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- W3091944805 abstract "Abstract Inverted (Schneiderian) sinonasal papilloma (ISP) is a neoplasm derived from mucosa of the sinonasal tract characterized by local aggressive growth, a tendency to recur and an association with sinonasal carcinoma. The etiology of ISP remains unclear. Recently, identical mutations in exons 19 and 20 of the oncogene EGFR were reported in ISP and ISP-associated sinonasal carcinoma. Nevertheless, it remains unclear whether recurring ISPs show identical EGFR mutations at different time points or whether these mutations are identical throughout the respective ISP sample. We used Sanger sequencing to test 60 formalin-fixed paraffin embedded ISP samples from 40 patients regarding mutations in exons 19 and 20 of EGFR —together with exon 15 of BRAF . Overall, 32 samples of 22 patients showed a mutation in EGFR exon 20, whereas 28 samples of 18 patients showed none. No mutation in EGFR exon 19 was found in any sample. Four samples of four patients showed a BRAF exon 15 mutation. Interestingly, samples of four patients exhibited genetic heterogeneity, enabling us to report this in ISP for the first time." @default.
- W3091944805 created "2020-10-15" @default.
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- W3091944805 date "2020-10-13" @default.
- W3091944805 modified "2023-10-16" @default.
- W3091944805 title "EGFR and BRAF mutations in inverted sinonasal papilloma — a more complex landscape?" @default.
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- W3091944805 doi "https://doi.org/10.1007/s00428-020-02945-y" @default.
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