Genotype-specific development of MEN 2 constituent components in 683 RET carriers

Area of Science:

• Endocrinology
• Genetics
• Oncology

Background:

• Multiple endocrine neoplasia type 2 (MEN 2) is a hereditary disorder caused by germline mutations in the rearranged during transfection (RET) proto-oncogene.
• The age-specific development of MEN 2's three main components—medullary thyroid cancer (MTC), pheochromocytoma, and primary hyperparathyroidism—is not fully understood for many of the >30 identified RET mutations.

Purpose of the Study:

• To characterize the age-specific development of MEN 2 components based on specific RET germline mutation genotypes.
• To establish genotype-specific disease manifestation corridors for improved risk stratification and surveillance strategies in RET carriers.

Main Methods:

• A genetic association study involving 683 carriers of various RET germline mutations, categorized by mutation risk (highest, high, intermediate, low).
• Analysis of age-specific disease onset and progression for MTC, pheochromocytoma, and primary hyperparathyroidism across different RET mutation groups.

Main Results:

• A strong genotype-specific development pattern was observed for MEN 2 components, with distinct age gradients in disease progression.
• Medullary thyroid cancer (MTC) development varied significantly across RET risk categories, while pheochromocytoma development differed between the two highest-risk categories.
• Primary hyperparathyroidism showed no significant differences in development across RET genotypes, and was notably absent in MEN 2B patients with highest-risk mutations.

Conclusions:

• The study delineates age-specific disease manifestation corridors for MEN 2 components, stratified by RET genotype.
• These genotype-specific corridors are valuable tools for initial risk assessment and targeted organ-specific surveillance in individuals identified with RET mutations.