Multiple endocrine neoplasia type 2

Current Treatment Options in Oncology
Michael E Gertner, Electron Kebebew

Abstract

Multiple endocrine neoplasia type 2 (MEN-2) is a hereditary syndrome that is transmitted in an autosomal dominant pattern. MEN-2A, MEN-2B, and familial medullary thyroid cancer (MTC) comprise the MEN-2 syndrome. A germline mutation in the RET proto-oncogene is responsible for the MEN-2 syndrome. Recent data indicate that in 99% of MEN-2 cases, a germline RET mutation can be identified by genetic testing. The phenotypic variation of MEN-2 is diverse and partly related to the codon and specific point mutation in the RET proto-oncogene. There are increasing data on the genotype-phenotype correlations in patients with MEN-2 and this information should be used for screening at-risk patients and treatment of RET mutation carriers. All patients (especially if young) with MTC or bilateral pheochromocytoma should have a careful family history taken and genetic screening for RET germline mutations. Patients who are RET germline mutation carriers but without clinical or biochemical evidence of MTC should have a prophylactic total thyroidectomy. The optimal age of thyroidectomy should be based on the RET genotype (eg, high-risk mutations within the first year of life, intermediate-risk mutations by 5 years of age, and low-risk mutations by...Continue Reading

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