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Journal Article
Pancreatic acinar cell carcinoma with endocrine differentiation: immunohistochemical and ultrastructural analyses.
Anticancer Research 2001 May
The majority of pancreatic malignant tumors are adenocarcinomas of the ductal type (ductal cell carcinomas) and combined tumors consisting of different tumor components are very rare. We present here a rare case of acinar cell carcinoma with apparent foci of endocrine differentiation. A 46-year-old man underwent pylorus-preserving pancreatoduodenectomy under the diagnosis of pancreatic tumor. The pancreatic tumor was mainly composed of typical acinar cell carcinoma, but some tumor cells were positive for both acinar and endocrine cell markers such as pancreatic amylase, trypsin, lipase and chromogranin A. At the electron-microscopic level, the tumor cells were seen to have numerous electron-dense neuroendocrine, as well as a few zymogen-like, granules. The tumor part positive for both acinar and endocrine cell markers originated from a subclone (dis-differentiated tumor cells) of the typical acinar cell carcinoma tissue of the pancreas.
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