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    What Is Non-Small-Cell Lung Cancer (NSCLC)?

    Most people who have lung cancer have NSCLC. Although it's serious, treatment can sometimes cure it or stop it from getting worse. There are things you can do to help you feel better, too.

    People who smoke or who breathe a lot of smoke are most likely to get NSCLC. Many of them are over 65.

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    Understanding Lung Cancer -- the Basics

    Although lung cancer is the leading cause of cancer death in the U.S. in both men and women, it is also one of the most preventable kinds of cancer. At least four out of five cases are associated with cigarette smoking, and the cause-and-effect relationship has been extensively documented. During the 1920s, large numbers of men began to smoke cigarettes, presumably in response to increased advertising. Twenty years later, the frequency of lung cancer in men climbed sharply. In the 1940s, significantly...

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    There are three kinds of NSCLC tumors:

    1. Adenocarcinoma starts in cells in your air sacs that make mucus and other substances, often in the outer parts of your lungs. It's the most common kind of lung cancer among both smokers and nonsmokers and people under 45. It often grows more slowly than other lung cancers.

    2. Squamous cell (epidermoid) carcinoma starts in cells that line the inner airways of the lungs. About a quarter of lung cancers are this kind.

    3. Large cell (undifferentiated) carcinoma grows and spreads more quickly. That can make it tougher to treat. It's about 10% to 15% of lung cancers.

    The treatments your doctor suggests will depend on how far your cancer has spread.

    Causes

    Doctors aren't sure exactly what causes this disease. Many people who get it have smoked or been around smoke. Other things that make lung cancer more likely are:

    • Radon, a radioactive gas found naturally in soil and rocks
    • Asbestos
    • Mineral and metal dust
    • Air pollution
    • Radiation treatment to your chest or breast
    • HIV/AIDS

    It can also run in families.

    Symptoms

    You may not notice symptoms in the early stages. Or you might mistake them for another illness, such as pneumonia or a collapsed lung.

    Like other types of lung cancer, symptoms can include:

    If the cancer spreads to other parts of the body, you may have:

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