Lung cancer may start either in the bronchus or other parts of the lung. Later, it may spread to lymph nodes, the brain, or other parts of the body, and cancers from other organs may also spread to the lung. Lung cancer is mainly two types: small-cell lung cancer and non-small-cell lung cancer. Small cell lung cancer has two types: small cell carcinoma (oat cell cancer) and combined small cell carcinoma. Non-small cell lung cancer can be of three types, adenocarcinoma, squamous cell carcinoma, a...
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