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Lung cancer is cancer that usually starts in the lining of the bronchi (the main airways of the lungs), but can also begin in other areas of the lungs, including the bronchioles, or alveoli. It is the leading cause of cancer death in both men and women. In 2016, about 224,000 new cases of lung cancer are expected, according to the American Cancer Society.

lung-cancer-screening

Lung cancers are believed to develop over a period of many years. Nearly all lung cancers are carcinomas, a cancer that begins in the lining or covering tissues of an organ. The tumor cells of each type of lung cancer grow and spread differently, and each type requires different treatment.