Abstract
Loss of function in the BRCA2 gene exacerbates ovarian, breast, and pancreatic ductal cancer risk. Despite being implicated in the pancreatic ductal epithelium carcinogenesis, the involvement of a germline BRCA2 mutation in acinar and endocrine cells is less reported. A 45-year-old woman with a history of breast cancer was referred to our hospital for a detailed examination of epigastric pain. Her father had pancreatic cancer, and her paternal aunt had a history of breast cancer. Contrast-enhanced computed tomography revealed a round tumor with a contrast effect in the pancreatic head. The patient underwent pancreaticoduodenectomy, and postoperative pathology and genetic testing revealed amphicrine-type mixed acinar–neuroendocrine carcinoma with a germline BRCA2 mutation. Recent studies have reported the BRCA2 mutation in genome sequencing of pancreatic acinar cell carcinoma and neuroendocrine tumor; perhaps, genetic testing for the BRCA2 mutation is feasible for patients with mixed neuroendocrine–non-neuroendocrine neoplasm.





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Acknowledgements
We thank Y. Omori for instructions on pathological findings. The authors would like to thank Enago (https://www.enago.jp) for English language review.
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This work was supported by JSPS KAKENHI (Grant Number: 21K15915) to Shin Miura.
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All authors contributed to the patient consultation. MI and SM wrote the first draft of the manuscript. All authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Ikeda, M., Miura, S., Kume, K. et al. Pancreatic mixed acinar–neuroendocrine carcinoma in a patient with a germline BRCA2 mutation: a case report. Clin J Gastroenterol 15, 999–1005 (2022). https://doi.org/10.1007/s12328-022-01668-8
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DOI: https://doi.org/10.1007/s12328-022-01668-8