 Stereotactic Body Radiotherapy SBRT for tumors in the thorax is a relatively new therapy in the United States, but has been used extensively in Japan for more than 10 years. This protocol seeks to enroll patients in three broad categories based on histology and clinical scenario: primary therapy for non-small-cell lung cancer NSCLC, primary therapy to thoracic metastases, and retreatment of previously irradiated tumors or lung. 