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Multiple endocrine neoplasia(MEN) I is an inherited disorder in which one or more of the endocrine glands are overactive or form a tumor. Endocrine glands most commonly involved include:.MEN I is caused by a defect in a gene called RET.
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Certain factors can make one person more likely to get a pituitary tumor than another person. These are called risk factors. In some cancers, doctors have identified risk factors that can be avoided, such as smoking or sun exposure. With pituitary tumors, doctors are not sure what exactly causes pituitary tumors and only one risk factor has been identified. Most people who get a pituitary tumor have no known risk factors.
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