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Basic Sciences

Aberrant Expression of Epidermal Growth Factor Receptor and HER-2 (erbB-2) Messenger RNAs in Human Renal Cancers

Michael R. Freeman, Robert Washecka and Leland W. K. Chung
Michael R. Freeman
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Robert Washecka
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Leland W. K. Chung
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DOI:  Published November 1989
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Abstract

Amplification, rearrangement, or overexpression of the gene for the epidermal growth factor receptor (EGFR) occurs in certain types of human neoplasia. We investigated EGFR gene structure and measured EGFR mRNA levels in human renal tumor biopsies. Seventeen renal tumors [13 renal cell carcinomas (RCCs), two Wilms' tumors, one oncocytoma, and one metastatic ganglioneuroblastoma] and their corresponding normal kidney tissues were examined for EGFR gene structural integrity by Southern blot hybridization. Twelve of these tumors (including 11 RCCs) were examined for EGFR mRNA expression levels by RNA blot hybridization. The EGFR gene was rearranged in one of 13 (8%) of the RCC specimens examined and was highly amplified in the ganglioneuroblastoma. The overall frequency of EGFR gene structure alterations in this series of renal tumors was 12%. Nine of 11 RCC specimens (82%) exhibited markedly elevated EGFR mRNA levels (approximately 2- to 6-fold). In contrast, expression of the EGFR-related protooncogene HER-2 (erbB-2) was found to be decreased in 11 RCCs and one Wilms' tumor; HER-2 gene structure, however, appeared normal in all specimens. These results indicate that overexpression of EGFR mRNA, probably due to changes in gene regulation, and underexpression of HER-2 mRNA are characteristic features of human RCC.

Footnotes

  • ↵1 This work was supported in part by NIH Grant DK-38649 and by the New Development Fund and was submitted in abstract form to the American Urological Association Annual Meeting on Oct. 1, 1988.

  • ↵2 To whom requests for reprints should be addressed.

  • Received March 27, 1989.
  • Revision received June 30, 1989.
  • Accepted August 16, 1989.
  • ©1989 American Association for Cancer Research.
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November 1989
Volume 49, Issue 22
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Aberrant Expression of Epidermal Growth Factor Receptor and HER-2 (erbB-2) Messenger RNAs in Human Renal Cancers
Michael R. Freeman, Robert Washecka and Leland W. K. Chung
Cancer Res November 15 1989 (49) (22) 6221-6225;

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Aberrant Expression of Epidermal Growth Factor Receptor and HER-2 (erbB-2) Messenger RNAs in Human Renal Cancers
Michael R. Freeman, Robert Washecka and Leland W. K. Chung
Cancer Res November 15 1989 (49) (22) 6221-6225;
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