Cancer occurs when cells in the body multiply wildly and abnormally. It is a serious, frightening disease. Cancer can occur in almost any part of the human body. Most often cancers attack middle-aged and older adults, but some kinds of cancer may strike at any age. Cancer affects people all over the world. Though not contagious, it is a common disease. More than 10 million new cases are diagnosed each year, and more than half of these victims will die from the disease. In the United States cancer is the second leading cause of death, exceeded only by heart disease. More than half a million Americans die of cancer each year. At some time in their lives, almost everyone in the country will be touched by the disease—either through their own illness or that of someone they love.

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