Inherited Thyroid Tumors With Oncocytic Change

Area of Science:

• Endocrinology and Genetics
• Oncology
• Molecular Biology

Background:

• Familial non-medullary thyroid carcinoma (FNMTC) accounts for 5-10% of follicular cell-derived thyroid carcinomas (FCDTC).
• Oncocytic thyroid tumors, both benign and malignant, show increased familial incidence compared to sporadic cases, presenting with cell oxyphilia.
• The genetic basis for the oncocytic phenotype in familial thyroid tumors remains largely unknown.

Purpose of the Study:

• To review current evidence on genomic mechanisms underlying the oncocytic change in FNMTC.
• To identify genetic markers associated with the familial aggregation of oncocytic thyroid tumors.
• To discuss challenges and future research directions for understanding oncocytic (F)NMTC.

Main Methods:

• Comprehensive literature review of genomic-based mechanisms in oncocytic thyroid tumors.
• Analysis of genetic alterations, including the GRIM-19 gene and 'Tumor with Cell Oxyphilia' (TCO) locus.
• Discussion of challenges such as private mutations, incomplete penetrance, and variable phenotypes.

Main Results:

• Limited progress in identifying causative genetic alterations, with many mutations being family-specific ('private mutations').
• GRIM-19 is a candidate gene within the TCO locus, but its role is not fully elucidated.
• Complex factors including incomplete penetrance and diverse clinical presentations complicate genetic studies.

Conclusions:

• Genomic mechanisms for oncocytic change in FNMTC are complex and not fully understood.
• Further research is needed to identify key genetic alterations and understand their impact on tumor behavior.
• Understanding these mechanisms may offer translational potential for targeted therapies in oncocytic thyroid cancer.