Thermal Ablation Combined With External Beam Radiation Therapy for Patients With Inoperable Non-Small Cell Lung Cancer > 3.5 cm in Size

Inclusion Criteria: * Patients with AJCC sixth edition Stage Ib or II non-small-cell lung cancer with cytology or biopsy proven disease and a minimum tumor size of 3.5 cm are eligible. * To be considered node negative for N2 disease, patients will have mediastinal lymph nodes ≤ 1.5 cm and no clinically suspicious uptake on FDG PET in those areas. * All patients are required to have been evaluated by a thoracic surgeon and have either refused surgery or been deemed medically inoperable due to co-morbid conditions. * The CT images of the chest must be reviewed by an experienced interventional radiologist and the target lesion is determined to be in a location where RFA is technically achievable based on the proximity of adjacent organs and structures. * Age ≥ 18 years old * Performance Status 0-2 (ECOG) Exclusion Criteria: * History of prior malignancy within the past 2 years except for curatively treated basal cell carcinoma of the skin, cervical intra-epithelial neoplasia, T1N0 squamous cell carcinoma of the larynx, or localized prostate cancer with a current PSA of \< 1.0 mg/dL on 2 successive evaluations, at least 3 months apart, with the most recent evaluation no more than 4 weeks prior to entry * Previous chest radiation to the region of interest. * Pregnant or lactating women. * A clinical diagnosis of bronchoalveolar carcinoma (BAC) will be made for patients in whom tissue diagnosis is by cytology alone with adenocarcinoma shown and the following radiographic criteria are met.