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Germline and somatic mutations of the RET proto-oncogene in apparently sporadic medullary thyroid carcinomas

C Scurini1, L Quadro, O Fattoruso

  • 1Istituto di Endocrinologia, Facoltà di Medicina, Seconda Università di Napoli, Italy.

Molecular and Cellular Endocrinology
|June 2, 1998
PubMed

Insights

Genetic analysis of RET proto-oncogene mutations in 50 medullary thyroid carcinoma (MTC) patients revealed germline mutations in three cases, indicating familial MTC. Somatic mutations were found in 30% of patients, suggesting sporadic MTC.

Area of Science:

  • Oncology
  • Genetics
  • Endocrinology

Background:

  • Medullary thyroid carcinoma (MTC) can be sporadic or familial, linked to multiple endocrine neoplasia (MEN) type 2 syndromes.
  • Accurate diagnosis is crucial as familial and sporadic MTC require different clinical management strategies.
  • The RET proto-oncogene is frequently implicated in MTC development.

Purpose of the Study:

  • To identify germline and somatic RET proto-oncogene mutations in patients clinically diagnosed with sporadic MTC.
  • To differentiate between familial and sporadic MTC cases for appropriate patient and family management.
  • To determine the frequency of RET mutations in a cohort of MTC patients.

Main Methods:

  • Analysis of RET proto-oncogene mutations in 50 patients diagnosed with sporadic MTC.
  • Sequencing of specific exons (11, 14, and 16) of the RET gene.
  • Correlation of mutation status with clinical diagnosis and family history.

Main Results:

  • Germline RET mutations were identified in three patients (6%), confirming familial MTC.
  • Somatic RET mutations were detected in eight patients (30%), consistent with sporadic MTC.
  • Specific mutations included exon 11 and 14 alterations for germline, and codon 918 (exon 16) or codon 634 (exon 11) for somatic mutations.

Conclusions:

  • Genetic testing for RET mutations can distinguish familial from sporadic MTC in clinically diagnosed sporadic cases.
  • Identification of germline mutations necessitates evaluation of family members.
  • A tailored genetic and clinical management approach is recommended based on MTC inheritance patterns.

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