Medullary Thyroid Cancer

Increased genetic knowledge has also changed our approach to thyroid cancer. Medullary thyroid cancer (MTC) is a well-established component of multiple endocrine neoplasia syndrome type 2a (MEN 2a) or type 2b (MEN 2b). Previously, family members at risk for MEN 2 underwent annual screening for elevated calcitonin levels; however, this only detected MTC after it developed. In 1993 it was identified that mutations in the RET proto-oncogene were present in almost all cases of MEN 2a and 2b. Now family members of MEN patients can be screened for the presence of a RET mutation. Those without the mutation need not undergo additional screening, whereas those with the mutation should undergo total thyroidectomy at a young age (6 years for MEN 2a, infancy for MEN 2b).49

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