Lung cancer is not a single disease process but is a group of biologically variable diseases. Therefore, accurate and complete diagnosis along with complete workup of the patient prior to decision-making in treatment is essential to devise the most appropriate treatment strategy. In North America adenocarcinoma of the lung now accounts for about 40% of all lung cancers and stage for stage these tumors have a poorer prognosis than squamous cell cancers of the lung. Many prognostic indicators have been identified such as genetic markers and neuroen docrine differentiation, which have important...