Stereotactic Body Radiation Therapy in Treating Patients With Localized High-Risk Prostate Cancer

This clinical trial studies stereotactic body radiation therapy in treating patients with high-risk prostate cancer that has not spread to nearby lymph nodes or to other parts of the body. Stereotactic body radiation therapy is a specialized radiation therapy that delivers a single, high dose of radiation directly to the tumor and may kill more tumor cells and cause less damage to normal tissue. Studying quality of life in patients undergoing stereotactic body radiation therapy may help identify the long-term effects of treatment on patients with prostate cancer.