I. To determine whether ASA (acetylsalicylic acid) 325 mg inhibits prostaglandin E2 (PGE2) biosynthesis in patients with early stage non-small cell lung cancer (NSCLC). Cyclooxygenase (COX) catalytic activity will be determined by measuring the metabolite of PGE2, 11alpha-hydroxy-9,12-dioxo-2,3,4,5-tetranor-prostane-1,20 dioic acid (PGE-M) in urine pre- and post-ASA 325 mg as a surrogate of systemic PGE2 biosynthesis.