{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,4]],"date-time":"2026-10-04T14:54:48Z","timestamp":1791125688131,"version":"4.1.0"},"reference-count":33,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2002,8,9]],"date-time":"2002-08-09T00:00:00Z","timestamp":1028851200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["pathsocjournals.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["The Journal of Pathology"],"published-print":{"date-parts":[[2002,11]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    PIK3CA, encoding the catalytic subunit p110\u03b1 of phosphatidylinositol 3\u2010kinase (PI3K), is activated in malignant diseases. However, the role of the PIK3CA gene aberrations for tumourigenesis of head and neck squamous cell carcinoma (HNSCC) is to date unclear. The present study was designed to determine the genomic aberration of PIK3CA in invasive HNSCC and dysplastic precursor lesions by fluorescence\n                    <jats:italic>in situ<\/jats:italic>\n                    hybridization (FISH) with a YAC probe, containing the PIK3CA gene, on isolated interphase nuclei from histomorphologically well\u2010defined regions of formalin\u2010fixed tissue sections and to compare these data with protein and mRNA expression of p110\u03b1. The mRNA and protein levels of p110\u03b1 were assessed, respectively, by\n                    <jats:italic>in situ<\/jats:italic>\n                    hybridization and immunohistochemistry on consecutive tissue sections. Copy number gains at 3q26 were observed in one of six low\u2010to\u2010moderate dysplasias (17%) and in seven of nine high\u2010grade dysplasias (78%), as well as in 11 carcinomas (100%). In addition, one of seven high\u2010grade dysplasias (14%) and 6 of 11 carcinomas (55%) had amplifications of 3q26. The majority of cases with copy number gain in more than 50% of the cells and\/or amplification in more than 10% of cells showed increased p110\u03b1 mRNA and protein expression, whereas only two cases (18%) (one high\u2010grade dysplasia and one carcinoma) with no gain or low\u2010level gain displayed increased p110\u03b1 protein expression. These data suggest that 3q26 copy number gain and amplification represent early genomic aberrations in HNSCC carcinogenesis. In addition, p110\u03b1 mRNA and protein expression in HNSCC may be regulated by these genomic aberrations as well as by epigenetic events. Copyright \u00a9 2002 John Wiley &amp; Sons, Ltd.\n                  <\/jats:p>","DOI":"10.1002\/path.1207","type":"journal-article","created":{"date-parts":[[2002,10,10]],"date-time":"2002-10-10T12:20:52Z","timestamp":1034252452000},"page":"335-342","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":119,"title":["Genomic gain of PIK3CA and increased expression of p110alpha are associated with progression of dysplasia into invasive squamous cell 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