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Understanding Cancer: A Guide for Teens Cancer is a term that covers a broad range of diseases which all involve the process of cells in the body growing out of control. Normally, cells grow, divide, and produce more cells as they are needed to keep the body healthy. But sometimes, this orderly process goes wrong. Cells become abnormal, old or damaged cells survive when they should die, and new cells form when they are not needed. These extra cells can divide without stopping and may form what is known as tumours. Types and Causes of Cancer There are more than...