This rare type of thyroid cancer has several forms, depending on the mutations that cause it. Most cases of medullary thyroid cancer, though, are sporadic—they occur without any family history of thyroid cancer.
Ninety percent of lung cancers are caused by smoking, but not everyone who smokes will develop lung cancer. Researchers believe that normal genetic variations, known as polymorphisms, may make some people more likely to develop lung cancer if they smoke.
The majority of cases of prostate cancer are sporadic, which means that one person in the family developed prostate cancer by chance at a typical age for this cancer. In these cases, other male relatives have little to no increased risk of developing prostate cancer.
Up to half of all Americans 65 and older will have at least one bout of skin cancer. The most common types of skin cancer in the United States are basal cell and squamous cell carcinomas. These are generally the result of sun exposure.
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