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Employing Digital Droplet PCR to Detect BRAF V600E Mutations in Formalin-fixed Paraffin-embedded Reference Standard Cell Lines
Published on: October 8, 2015
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BRAF V600E mutation is associated with aggressive features in papillary thyroid carcinomas ≤ 1.5 cm
Jennifer A Silver1,2, Mariya Bogatchenko1, Marc Pusztaszeri1,3,4
1Faculty of Medicine, McGill University, Montreal, QC, Canada.
Summary
The BRAF V600E mutation is linked to aggressive features in both papillary thyroid microcarcinoma (PTMC) and small papillary thyroid carcinoma (PTC). Identifying this mutation can aid in managing these small thyroid nodules.
Area of Science:
- Endocrinology
- Oncology
- Molecular Pathology
Background:
- Papillary thyroid microcarcinoma (PTMC) and small papillary thyroid carcinoma (PTC) are common thyroid cancers.
- The BRAF V600E mutation is frequently observed in thyroid cancers, but its association with aggressive features in smaller tumors requires further investigation.
- Current management strategies for small thyroid nodules often rely on size alone, highlighting a need for better risk stratification tools.
Purpose of the Study:
- To investigate the association between the BRAF V600E mutation and aggressive clinicopathological features in PTMC (≤1 cm) and small PTC (1-1.5 cm).
- To determine if BRAF V600E mutation status can serve as a predictive marker for high-risk features in these small thyroid tumors.
Main Methods:
- Retrospective analysis of 121 patients who underwent thyroid surgery and BRAF V600E mutation testing.
- Patients were categorized into two groups: PTMC (n=55) and small PTC (n=66).
- Tumors were evaluated for BRAF V600E mutation and aggressive features including extrathyroidal extension, lymph node metastasis, and high-risk histology. Statistical significance was assessed using the Fischer exact test.
Main Results:
- BRAF V600E mutations were present in 43.6% of PTMC and 42.4% of small PTC cases.
- Mutated PTMC nodules showed a significantly higher rate of aggressive features (54.1%) compared to non-mutated ones (19.4%, p=0.010).
- Mutated small PTC tumors also exhibited a significantly higher prevalence of aggressive features (82.1%) than non-mutated tumors (28.9%, p<0.001).
Conclusions:
- The BRAF V600E mutation is significantly associated with aggressive features in both PTMC and small PTC.
- Molecular testing for BRAF V600E in small thyroid nodules can provide valuable information for clinical decision-making and risk stratification.
- These findings support the integration of molecular profiling into the management of small thyroid nodules to better predict tumor behavior.
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