Individualized Stereotactic Body Radiotherapy of Liver Metastases

Stereotactic body radiation therapy (SBRT) is a technique that is used to deliver radiation, to sites in the body. All participants in this study will be treated with SBRT using proton beam radiation. Proton beam radiation uses tiny particles to deliver radiation to tumors. The purpose of this research study is to determine if SBRT with protons will prevent tumor growth and reduce the treatment side effects for liver metastases.