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Lung Cancer Lung cancer is a carcinoma that develops in the epithelial cells that form the interior lining to the lungs The airways get the most exposure to inhaled pollutants thus most people who get lung cancer are smokers Lung cancer is not just one disease There are many types of cancer that form in the lungs most of which you can only see through a microscope The most common cancer of the lungs is epidermoid It is also known as squamous carcinoma because its cells look like a flat surface called a squamous cell This cancer produces keratin a substance found in skin and hair which can be seen in a tumor Squamous carcinoma is more common in smokers because it develops in the bronchi and spreads by invading local tissues than to the lymph nodes and into the blood Large - cell carcinoma is a tumor that is fairly larger than other types They dont form keratin but they are common in smokers They develop in the central or peripheral part of the lungs and the lymph glands Small cell carcinoma tumors are small and fragile They are divided into groups by their shapes The term oat cell carcinoma is used to develop in smokers and usually in the central part of the lung They spread by the lymph glands and into the blood stream early This type of tumors can only be seen through an electron microscope on high magnification A rare type of lung cancer which develops from hormone producing cells are carcinoid tumors They have a much less malignant course than small cell carcinoma Lung cancer has been blamed on many factors but the most important is smoking Smoking is the main cause of lung cancer The more often and longer a person smokes increases there chances of lung cancer Cigarrettes are supposed to releive stress and depression thirst and hunger In reality they
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