This PDQ cancer information summary for health professionals provides comprehensive, peer-reviewed, evidence-based information about the genetics of medullary thyroid cancer. This summary is reviewed regularly and updated as necessary by the Cancer Genetics Editorial Board.

The following information is included in this summary:

• Family history and other risk factors for medullary thyroid cancer
• Major genes associated with medullary thyroid cancer risk
• Genetic testing, screening and risk modification for hereditary medullary thyroid cancer
• Psychosocial issues associated with hereditary medullary thyroid cancer and genetic testing

The summary also contains level-of-evidence designations. These designations are intended to help readers assess the strength of the evidence in relation to specific studies or strategies. A description of how level-of-evidence designations are made is described in detail in the PDQ summary Cancer Genetics Overview.

This summary is intended to provide clinicians a framework for discussing genetic testing, screening, and risk modification options with individuals at risk for medullary thyroid cancer, as well as for making referrals to cancer risk counseling services. It does not provide formal guidelines or recommendations for making health care decisions. Information in this summary should not be used as a basis for reimbursement determinations.

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