Abstract
Bile duct biopsy is being increasingly performed in number for a definite diagnosis of cholangiocarcinoma. However, difficulties are associated with a histopathological diagnosis because of the limited small amount of specimen obtained and crash artifact. The aim of the present study was to identify useful diagnostic immunohistochemical markers in bile duct biopsy that support a histological diagnosis. Fifty-one bile duct biopsy samples, including 26 samples taken from patients with cholangiocarcinoma, 11 with intraductal papillary neoplasm of the bile duct (IPNB), and 14 with benign bile duct lesions, were examined. Histology and the immunohistochemical expression of insulin-like growth factor II mRNA-binding protein 3 (IMP3), enhancer of zeste homolog 2 (EZH2), and p53 were assessed. They were then evaluated for their usefulness as diagnostic markers of malignancy. The diagnostic sensitivity and accuracy of the institutional histological diagnosis were 53.8% and 70.0%, respectively. The diagnostic sensitivity and accuracy of IMP3, EZH2, and p53 were 69.2% and 80.0%, 76.9% and 85.0%, and 50.0% and 67.5%, respectively. Immunohistochemical staining for EZH2; the combination of either 2 of IMP3, EZH2, and p53; or the combination of IMP3, EZH2, and p53 significantly increased sensitivity and accuracy over those of the institutional histological diagnosis (p<0.05). In conclusion, an immunohistochemical panel consisting of IMP3, EZH2, and p53 increases the diagnostic sensitivity and accuracy of bile duct biopsy for the diagnosis of cholangiocarcinoma.
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The present study was supported in part by a Grant-in Aid for Scientific Research (C) from the Ministry of Education, Culture, Sports and Science and Technology of Japan (18K06985).
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Study conception and design were performed by Motoko Sasaki. Material preparation and data collection and analysis were performed by Motoko Sasaki and Yasunori Sato. The first draft of the manuscript was written by Motoko Sasaki and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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The Ethics Committee of Kanazawa University approved the present study. The work described herein was conducted in accordance with The Code of Ethics of the World Medical Association (Declaration of Helsinki) for experiments involving humans.
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Sasaki, M., Sato, Y. An immunohistochemical panel of insulin-like growth factor II mRNA-binding protein 3 (IMP3), enhancer of zeste homolog 2 (EZH2), and p53 is useful for a diagnosis in bile duct biopsy. Virchows Arch 479, 697–703 (2021). https://doi.org/10.1007/s00428-021-03132-3
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DOI: https://doi.org/10.1007/s00428-021-03132-3