Cancer

Definition of lung cancer: Cancer that forms in tissues of the lung, usually in the cells lining air passages. The two main types are small cell lung cancer and non-small cell lung cancer. These types are diagnosed based on how the cells look under a microscope. Estimated new cases and deaths from lung cancer (non-small cell and small cell combined) in the United States in 2007: New cases: 213,380 Deaths: 160,390