruiting Phase 2 Interventional

(Z)-Endoxifen for the Treatment of Premenopausal Women With ER+/HER2- Breast Cancer

NCT05607004
View directory record Official record
Conditions
Breast Neoplasms, Invasive Breast Cancer, Estrogen-receptor-positive Breast Cancer, HER2-negative Breast Cancer
Interventions
(Z)-endoxifen, goserelin
Drug
Lead sponsor
Atossa Therapeutics, Inc.
Industry
Eligibility
18 Years and older · Female only
Enrollment
87 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2023 – 2027
U.S. locations
14
States / cities
Phoenix, Arizona • Tucson, Arizona • Los Angeles, California + 11 more
Source: ClinicalTrials.gov public record
Updated Jul 7, 2026 · Synced Sep 5, 2026, 3:50 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 5, 2026, 3:50 AM EDT
Completed No phase listed Observational

Effect of Tamoxifen or an Aromatase Inhibitor on Estrogen Metabolism in Women Treated for Newly Diagnosed Breast Cancer

NCT00569543
View directory record Official record
Conditions
Breast Cancer
Interventions
high performance liquid chromatography, laboratory biomarker analysis, mass spectrometry, medical chart review
Other
Lead sponsor
University of Nebraska
Other
Eligibility
19 Years and older · Female only
Enrollment
27 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2005 – 2012
U.S. locations
2
States / cities
Rochester, Minnesota • Omaha, Nebraska
Source: ClinicalTrials.gov public record
Updated Aug 31, 2023 · Synced Sep 5, 2026, 3:50 AM EDT
Completed Phase 2 Interventional Results available

TAK-228 Plus Tamoxifen in Patients With ER-Positive, HER2-negative Breast Cancer

NCT02988986
View directory record Official record
Conditions
Estrogen Receptor Positive Breast Cancer
Interventions
TAK-228, Tamoxifen
Drug
Lead sponsor
The Methodist Hospital Research Institute
Other
Eligibility
18 Years and older
Enrollment
28 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2017 – 2019
U.S. locations
3
States / cities
Houston, Texas • Sugar Land, Texas
Source: ClinicalTrials.gov public record
Updated Sep 21, 2021 · Synced Sep 5, 2026, 3:50 AM EDT
Withdrawn No phase listed Observational

Ductal Lavage in Assessing Women With Early Breast Cancer or at High Risk of Developing Breast Cancer and Who Are Eligible For Tamoxifen Therapy

NCT00083044
View directory record Official record
Conditions
Breast Cancer
Interventions
Not listed
Lead sponsor
Northwestern University
Other
Eligibility
18 Years to 64 Years · Female only
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2008
U.S. locations
2
States / cities
Birmingham, Alabama • Chicago, Illinois
Source: ClinicalTrials.gov public record
Updated Apr 24, 2012 · Synced Sep 5, 2026, 3:50 AM EDT
Terminated Phase 2 Interventional Results available

Oral Tamoxifen vs. TamGel vs. Control in Women With Atypical Hyperplasia, Lobular Carcinoma In Situ, or Increased Breast Cancer Risk

NCT04570956
View directory record Official record
Conditions
Breast Atypical Hyperplasia, Breast Lobular Carcinoma in Situ, Breast Atypical Lobular Hyperplasia, Breast Carcinoma
Interventions
Tamoxifen, Topical 4-OHT( 4-hydroxytamoxifen)gel 4 mg/each breast/day, Placebo, Questionnaire Administration
Drug · Other
Lead sponsor
Mayo Clinic
Other
Eligibility
18 Years to 80 Years · Female only
Enrollment
65 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2021 – 2024
U.S. locations
3
States / cities
Evanston, Illinois • Rochester, Minnesota • Camden, New Jersey
Source: ClinicalTrials.gov public record
Updated Aug 31, 2026 · Synced Sep 5, 2026, 3:50 AM EDT
Active, not recruiting Phase 2 Interventional Results available

A Study of Abemaciclib (LY2835219) Plus Tamoxifen or Abemaciclib Alone in Women With Metastatic Breast Cancer

NCT02747004
View directory record Official record
Conditions
Metastatic Breast Cancer
Interventions
Abemaciclib, Tamoxifen, Prophylactic Loperamide
Drug
Lead sponsor
Eli Lilly and Company
Industry
Eligibility
18 Years and older · Female only
Enrollment
234 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2016 – 2026
U.S. locations
5
States / cities
Tucson, Arizona • Lebanon, New Hampshire • Nashville, Tennessee + 2 more
Source: ClinicalTrials.gov public record
Updated Feb 5, 2026 · Synced Sep 5, 2026, 3:50 AM EDT
Completed Phase 2 Interventional

Phase II Metastatic ER+/PgR+ Nolvadex +/- Iressa Study

NCT00229697
View directory record Official record
Conditions
Breast Neoplasms
Interventions
Gefitinib, Tamoxifen
Drug
Lead sponsor
AstraZeneca
Industry
Eligibility
18 Years to 130 Years · Female only
Enrollment
317 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2003 – 2015
U.S. locations
4
States / cities
Berkeley, California • Palm Springs, California • St Louis, Missouri + 1 more
Source: ClinicalTrials.gov public record
Updated Oct 4, 2015 · Synced Sep 5, 2026, 3:50 AM EDT
Completed Phase 4 Interventional Accepts healthy volunteers Results available

Tamoxifen to Reduce Unscheduled Bleeding in New Users of the Levonorgestrel-releasing Intrauterine System (LNG-IUS)

NCT02824224
View directory record Official record
Conditions
Menorrhagia, Metrorrhagia, Medicated Intrauterine Devices
Interventions
Tamoxifen, Placebo (for Tamoxifen)
Drug
Lead sponsor
Oregon Health and Science University
Other
Eligibility
15 Years to 45 Years · Female only
Enrollment
42 participants
Healthy volunteers
Accepts healthy volunteers
Timeline
2016 – 2018
U.S. locations
1
States / cities
Portland, Oregon
Source: ClinicalTrials.gov public record
Updated Jun 3, 2019 · Synced Sep 5, 2026, 3:50 AM EDT
Completed Phase 2 Interventional Results available

Extended Endocrine Therapy for Premenopausal Women With Breast Cancer

NCT00903162
View directory record Official record
Conditions
Breast Cancer
Interventions
leuprolide, letrozole, zoledronic acid
Drug
Lead sponsor
Dana-Farber Cancer Institute
Other
Eligibility
18 Years and older · Female only
Enrollment
17 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2009 – 2014
U.S. locations
4
States / cities
Denver, Colorado • Boston, Massachusetts • Newton, Massachusetts
Source: ClinicalTrials.gov public record
Updated Apr 17, 2016 · Synced Sep 5, 2026, 3:50 AM EDT
Completed Phase 3 Interventional Results available

Randomized Phase III Study Of Exemestane (Aromasin) For 5 Years Versus Tamoxifen for 2.5 to 3 Years Followed By Exemestane

NCT00036270
View directory record Official record
Conditions
Breast Neoplasms
Interventions
exemestane (Aromasin), tamoxifen + exemestane
Drug
Lead sponsor
Pfizer
Industry
Eligibility
50 Years and older · Female only
Enrollment
9,779 participants
Healthy volunteers
Healthy volunteers not accepted
Timeline
2001 – 2011
U.S. locations
179
States / cities
Bessemer, Alabama • Birmingham, Alabama • Flagstaff, Arizona + 139 more
Source: ClinicalTrials.gov public record
Updated Oct 27, 2015 · Synced Sep 5, 2026, 3:50 AM EDT