Inclusion Criteria:  Age ≥ 18 years of age Clinical diagnosis of NSCLC Stage T1-2b (≤ 5 cm)  Exclusion Criteria:  Prior invasive malignancy (except non-melanomatous skin cancer) unless disease free for a minimum of 1 year (i.e., carcinomas in situ of the breast, oral cavity, or cervix are permissible); previous lung cancer, if the patient is disease-free for a minimum of 1 year is permitted; Prior radiotherapy to the region of the study cancer that would result in overlap of radiation therapy fields Prior chemotherapy for the study cancer Plans for the patient to receive other local therapy (including standard fractionated radiotherapy and/or surgery) while on this study, except at disease progression Plans for the patient to receive systemic therapy (including standard chemotherapy or biologic targeted agents), while on this study, except at disease progression