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• W2152367439 abstract "Up-regulation of p16INK4A is associated with high-risk human papillomavirus (HPV) in preinvasive and invasive cervical neoplasia. However, its expression in vulvar carcinomas, which have a diverse pathogenesis, has not been extensively studied. One hundred seventy-seven vulvar intraepithelial neoplasms (VIN), squamous cell carcinomas (SCC), and benign squamous epithelia were analyzed for p16 expression. RNA/RNA in situ hybridization was used to detect HPV 16 E6/E7 transcripts in 112. Ninety-five percent of VIN 3 and basaloid or warty SCCs (76/80) and 4% of keratinizing SCC (2/48) were moderately to strongly immunopositive for p16, which localized to nucleus and cytoplasm; 52/58 analyzed (90%) contained HPV 16 transcripts. The positive predictive value (PPV) of moderate to strong diffuse p16 immunostaining and HPV positivity for the diagnosis of VIN 3 and of basaloid or warty SCC was 97% and 95%, respectively. Conversely, 94% of keratinizing SCC contained heterogeneous staining, and when present, it was strictly cytoplasmic and frequently localized to the cells at the epithelial-stromal interface. Benign squamous epithelia were p16 negative, with the exception of lichen sclerosus, which contained focal and heterogeneously p16 positive in 42%. As in the cervix, intense diffuse p16 expression supports an HPV-related neoplastic process in vulvar neoplasia, irrespective of the level of differentiation. Up-regulation of p16 at the epithelial-stromal interface in HPV negative keratinizing SCCs is consistent with an HPV-independent response to alterations associated with invasion. These disparate patterns of p16 expression underscore 2 different mechanisms for p16 expression in HPV-related and HPV-unrelated vulvar carcinomas." @default.
• W2152367439 created "2016-06-24" @default.
• W2152367439 creator A5045636893 @default.
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• W2152367439 date "2004-12-01" @default.
• W2152367439 modified "2023-10-18" @default.
• W2152367439 title "p16INK4A expression as biomarker for HPV 16-related vulvar neoplasias" @default.
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• W2152367439 doi "https://doi.org/10.1016/j.humpath.2004.09.004" @default.
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