The endocrine pancreatic tissue from 13 patients with severe chronic pancreatitis, 5 patients with pancreatic duct carcinoma and 4 non-diseased pancreases was analysed by immunocytochemistry and morphometry. The controls revealed two distinct islet types with different regional distribution. The lower dorsal part of the pancreatic head contained islets with irregular outlines and a high number of PP cells (PP-cells 60.4±4.1%; B-cells 29.4±4.6%; A-cells 7.4±1.5%; D-cells 2.8±0.6%). The other parts of the pancreas contained compact islets with only a few PP cells (PP-cells 1.0±0.4%; B-cells 69.3±3.0%; A-cells 24.1±2.1%; D-cells 5.8±0.5%). In chronic pancreatitis the sclerotic tissue of the body and the tail region contained compact islets with altered cell inter-relationships when compared with controls. While the number of B-cells was diminished (48.5%), A and PP cells appeared to be increased in number (42.7 and 4.1%, respectively). Furthermore, ductulo-insular proliferations were conspicuous (nesidioblastosis) with budding-off of small endocrine cell clusters made up predominantly of A and PP cells. In 3 patients with pancreatic carcinoma increased numbers of PP cells and of A cells were found along the advancing edge of the carcinoma.
The data emphasize the necessity of taking into consideration regional PP cell distribution in each case in which an increase of PP cells is observed. True hyperplasia is found in chronic pancreatitis and, focally, in some cases with pancreatic carcinoma.
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Bommer, G., Friedl, U., Heitz, P.U. et al. Pancreatic PP cell distribution and hyperplasia. Virchows Arch. A Path. Anat. and Histol. 387, 319–331 (1980). https://doi.org/10.1007/BF00454835
- Endocrine pancreas
- PP cells
- Normal pancreas
- Chronic pancreatitis
- Pancreatic carcinoma