Carcinoembryonic antigen, carbohydrate antigen (CEA), and neuron-specific enolase (NSE )are tumor markers related to presence of Lung cancer. The lung marker profile NSE, CEA test is done to diagnose and manage cancer. This also helps in finding out if the cancer treatment is working or not. Sometimes antigens, which are substance that is made by cancerous tumor cells, are released into the bloodstream. The CEA test measures the amount of CEA in the blood. A high amount of CEA in your body after a cancer treatment or surgery suggests the cancer is not gone. Smoking can increase the amount of CEA in your body even in the absence of cancer. You should tell your doctor if you smoke.