Head and neck tumor sites differ in prevalence and spectrum of p53 alterations but these have limited prognostic value

International Journal of Cancer. Journal International Du Cancer
Franz X BoschHagen Weidauer

Abstract

The tumor site is a strong clinical factor in head and neck squamous cell carcinoma (HNSCC). To clarify the biologic and clinical role of p53 alterations in HNSCC, we have examined the prevalence and the nature of p53 alterations in a large cohort of tumors from the different sites. For immunohistochemical analysis of p53 protein expression, we introduced tyramide signal amplification immunohistochemistry (TSA-IHC) on a tissue microarray. This allowed the discrimination between normal low-level expression and reduced or lost expression. Two hundred fifty-three tumors were subjected to mutational analysis by genomic DNA sequencing, employing also the p53 GeneChip from Affymetrix. The prevalence of all p53 alterations, i.e., mutations, overexpression and loss of expression, was significantly higher in hypopharyngeal tumors than in the other sites (p = 0.001). Laryngeal tumors showed the lowest rate of p53 alterations, but revealed a distinct mutation spectrum: most mutations affected exon 5 (p = 0.013) and the S2' domain (p = 0.002), and most hot-spot 248 mutations occurred in the larynx (p < 0.001). Sequencing by p53GeneChip technology was shown to be only insignificantly more sensitive than dideoxy sequencing. In agreement with...Continue Reading

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