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Breast Cancer clinical trials in Seattle, WA
40 studies for Breast Cancer are looking for participants at sites in and around Seattle (within about 30 miles). Open a study to see who can join and how to contact the study team.
An Investigational Study of BG-75202 Alone and in Combination With Other Therapeutic Agents in Adults With Advanced Solid Tumors
RecruitingPhase 1
- Fred Hutchinson Cancer Research Center, Seattle
A Clinical Study of Sacituzumab Tirumotecan (Sac-TMT, MK-2870) in People With Breast Cancer (MK-2870-032)
RecruitingPhase 3
- Fred Hutchinson Cancer Center ( Site 0069), Seattle
ASPEN-09-03: A Study of Evorpacept in Combination With Trastuzumab and Chemotherapy in Metastatic HER2-Positive Breast Cancer
RecruitingPhase 2
- Fred Hutchinson Cancer Center, Seattle
Signatera-Guided CDK4/6 Inhibitor Therapy in Breast Cancer
Recruiting
- Fred Hutch Cancer Center, Seattle
A Study to Evaluate the Safety, Tolerability, Drug Levels, and Preliminary Efficacy of BMS-986507 Combinations in Adult Participants With Advanced Solid Tumors
RecruitingPhase 1/2
- Swedish Medical Center, Seattle
Palazestrant in Combination With Ribociclib for the First-line Treatment of ER+/HER2- Advanced Breast Cancer
RecruitingPhase 3
- Clinical Trial Site, Seattle
ARTIDIS Nanomechanical Generated Measurements for Early Breast Lesions
Recruiting
- University of Washington, Seattle
A Study of Tersolisib (LY4064809/STX-478) With Other Anti-Cancer Treatments in Participants With Advanced Breast Cancer With a Genetic Change (PIK3CA)
RecruitingPhase 3
- Swedish Medical Center, Seattle
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
RecruitingPhase 3
- Swedish Medical Center, Seattle
Beamion BCGC-1: A Study to Find a Suitable Dose of Zongertinib Used Alone and in Combination With Other Treatments to Test Whether it Helps People With Different Types of HER2+ Cancer That Has Spread
RecruitingPhase 1/2
- Fred Hutchinson Cancer Research Center, Seattle
The Evaluation of PC14586 in Patients With Advanced Solid Tumors Harboring a TP53 Y220C Mutation (PYNNACLE)
RecruitingPhase 1/2
- University of Washington, Fred Hutchinson Cancer Center, Seattle
A Study of Elacestrant Versus Standard Endocrine Therapy in Women and Men With ER+,HER2-, Early Breast Cancer With High Risk of Recurrence
RecruitingPhase 3
- Virginia Mason Medical Center, Seattle
- Swedish Cancer Institute, Seattle
- Fred Hutchinson Cancer Center, Seattle
- and 1 more
BGB-21447 (Bcl-2 Inhibitor) Combinations for Adults With Hormone-Receptor Positive (HR+)/Human Epidermal Growth Factor Receptor 2 Negative (HER2-) Metastatic Breast Cancer
RecruitingPhase 1
- Fred Hutchinson Cancer Research Center, Seattle
Open-Label Study of BBO-10203 in Subjects With Advanced Solid Tumors
RecruitingPhase 1
- Fred Hutchinson Cancer Center, Seattle
A Phase 1/1b Study of IAM1363 in HER2 Cancers
RecruitingPhase 1
- Fred Hutchinson Cancer Center, Seattle
A Study Evaluating the Efficacy and Safety of Inavolisib Plus CDK4/6 Inhibitor and Letrozole vs Placebo + CDK4/6i and Letrozole in Participants With Endocrine-Sensitive PIK3CA-Mutated, Hormone Receptor-Positive, HER2-Negative Advanced Breast Cancer
RecruitingPhase 3
- Swedish Cancer Institute - Issaquah, Seattle
- Swedish Cancer Institute, Seattle
Evaluating the Addition of Adjuvant Chemotherapy to Ovarian Function Suppression Plus Endocrine Therapy in Premenopausal Patients With pN0-1, ER-Positive/HER2-Negative Breast Cancer and an Oncotype Recurrence Score Less Than or Equal to 25
RecruitingPhase 3
- Virginia Mason Medical Center, Seattle
- Swedish Medical Center-Ballard Campus, Seattle
- Fred Hutchinson Cancer Center, Seattle
- and 5 more
Collecting Blood Samples From Patients With and Without Cancer to Evaluate Tests for Early Cancer Detection
RecruitingObservational studyHealthy volunteers welcome
- Swedish Medical Center-Ballard Campus, Seattle
- Swedish Medical Center-Cherry Hill, Seattle
- Swedish Medical Center-First Hill, Seattle
- and 1 more
Study of ECI830 Single Agent or in Combination in Patients With Advanced HR+/HER2- Breast Cancer and in Patients With Other Advanced Solid Tumors
RecruitingPhase 1/2
- Fred Hutch Cancer Research, Seattle
Hippocampal Avoidance in Craniospinal Irradiation for the Treatment of Leptomeningeal Metastases From Breast Cancer or Non-small Cell Lung Cancer
RecruitingPhase 2
- Fred Hutch/University of Washington Cancer Consortium, Seattle
Axillary Radiotherapy or Axillary Lymph Node Dissection in Patients With Clinically Node- Positive Breast Cancer Undergoing Upfront Tailored Axillary Surgery
Recruiting
- Swedish Cancer Institute, Seattle
Rinatabart Sesutecan (Rina-S, PRO1184, GEN1184) for Advanced Solid Tumors (GCT1184-01/ PRO1184-001)
RecruitingPhase 1/2
- Swedish Cancer Institute, Seattle
E-Mindfulness Approaches for Living After Breast Cancer
RecruitingPhase 3
- Saint Joseph Medical Center Hematology and Oncology - Silverdale, Silverdale · 17 mi away
Phase I Study of [177Lu]Lu-NNS309 in Patients With Pancreatic, Lung, Breast and Colorectal Cancers
RecruitingPhase 1
- University Of Washington, Seattle
A Study to Assess the Efficacy and Safety of FORE8394 in Participants With Cancer Harboring BRAF Alterations
RecruitingPhase 2
- University of Washington School of Medicine, Seattle
A Study of Emiltatug Ledadotin (Emi-Le) in Participants With Solid Tumors
RecruitingPhase 1/2
- Fred Hutchinson Cancer Center, Seattle
Phase 1/2 Study of ETX-636 in Participants With Advanced Solid Tumors
RecruitingPhase 1/2
- Fred Hutchinson Cancer Center, Seattle
[18F]FTT Positron Emission Tomography for the Measurement of PARP Tumor Expression in Patients With Metastatic Breast Cancer
RecruitingPhase 1/2
- Fred Hutch/University of Washington Cancer Consortium, Seattle
Phase 3 Study of Gedatolisib as First-Line Treatment for Patients With HR-Positive, HER2-Negative Advanced Breast Cancer (VIKTORIA-2)
RecruitingPhase 3
- Fred Hutchinson Cancer Center, Seattle
A Study Evaluating the Safety, Pharmacokinetics and Early Efficacy of AVA6000 in Solid Tumours
RecruitingPhase 1
- Fred Hutchinson Cancer Center, Seattle
A Study to Learn About the Study Medicine Called PF-07248144 in Combination With Fulvestrant in People With HR-positive, HER2-negative Advanced or Metastatic Breast Cancer Who Progressed After a Prior Line of Treatment.
RecruitingPhase 3
- Fred Hutchinson Cancer Center, Seattle
De-Escalation of Breast Radiation Trial for Hormone Sensitive, HER-2 Negative, Oncotype Recurrence Score Less Than or Equal to 18 Breast Cancer (DEBRA)
RecruitingPhase 3
- Swedish Medical Center-Ballard Campus, Seattle
- Swedish Medical Center-First Hill, Seattle
- Saint Michael Cancer Center, Silverdale · 17 mi away
Quantitative MRI Assessment of Breast Cancer Therapy Response
RecruitingObservational study
- University of Washington, Seattle
Avelumab or Hydroxychloroquine With or Without Palbociclib to Eliminate Dormant Breast Cancer
RecruitingPhase 2
- University of Washington, Seattle
A Study of PARG Inhibitor ETX-19477 in Patients With Advanced Solid Malignancies
RecruitingPhase 1/2
- Fred Hutchinson Cancer Center, Seattle
Assessing Benefits and Harms of Cannabis/Cannabinoid Use Among Cancer Patients Treated in Community Oncology Clinics
RecruitingObservational study
- Kaiser Permanente Washington, Seattle
- Swedish Medical Center-First Hill, Seattle
A Study of CLSP-1025 in Adult Patients With Solid Tumors That Harbor the p53 R175H Mutation
RecruitingPhase 1
- Fred Hutchinson Cancer Center, Seattle
SYNERGY-AI: Artificial Intelligence Based Precision Oncology Clinical Trial Matching and Registry
RecruitingObservational study
- Massive Bio SYNERGY-AI site, Seattle
S1501 Dual Observational and Randomized Cohort Study of Patients With Metastatic HER-2+ Breast Cancer at Risk of Cardiac Toxicity
RecruitingPhase 3
- FHCC South Lake Union, Seattle
- Swedish Medical Center-First Hill, Seattle
- University of Washington Medical Center - Montlake, Seattle
MammaPrint, BluePrint, and Full-genome Data Linked With Clinical Data to Evaluate New Gene EXpression Profiles
RecruitingObservational study
- Swedish Cancer Institute, Seattle
- Seattle Cancer Care Alliance, Seattle
About Breast Cancer
Breast cancer is a cancer that starts in the breast tissue, when cells change and grow out of control. These extra cells can form a mass called a tumor.
More about Breast Cancer on MedlinePlus
Breast Cancer trials in other cities
- New York City, NY134 studies
- Houston, TX126 studies
- Boston, MA110 studies
- Nashville, TN79 studies
- Los Angeles, CA71 studies
- Edison, NJ69 studies
- St. Louis, MO65 studies
- Queens, NY63 studies
- Durham, NC63 studies
- Chicago, IL58 studies
- Philadelphia, PA56 studies
- Dallas, TX54 studies
Other studies in Seattle
- Non-Small Cell Lung Cancer53 studies
- Cancer (all types)50 studies
- Prostate Cancer44 studies
- Acute Myeloid Leukemia40 studies
- Metastatic Cancer39 studies
- Colorectal Cancer34 studies
- Lung Cancer33 studies
- Ovarian Cancer31 studies
- Multiple Myeloma22 studies
- Pancreatic Cancer22 studies
- Myelodysplastic Syndromes21 studies
- Bladder Cancer21 studies
From ClinicalTrials.gov, data retrieved Sep 29, 2026. Each study sets its own eligibility; the study team decides who can join.