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Clinical trials in O'Fallon, MO
183 clinical studies are recruiting at sites in and around O'Fallon (within about 30 miles).
Studies for healthy volunteers in O'Fallon — 12 studies
Studies by condition
- Obesity12 studies
- Overweight10 studies
- Major Depressive Disorder9 studies
- Prostate Cancer9 studies
- Non-Small Cell Lung Cancer8 studies
- Lung Cancer7 studies
- Breast Cancer6 studies
- Acute Myeloid Leukemia6 studies
- Kidney Cancer (Renal Cell Carcinoma)5 studies
- Colorectal Cancer5 studies
- Melanoma5 studies
- Depression5 studies
- Chronic Lymphocytic Leukemia4 studies
- Laryngeal Cancer4 studies
- Oral Cancer4 studies
- Ulcerative Colitis4 studies
- Colon Cancer4 studies
- Bipolar Disorder4 studies
- Treatment-Resistant Depressive Disorder3 studies
- Urothelial (Transitional Cell) Carcinoma3 studies
- Bladder Cancer3 studies
- Brain Tumors3 studies
- Chronic Kidney Disease3 studies
- Head and Neck Squamous Cell Carcinoma3 studies
- Hypopharyngeal Cancer3 studies
- Knee Osteoarthritis3 studies
- Blood Cancers3 studies
- Schizophrenia3 studies
- Rectal Cancer3 studies
- Metastatic Cancer3 studies
- Type 2 Diabetes3 studies
- Ovarian Cancer3 studies
From ClinicalTrials.gov, data retrieved Sep 30, 2026. Each study sets its own eligibility; the study team decides who can join.