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Breast Cancer clinical trials in O'Fallon, MO
6 studies for Breast Cancer are looking for participants at sites in and around O'Fallon (within about 30 miles). Open a study to see who can join and how to contact the study team.
Recruiting for a study here? Feature it at the top of this page — $99 for 30 days →
Collecting Blood Samples From Patients With and Without Cancer to Evaluate Tests for Early Cancer Detection
RecruitingObservational studyHealthy volunteers welcome
- Saint Luke's Hospital, Chesterfield · 12 mi away
- Mercy Oncology and Hematology - Clayton-Clarkson, Ballwin · 17 mi away
- Mercy Hospital Washington, Washington · 24 mi away
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
- Siteman Cancer Center at Saint Peters Hospital, City of Saint Peters · 4 mi away
- Mercy Oncology and Hematology - Clayton-Clarkson, Ballwin · 17 mi away
- Mercy Hospital Washington, Washington · 24 mi away
Testing Proton Craniospinal Radiation Therapy Versus the Usual Radiation Therapy for Leptomeningeal Metastasis, RADIATE-LM Trial
RecruitingPhase 3
- Siteman Cancer Center at Saint Peters Hospital, City of Saint Peters · 4 mi away
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
- Siteman Cancer Center - St Peters, City of Saint Peters · 4 mi away
Assessing Benefits and Harms of Cannabis/Cannabinoid Use Among Cancer Patients Treated in Community Oncology Clinics
RecruitingObservational study
- Mercy Oncology and Hematology - Clayton-Clarkson, Ballwin · 17 mi away
- Saint Louis Cancer and Breast Institute-Ballwin, Ballwin · 17 mi away
S1501 Dual Observational and Randomized Cohort Study of Patients With Metastatic HER-2+ Breast Cancer at Risk of Cardiac Toxicity
RecruitingPhase 3
- Saint Louis Cancer and Breast Institute-Ballwin, Ballwin · 17 mi away
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, NY136 studies
- Houston, TX126 studies
- Boston, MA112 studies
- Nashville, TN81 studies
- Los Angeles, CA73 studies
- Edison, NJ68 studies
- St. Louis, MO64 studies
- Queens, NY64 studies
- Durham, NC64 studies
- Chicago, IL59 studies
- Philadelphia, PA56 studies
- Dallas, TX55 studies
Other studies in O'Fallon
- Obesity11 studies
- Overweight10 studies
- Major Depressive Disorder9 studies
- Prostate Cancer9 studies
- Non-Small Cell Lung Cancer8 studies
- Lung Cancer7 studies
- Acute Myeloid Leukemia6 studies
- Depression5 studies
- Colorectal Cancer5 studies
- Melanoma5 studies
- Kidney Cancer (Renal Cell Carcinoma)5 studies
- Bipolar Disorder4 studies
From ClinicalTrials.gov, data retrieved Oct 6, 2026. Each study sets its own eligibility; the study team decides who can join.