Hepatic adenomas: analysis of sex steroid receptor status and the Wnt signaling pathway

Modern Pathology : an Official Journal of the United States and Canadian Academy of Pathology, Inc
Michael TorbensonTsung-Teh Wu

Abstract

Hepatic adenomas are strongly linked to excess hormonal exposure, but little else is known about their pathogenesis. The Wnt signaling pathway, which is activated in both hepatocellular carcinomas and hepatoblastomas, has not been studied in hepatic adenomas. Fifteen hepatic adenomas were studied by immunohistochemistry for estrogen, progesterone, and androgen receptors (ER, PR, AR, respectively) and correlated with the results of immunostaining for beta-catenin. Direct sequencing was performed to look for mutations in key genes involved in the Wnt signaling pathway: Exon 3 of beta-catenin encompassing the glycogen synthase kinase 3beta (GSK-3beta) phosphorylation region and the mutational cluster region of the adenomatosis polyposis coli protein (APC). Analysis for loss of heterozygosity (LOH) at chromosome 5q was also performed. Immunostaining for both ER and PR was present in 11/15 (73%) adenomas, and staining with one hormone receptor was positively associated with staining for the other receptor. AR positivity was present in 3/15 cases. Nuclear accumulation of beta-catenin was present in 7/15 (46%) of adenomas, indicating activation of the Wnt signaling pathway. However, no beta-catenin mutations, no APC mutations in the m...Continue Reading

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Feb 5, 2008·Modern Pathology : an Official Journal of the United States and Canadian Academy of Pathology, Inc·Shien T L MicchelliMichael Torbenson
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