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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.
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, NY134 studies
- Houston, TX126 studies
- Boston, MA110 studies
- Nashville, TN79 studies
- Los Angeles, CA71 studies
- Edison, NJ69 studies
- St. Louis, MO64 studies
- Durham, NC63 studies
- Queens, NY63 studies
- Chicago, IL58 studies
- Philadelphia, PA56 studies
- Dallas, TX54 studies
Other studies in O'Fallon
- Obesity12 studies
- Overweight10 studies
- Prostate Cancer9 studies
- Major Depressive Disorder9 studies
- Non-Small Cell Lung Cancer8 studies
- Lung Cancer7 studies
- Acute Myeloid Leukemia6 studies
- Melanoma5 studies
- Colorectal Cancer5 studies
- Kidney Cancer (Renal Cell Carcinoma)5 studies
- Depression5 studies
- Chronic Lymphocytic Leukemia4 studies
From ClinicalTrials.gov, data retrieved Oct 1, 2026. Each study sets its own eligibility; the study team decides who can join.