What is Lung Cancer?

Lung cancer is the second most common form of cancer in both men and women and the leading cause of cancer-related deaths in the United States.

There are two main types of lung cancer:

In the United States, 80 to 85 percent of lung cancers are non-small cell lung cancers (NSCLC). The difference between NSCLC and small cell lung cancer (SCLC) involves the appearance of the cells under the microscope and their origin, how quickly each type spreads to other parts of the body, and how each tumor type responds to treatment.

Updated March 11, 2015