RET splice site variants in medullary thyroid carcinoma

Area of Science:

• Oncology
• Genetics
• Molecular Biology

Background:

• Medullary thyroid carcinoma (MTC) is an aggressive malignancy often driven by mutations in the RET proto-oncogene.
• Splice site variants (SSVs) can alter mRNA processing and protein function, but their role in MTC is not well-established.

Purpose of the Study:

• To investigate the prevalence and diagnostic potential of RET splice site variants (SSVs) in medullary thyroid carcinoma (MTC).

Main Methods:

• Next-generation sequencing data from 3,624 cancer cases, including 25 MTCs, were analyzed for RET SSVs.
• Fisher exact tests were used to compare the frequency of RET SSVs between MTC and other cancer types.

Main Results:

• All 25 MTC cases (100%) exhibited at least one of the two most common RET SSVs.
• In contrast, only 0.3% of 3,599 non-MTC cancer cases harbored these common RET SSVs (p < 0.00001).
• Notably, 4 MTC cases lacked other identified RET driver mutations, highlighting the significance of SSVs.

Conclusions:

• The high prevalence of specific RET SSVs in MTC, coupled with their rarity in other cancers, suggests they are strong distinguishing markers for MTC.
• Further research is warranted to elucidate the pathogenic role of these RET SSVs in MTC development.