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• W2013054658 abstract "Abrogation of the Wnt-signaling pathway is implicated in the carcinogenesis of several malignancies, especially colorectal cancer where up to 90% of cases are thought to have impaired Wnt signaling. It is less frequently involved in conventional ductal pancreatic adenocarcinoma. This pathway has not been explored in intraductal papillary mucinous neoplasms (IPMNs) of the pancreas previously and formed the basis of this study. A tissue microarray of 18 cases of IPMN was stained for proteins involved in the Wnt pathway: adenomatous polyposis coli (APC), pan-beta-catenin, axin 2, glycogen synthase 3alphabeta and 3beta, c-myc, E-cadherin, and cyclin D1. The IPMNs were classified as 8 adenomas, 3 borderline, and 7 cases with carcinoma in situ and/or invasive carcinoma, occurring in 13 females, and the overall age range was 45 to 73 years. Immunohistochemical analysis showed nuclear beta-catenin staining in 7 (39%) of the 18 cases. The cases with nuclear beta-catenin localization included 1 adenoma, 2 borderline IPMN, and 4 carcinomas in situ and/or invasive carcinomas. Seven cases showed absence of APC immunostaining and these included 4 cases with nuclear beta-catenin localization. Fourteen cases displayed marked diffuse up-regulation of c-myc protein, and 12 cases also showed diffuse cyclin D1 protein overexpression. E-cadherin expression was intense and membrane in location (comparable to normal tissue) in 6 of 8 adenomas (no tissue was available in 1 case). Decreased E-cadherin staining was noted in 8 cases where tissue was available for assessment. There was progressive decrease in membrane staining of E-cadherin in 2 of 3 borderline lesions, 1 of 2 carcinomas in situ, and 4 of 5 invasive carcinomas. All other immunostains were either normal in distribution or did not show any correlation with beta-catenin or clinicopathologic parameters. In conclusion, 7 (39%) of 18 cases of IPMN in this study demonstrated abnormal localization of beta-catenin, 4 of which also lacked APC expression. Of 5 carcinomas arising in IPMN, 4 displayed a decrease in E-cadherin expression. There was also a trend for the higher grades of IPMN to show nuclear localization of beta-catenin. These findings suggest that a proportion of cases of IPMN may show abnormalities in the Wnt-signaling pathway with consequent altered expression of downstream related proteins." @default.
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• W2013054658 date "2006-02-01" @default.
• W2013054658 modified "2023-09-23" @default.
• W2013054658 title "Expression of Wnt-signaling pathway proteins in intraductal papillary mucinous neoplasms of the pancreas: a tissue microarray analysis" @default.
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• W2013054658 doi "https://doi.org/10.1016/j.humpath.2005.11.002" @default.
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