Abstract
Aberrant Wnt signaling is a hallmark of solid pseudopapillary neoplasms (SPNs) of the pancreas. Transcription factor E3 (TFE3) plays a critical role in activation and regulation of the Wnt pathway and is predicted to be a candidate gene implicated in SPN by gene regulatory network analysis. The aim of this study was to evaluate TFE3 as a marker for SPN. Paraffin-embedded tissues of SPN (n = 75) and other primary pancreatic tumors were analyzed, including pancreatic neuroendocrine tumors (n = 17), pancreatic ductal adenocarcinomas (n = 14), pancreatic neuroendocrine carcinomas (n = 4), and acinar cell carcinomas (n = 3). The clinicopathological features were summarized as well. Differentiation of specific pancreatic duct or acinus was not found in any SPN tissue. Morphologic and immunohistochemical results indicated that SPN displays certain characteristics of neuroendocrine cells. Overall, 71 (94.67%) cases of SPN showed nuclear accumulation for TFE3, most of which displayed moderate to intense expression. The TFE3 positive rates in pancreatic neuroendocrine tumor, pancreatic ductal adenocarcinoma, and pancreatic neuroendocrine carcinoma were 23.53%, 14.29%, and 25%, respectively. All 3 cases of acinar cell carcinoma were negat...Continue Reading
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