 - Intrathoracic lung carcinoma of squamous cell histology. Mixed tumors will be categorized by the predominant cell type unless small cell elements are present, in which case the patient is ineligible; sputum cytology alone is acceptable for inclusion. Subjects with extrathoracic-only squamous cell NSCLC are eligible. Subjects with only peripheral lung lesions of any NSCLC histology will also be eligible. A peripheral lesion is defined as a lesion in which the epicenter of the tumor is 2 cm from the costal or diaphragmatic pleura in a three-dimensional orientation based on each lobe of the lung and is 2 cm from the trachea, main and lobar bronchi. 