BRAF mutations in thyroid tumors from an ethnically diverse group

Area of Science:

• Oncology
• Genetics
• Molecular Biology

Background:

• The molecular basis of thyroid carcinoma (TC) and precursor lesions requires further elucidation.
• Understanding BRAF mutations is crucial for diagnosing and treating thyroid diseases.

Purpose of the Study:

• To determine the frequency, type, and clinicopathological significance of BRAF exon 15 mutations in various thyroid lesions.
• To analyze these mutations in an ethnically diverse population.

Main Methods:

• Sequencing of BRAF exon 15 in 381 thyroid lesions, including non-cancerous and cancerous types.
• Analysis of mutation prevalence and correlation with clinicopathological features.

Main Results:

• BRAF mutations, predominantly V600E, were found in 63% of papillary TC (PTC), 18% of micro PTC, and 17% of follicular variant PTC (FVPTC).
• Novel mutations (p.T599del, p.T599dup) and K601E mutations were identified.
• In PTC, BRAF mutations correlated with older age, larger tumor size, vessel invasion, and distant metastasis.

Conclusions:

• Older age in PTC patients is linked to unfavorable tumor markers.
• The K601E mutation appears more widespread across TC types than previously recognized.
• New BRAF mutations (T599del, T599dup) were identified, expanding the known mutation landscape in thyroid cancer.