What is Lung Cancer?

What is lung cancer?  Cancer cells that form in the tissues of the lung.Cancer that forms in tissues of the lung, usually in the cells lining air passage. 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 2012: New cases: 226,160, deaths: 160,340.[1]

[1] National Cancer Institute