In this study prostaglandin-endoperoxide synthase 2 (PTGS2) and cytochrome P450, family 2, subfamily E, polypeptide 1 (CYP2E1) were selected as candidate genes susceptible to lung cancer based on their critical involvement in the mechanism of lung carcinogenesis [3], [4]. The gene discussed is CYP2E1; the disease is lung carcinoma.