- 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.Patients with extrathoracic-only squamous cell NSCLC are eligible.Patients 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).