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cancer
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Cancer Cancer occurs when cells in a part of the body begin to grow out of control. Normal cells divide and grow in an orderly fashion, but cancer cells do not. They continue to grow and crowd out normal cells. Although there are many kinds of cancer, they all have in common this out-of-control growth of cells. Different kinds of cancer can behave very differently. For example, lung cancer and colorectal cancer are very different diseases. They grow at different rates and respond to different treatments. That's why people with cancer need treatment that is aimed at their kind of cancer. Even when cancer has spread to a new place in the body, it is still named after the part of the body where it started. For example, if prostate cancer spreads to the bones, it is still called prostate cancer. If breast cancer spreads to the lungs, it is still breast cancer. When cancer comes back in a person who appeared to be free of the disease after treatment, it is called a recurrence. Lung cancer is an uncontrolled growth of abnormal cells in one or both of the lungs. The body is made up of different types of cells that normally divide and multiply in an orderly way. These new cells replace older cells. This process of cell birth and renewal occurs constantly in the body.
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