About Pricing FAQs Providers Trials Blog

Login Get started

Finding studies

Your health journey, clearly organized.

Questions? feedback@clareohealth.com

Product

How it works
Pricing
For Providers
Trials

Company

About
Blog
FAQ

Legal

Privacy Policy
Terms of Service

© 2026 Clareo Health. All rights reserved.

Clareo Health | Breast Cancer Clinical Trials in Seattle | 547 Studies

Clinical Trials Breast CancerSeattle

Breast Cancer Clinical Trials in Seattle

Find 547 clinical trials for breast cancer near Seattle, Washington. Connect with research centers in your area.

All Breast Cancer trials nationwide All trials in Seattle

Order

Status

RecruitingNot yet recruitingActive, not recruitingEnrolling by invitationCompletedTerminated

Phase

Early phase 1Phase 1Phase 1–2Phase 2Phase 2–3Phase 3Phase 4No phase

Who can join

Healthy volunteers too

Showing 101-120 of 547 trials

RecruitingA Study of Tersolisib (LY4064809/STX-478) With Other Anti-Cancer Treatments in Participants With Advanced Breast Cancer With a Genetic Change (PIK3CA)The purpose of the study is to assess the efficacy and safety of the addition of Tersolisib (LY4064809/STX-478) to other anti-cancer drugs as first treatment for advanced hormone…NCT07174336·Anchorage, Alaska and 360 others

Breast Cancer Trials in Other Cities

New York Los Angeles Chicago Houston Phoenix Philadelphia

Data from ClinicalTrials.govTerms

Active not recruitingUnderstanding and Predicting Breast Cancer Events After TreatmentThis study is being done to see if patients receiving chemotherapy for breast cancer affects the heart, the ability to exercise and fatigue when compared to patients who do not…NCT02791581·Birmingham, Alabama and 65 others

TerminatedClinical Utility of FES F18 PET/CT in Metastatic Breast Cancer PatientsThis is a phase 4, multi-center, open-label, prospective cohort study to evaluate the clinical utility of Fluoroestradiol F18 (Cerianna) PET/CT to guide therapeutic management in…NCT05068726·Flagstaff, Arizona and 23 others

UnknownER+/HER2- Locally Advanced or Metastatic Breast Cancer (ENZENO Study)For patients with ER-positive, HER2-negative breast cancer, blockage of the ER pathway has been proven to be an effective anticancer approach.NCT04669587·Seattle, Washington and 7 others

CompletedStudy of Letrozole With or Without BYL719 or Buparlisib, for the Neoadjuvant Treatment of Postmenopausal WomenThe purpose of the study was to determine whether treatment with a PI3K inhibitor plus letrozole led to an increase in pathologic clinical response and Objective Response Rate…NCT01923168·Birmingham, Alabama and 85 others

TerminatedAspirin in Preventing Recurrence of Cancer in Patients With HER2 Negative Stage II-III Breast Cancer After Chemotherapy, Surgery, and/or Radiation TherapyThis randomized phase III trial studies how well aspirin works in preventing the cancer from coming back (recurrence) in patients with human epidermal growth factor receptor 2…NCT02927249·Birmingham, Alabama and 1451 others

CompletedA Study of Palbociclib (PD-0332991) + Letrozole vs. Letrozole For 1st Line Treatment Of Postmenopausal Women With ER+/HER2- Advanced Breast Cancer (PALOMA-2)The study is designed to compare the clinical benefit following treatment with letrozole in combination with PD-0332991 versus letrozole in combination with placebo in…NCT01740427·Bellflower, California and 304 others

CompletedWeekly Vinorelbine and Oral Capecitabine as Treatment for Stage IV Breast CancerThe primary purpose of the study is to examine the safety and effectiveness of combination therapy consisting of daily oral capecitabine and weekly intravenous vinorelbine in…NCT00194727·Seattle, Washington

RecruitingRemotely Delivered, Community-Aligned Weight Loss Interventions Among Breast Cancer Survivors, ¡Vida! TrialThis clinical trial evaluates remotely delivered, community-aligned weight loss interventions in Latina breast cancer survivors.NCT05930483·Seattle, Washington

TerminatedF-18 FES PET/CT in Measuring Hormone Expression in Patients With Primary, Recurrent, or Metastatic Breast Cancer Undergoing Endocrine-Targeted TherapyThis clinical trial studies use of F-18 16 alpha-fluoroestradiol (\[F-18\] FES) positron emission tomography (PET)/computed tomography (CT) in measuring tumor hormone receptor…NCT02149173·Seattle, Washington

Active not recruitingSTOP-HER2: Stopping Trastuzumab in HER2+ MBCThis study is being done to see if anti-HER2 treatment be safely stopped in patients with HER2-positive metastatic breast cancer (MBC) that have had exceptional response to…NCT05721248·Phoenix, Arizona and 12 others

Active not recruiting(Z)-Endoxifen for the Treatment of Premenopausal Women With ER+/HER2- Breast CancerThis open-label research study is studying (Z)-endoxifen as a possible treatment for pre-menopausal women with ER+/HER2- breast cancer.NCT05607004·Phoenix, Arizona and 13 others

CompletedPost Market Study Using the Xoft Axxent SystemThe purpose of this multi-center clinical study is to compile post market performance and safety data on the Axxent System.NCT01017549·San Mateo, California and 9 others

RecruitingDe-Escalation of Breast Radiation Trial for Hormone Sensitive, HER-2 Negative, Oncotype Recurrence Score Less Than or Equal to 18 Breast Cancer (DEBRA)This Phase III Trial evaluates whether breast conservation surgery and endocrine therapy results in a non-inferior rate of invasive or non-invasive ipsilateral breast tumor…NCT04852887·Birmingham, Alabama and 831 others

CompletedVorinostat in Treating Patients With Stage IV Breast Cancer Receiving Aromatase Inhibitor TherapyThis pilot clinical trial studies vorinostat in treating patients with stage IV breast cancer receiving aromatase inhibitor (AI) therapy.NCT01153672·Seattle, Washington

CompletedPhase II Study of Fluorine-18 3'-Deoxy-3'-Fluorothymidine (F-18-FLT) in Invasive Breast CancerThis phase II trial studies how well 3'-deoxy-3'-18F fluorothymidine (18F-FLT) positron emission tomography (PET)/computed tomography (CT) works in predicting response in patients…NCT00572728·Scottsdale, Arizona and 26 others

TerminatedGenetically Modified T-Cell Therapy in Treating Patients With Advanced ROR1+ MalignanciesThis phase I trial studies the side effects and best dose of genetically modified T-cell therapy in treating patients with receptor tyrosine kinase-like orphan receptor 1 positive…NCT02706392·Seattle, Washington

RecruitingPhase 1/2 Study of ETX-636 in Participants With Advanced Solid TumorsPhase 1/2, open-label study of ETX-636 in participants with advanced solid tumorsNCT06993844·Newport Beach, California and 14 others

CompletedVaccine Therapy in Preventing Cancer Recurrence in Patients With Non-Metastatic, Node Positive, HER2 Negative Breast Cancer That is in RemissionThis phase I trial studies the side effects and best dose of a vaccine therapy in preventing cancer from coming back in patients with non-metastatic, node positive, human…NCT02780401·Seattle, Washington and 1 other

CompletedStandard Follow-up Compared With Extended Follow-up in Treating Patients Who Have Undergone Stem Cell Transplantation for CancerRATIONALE: Telephone counseling by trained counselors may enhance the well-being and quality of life of patients who have undergone stem cell transplantation for cancer.NCT00049465·Stanford, California and 8 others

PreviousPage 6 of 28Next

Other Conditions in Seattle

Lung Cancer Prostate Cancer Colorectal Cancer Melanoma Leukemia Lymphoma