In 2006, about 1.4 million new cancers were diagnosed in the United States. This includes 1 million non-melanomatous skin cancers. Almost 10 million Americans are alive today with a diagnosis of cancer. The likelihood that any given person has a family history of cancer is, therefore, quite high. The majority of these cases are due to complex environmental factors or chance. However, in 5-10% of cases this is due to a heritable familial cancer syndrome.
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