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  • Title: BRAF-V600E expression in primary nodular melanoma is associated with aggressive tumour features and reduced survival.
    Author: Hugdahl E, Kalvenes MB, Puntervoll HE, Ladstein RG, Akslen LA.
    Journal: Br J Cancer; 2016 Mar 29; 114(7):801-8. PubMed ID: 26924424.
    Abstract:
    BACKGROUND: Around 50% of primary melanomas harbour BRAF mutations, but their prognostic impact has not been clear. Recently, a BRAF-V600E mutation-specific antibody has become available for immunohistochemistry. Here, we investigated for the first time the prognostic impact of BRAF-V600E protein expression in primary melanoma. METHODS: In a patient series of 248 nodular melanomas, BRAF-V600E and total BRAF expression were assessed by immunohistochemistry using tissue microarray sections of paraffin-embedded archival tissue. Mutation status was assessed by real-time PCR in cases with sufficient tumour tissue (n=191). RESULTS: Positive BRAF-V600E expression was present in 86 (35%) of the cases, and was significantly associated with increased tumour thickness, presence of tumour ulceration and reduced survival. Further, BRAF-V600E expression was an independent prognostic factor by multivariate analysis, whereas BRAF mutation status was not significant. There was 88% concordance between BRAF-V600E expression and mutation status. CONCLUSIONS: Our findings indicate that BRAF-V600E expression is a novel prognostic marker in primary melanoma.
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