Oncogene expression in endocrine pancreatie tumors |
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Authors: | Heinz Höfler Christine Ruhri Barbara Pütz Gerhard Wirnsberger Hubert Häuser |
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Institution: | 1. Division of Oncology and Experimental Cell Research, Institute of Pathology, University of Graz School of Medicine, Auenbruggerplatz 25, A-8036, Graz, Austria
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Abstract: | The mRNA expression of the (proto) oncogenes Ha-ras, Ki-ras, fos, c-myc, N-myc, and sis was studied in five pancreatic endocrine
tumors and two non-neoplastic pancreases by in situ hybridization and Northern blot analysis. Ha-ras, Ki-ras, fos and c-myc,
but not N-myc or sis mRNA was detected in all the tumors as well as in the non-neoplastic pancreatic tissues. Compared with
non-tumorous pancreatic tissue, Ha-ras and Ki-ras mRNA was overexpressed up to 42-fold in all the tumors; metastasizing tumors
showed 2–6 times higher Ha-ras mRNA levels than benign neoplasias. In contrast, c-myc mRNA levels were higher in normal tissue
than in tumors and fos mRNA levels did not differ significantly between tumors and normal tissue. The activities of Ki-ras,
fos and c-myc mRNA expression did not correlate with any of the histological or biological properties of the tumors, nor with
the clinical course of disease. Our results, although based on a limited number of cases, suggest that Ha-ras and Ki-ras mRNA
overexpression is associated with the development of pancreatic endocrine tumors. The measurement of Ha-ras mRNA levels may
contribute to the assessment of tumor prognosis.
Supported by grants of the “ Fonds zur F?rderung der Forschung” (P 5314) and by the “Jubil?umsfonds” of the Austrian National
Bank (P 2889) to H.H. |
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Keywords: | Endocrine pancreatic tumors Oncogenes mRNA Hybridization |
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