Stereotactic Body Radiotherapy and Radiofrequency Ablation for Lung Tumors Near Central Airways

Inclusion Criteria: * Histologically confirmed primary lung cancer, lung metastasis from another primary, or recurrent tumors in the setting of prior RFA or cryotherapy * Tumors \< 2 cm from trachea or zone of proximal bronchial tree (central tumors) * Each tumor \< 5 cm in size prior to treatment * Medically inoperable patients as determined at the multidisciplinary thoracic tumor board, or medically operable patients who refuse surgery * Criterion for medical inoperability include: * Overall clinical assessment at the UCLA thoracic tumor board * Reduced Pulmonary Function (FEV1, DLCO, etc) based on one major or two minor criterion as described below: * Modified ACOSOG Criteria for medical inoperability: * Major Criteria: FEV1% \< 50% or \< 1L and DLCO \< 50% * Minor Criteria: Age \> 75, FEV1 51-60% predicted, or FEV1 1-1.2L, DLCO 51%-60% predicted, pulmonary hypertension, poor left ventricular function (EF \< 40% or less), resting or exercise arterial pO2 \< 55 mmHg, and pCO2 \> 45 mmHg * Age \> 18 years old * KPS \> 70 * If a woman is of childbearing potential, a negative urine or serum pregnancy test must be documented. * Ability to understand and the willingness to sign a written informed consent Exclusion Criteria: * Prior thoracic radiation near the targets of interest * More than 2 central tumor targets per patient * Active infections requiring systemic antibiotics