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The expressions of epidermal growth factors (EGF), epidermal growth factor receptors (EGFR), and the c-erbB-2 oncoprotein were immunohistochemically examined in 25 cases of human pancreatic carcinoma and epineoplastic pancreatitis and in 10 non-cancerous/non-inflammatory pancreatic tissues. The positive rates of EGF, EGFR, and the c-erbB-2 oncoprotein in cancer tissues were 72%, 36%, and 28%, respectively. EGF was stained mainly in the cytoplasm and partly on the surfaces of the cancer cells. EGFR and the c-erbB-2 oncoprotein were stained mainly on the surfaces of the cancer cells and partly in the cytoplasm. The expressions of these 3 products correlated significantly with tumor invasion into the anterior and posterior areas surrounding the pancreas. In the EGF, EGFR, and c-erbB-2 positive cancer tissues, some stromal cells, that is fibroblasts and endothelial cells, were also positive. In the adjacent pancreatic tissues with inflammation, these products were noted in some ductal cells, acinar cells, fibroblasts and endothelial cells. No distinct staining was detected in non-cancerous/non-inflammatory tissues. The survival period for patients who tested positive for these three proteins was statistically shorter than for those who tested negative. These results suggest that the coexpression of EGF and EGFR and the expression of the c-erbB-2 oncoprotein are related to the existence of the invasion of human pancreatic cancer. Furthermore, an immunohistochemical examination of these three products is useful in forming a prognosis for pancreatic cancer patients.

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The immunohistochemical expressions of epidermal growth factors, epidermal growth factor receptors and c-erbB-2 oncoprotein in human pancreatic cancer.