Abstract
Detection of BRAFV600E is useful for making diagnosis and risk stratification of papillary thyroid carcinoma (PTC). Molecular testing, however, is not always available for routine clinical use. To assess the clinical utility and reliability of VE1 immunohistochemistry (IHC) for detecting BRAFV600E mutation in PTC, VE1 IHC was performed on the tissue microarrays of 514 patients with PTC and was compared with Sanger sequencing results. Of 514 PTC cases, 433 (84.2%) were positive for VE1 expression. Among 6 discordant cases between VE1 IHC and Sanger sequencing, 3 initial VE1-false negative cases turned out to be true false negative on repeat testing, and 3 VE1-false positive cases showed BRAFV600E mutation using digital PCR analysis. PTCs with low variant allele fraction were positive for VE1 IHC but were not detected using sequencing. VE1 IHC showed 99.3% sensitivity, 100% specificity, 100% positive predictive value, and 96.4% negative predictive value. The BRAFV600E mutation was significantly associated with older age, multifocality, extrathyroidal extension, lymph node metastasis, and advanced tumor stage. In conclusion, VE1 IHC is a reliable method for detecting BRAFV600E mutation in PTC specimens.
Original language | English |
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Article number | 596 |
Journal | Cancers |
Volume | 12 |
Issue number | 3 |
DOIs | |
State | Published - Mar 2020 |
Bibliographical note
Funding Information:Funding: This research was funded by a grant (2017R1D1A1B03029597) from the Basic Science Research Program through the National Research Foundation of Korea (Daejeon, Republic of Korea) funded by the Ministry of Science and ICT and by Ractchadapiseksompotch Fund (grant number RA62/076, 2019-2020, Chulalongkorn University).
Publisher Copyright:
© 2020 by the authors. Licensee MDPI, Basel, Switzerland.
Keywords
- BRAF
- Diagnostic performance
- Immunohistochemistry
- Papillary thyroid carcinoma
- VE1