Genetics of parathyroid tumours

Area of Science:

• Endocrinology
• Genetics
• Oncology

Background:

• Primary hyperparathyroidism (PHPT) presents as syndromic or isolated disorders, with familial or sporadic origins.
• Syndromic forms include Multiple Endocrine Neoplasia (MEN) types 1-4 and hyperparathyroidism-jaw tumour (HPT-JT) syndrome.
• Sporadic PHPT commonly involves single parathyroid adenomas, while syndromic/hereditary forms may feature multiple tumors; parathyroid carcinoma occurs in HPT-JT.

Purpose of the Study:

• To delineate the genetic basis and clinical presentations of various forms of PHPT.
• To highlight the genetic mutations associated with syndromic and nonsyndromic PHPT.
• To emphasize the diagnostic and management utility of genetic testing in PHPT.

Main Methods:

• Review of genetic causes of PHPT, including MEN1, MEN2, MEN4, HPT-JT, and familial isolated hyperparathyroidism.
• Analysis of gene mutations (MEN1, RET, CDNK1B, CDC73, CASR) linked to PHPT.
• Discussion of the clinical implications of genetic findings in PHPT diagnosis and management.

Main Results:

• PHPT is associated with mutations in MEN1, RET, CDNK1B, CDC73, and CASR genes.
• Specific genes are linked to distinct syndromic forms (e.g., MEN1, RET, CDNK1B, CDC73).
• Over 10% of PHPT patients harbor mutations in 11 identified genes, with genetic testing proving valuable.

Conclusions:

• PHPT arises from diverse genetic abnormalities, influencing its clinical presentation and inheritance patterns.
• Understanding the genetic underpinnings of PHPT is crucial for accurate diagnosis and tailored patient management.
• Genetic testing offers significant clinical value in diagnosing and managing complex PHPT cases involving parathyroid tumors.