Publication: Utility of BRAF V600E Immunohistochemistry Expression Pattern as a Surrogate of BRAF Mutation Status in 154 Patients with Advanced Melanoma
Issued Date
2015-08-01
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ISSN
15328392
00468177
00468177
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2-s2.0-84937526351
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Mahidol University
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SCOPUS
Bibliographic Citation
Human Pathology. Vol.46, No.8 (2015), 1101-1110
Suggested Citation
Michael T. Tetzlaff, Penvadee Pattanaprichakul, Jennifer Wargo, Patricia S. Fox, Keyur P. Patel, Jeannelyn S. Estrella, Russell R. Broaddus, Michelle D. Williams, Michael A. Davies, Mark J. Routbort, Alexander J. Lazar, Scott E. Woodman, Wen Jen Hwu, Jeffrey E. Gershenwald, Victor G. Prieto, Carlos A. Torres-Cabala, Jonathan L. Curry Utility of BRAF V600E Immunohistochemistry Expression Pattern as a Surrogate of BRAF Mutation Status in 154 Patients with Advanced Melanoma. Human Pathology. Vol.46, No.8 (2015), 1101-1110. doi:10.1016/j.humpath.2015.04.012 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/36359
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Title
Utility of BRAF V600E Immunohistochemistry Expression Pattern as a Surrogate of BRAF Mutation Status in 154 Patients with Advanced Melanoma
Author(s)
Michael T. Tetzlaff
Penvadee Pattanaprichakul
Jennifer Wargo
Patricia S. Fox
Keyur P. Patel
Jeannelyn S. Estrella
Russell R. Broaddus
Michelle D. Williams
Michael A. Davies
Mark J. Routbort
Alexander J. Lazar
Scott E. Woodman
Wen Jen Hwu
Jeffrey E. Gershenwald
Victor G. Prieto
Carlos A. Torres-Cabala
Jonathan L. Curry
Penvadee Pattanaprichakul
Jennifer Wargo
Patricia S. Fox
Keyur P. Patel
Jeannelyn S. Estrella
Russell R. Broaddus
Michelle D. Williams
Michael A. Davies
Mark J. Routbort
Alexander J. Lazar
Scott E. Woodman
Wen Jen Hwu
Jeffrey E. Gershenwald
Victor G. Prieto
Carlos A. Torres-Cabala
Jonathan L. Curry
Other Contributor(s)
Abstract
© 2015 Elsevier Inc. Summary Successful BRAF inhibitor therapy depends on the accurate assessment of the mutation status of the BRAF V600 residue in tissue samples. In melanoma, immunohistochemical (IHC) analysis with monoclonal anti-BRAF V600E has emerged as a sensitive and specific surrogate of BRAF V600E mutation, particularly when BRAF V600E protein expression is homogeneous and strong. A subset of melanomas exhibit heterogeneous labeling for BRAF V600E, but our understanding of the significance of heterogeneous BRAF V600E IHC expression is limited. We used next-generation sequencing to compare BRAF V600E IHC staining patterns in 154 melanomas: 79 BRAFWTand 75 BRAF (including 53 V600E) mutants. Agreement among dermatopathologists on tumor morphology, IHC expression, and intensity was excellent (ρ = 0.99). A predominantly epithelioid cell phenotype significantly correlated with the BRAF V600E mutation (P =.0085). Tumors demonstrating either heterogeneous or homogeneous IHC expression were significantly associated with the BRAF V600E mutation (P <.0001), as was increased intensity of staining (P <.0001). The positive predictive value was 98% for homogenous IHC expression compared with 70% for heterogeneous labeling. Inclusion of both heterogeneous and homogeneous BRAF V600E IHC expression as a positive test significantly improved IHC test sensitivity from 85% to 98%. However, this reduced BRAF V600E IHC test specificity from 99% to 96%. Cautious evaluation of heterogeneous BRAF V600E IHC expression is warranted and comparison with sequencing results is critical, given its reduced test specificity and positive predictive value for detecting the BRAF V600E mutation.