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Molecular Biology and Genetics

KAI1 Is Unchanged in Metastatic and Nonmetastatic Esophageal and Gastric Cancers

Xiao-Zhong Guo, Helmut Friess, Christoph Maurer, Pascal Berberat, Wen-Hao Tang, Arthur Zimmermann, Markus Naef, Hans U. Graber, Murray Korc and Markus W. Büchler
Xiao-Zhong Guo
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Helmut Friess
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Christoph Maurer
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Pascal Berberat
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Wen-Hao Tang
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Arthur Zimmermann
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Markus Naef
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Hans U. Graber
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Murray Korc
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Markus W. Büchler
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DOI:  Published February 1998
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Abstract

Down-regulation of KAI1 mRNA expression has been shown to be associated with the formation of metastases or disease progression in pancreatic cancer. Whether KAI1 possesses similar characteristics in other malignancies of the gastrointestinal tract is not known.

Here, we compared the patterns of KAI1 mRNA expression in 41 esophageal cancers and 35 stomach cancers to assess whether KAI1 might also be of biological relevance in the metastatic ability of these tumors.

By Northern blot analysis, KAI1 mRNA levels ranged widely in both normal and cancerous esophageal and gastric tissue samples, with no statistical differences. No association between KAI1 mRNA expression and tumor stage or tumor differentiation was seen in these tumors. In addition, KAI1 mRNA expression was similar in primary esophageal and gastric cancer samples with or without metastases. By in situ hybridization, KAI1 mRNA expression was evident in the cytoplasm of most squamous epithelial cells in the normal esophagus and in nonmucosal epithelial cells of the normal stomach. The staining intensity in the esophageal and gastric cancer cells was similar to that in the normal controls.

This differential pattern of KAI1 mRNA expression in esophageal and gastric cancers in comparison to pancreatic cancer indicates that KAI1 seems to influence the potential of gastrointestinal cancer cells to metastasize differently. In esophageal and gastric cancers, the formation of metastases is not dependent on the reduction of KAI1 in the cancer cells.

Footnotes

  • ↵1 This work was supported by Swiss National Foundation for Scientific Research, Grant 32-049494.96/1.

  • ↵2 To whom requests for reprints should be addressed. Phone: 41 31 632 9722; Fax: 41 31 632 9732.

  • Received August 1, 1997.
  • Accepted December 15, 1997.
  • ©1998 American Association for Cancer Research.
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February 1998
Volume 58, Issue 4
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KAI1 Is Unchanged in Metastatic and Nonmetastatic Esophageal and Gastric Cancers
Xiao-Zhong Guo, Helmut Friess, Christoph Maurer, Pascal Berberat, Wen-Hao Tang, Arthur Zimmermann, Markus Naef, Hans U. Graber, Murray Korc and Markus W. Büchler
Cancer Res February 15 1998 (58) (4) 753-758;

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KAI1 Is Unchanged in Metastatic and Nonmetastatic Esophageal and Gastric Cancers
Xiao-Zhong Guo, Helmut Friess, Christoph Maurer, Pascal Berberat, Wen-Hao Tang, Arthur Zimmermann, Markus Naef, Hans U. Graber, Murray Korc and Markus W. Büchler
Cancer Res February 15 1998 (58) (4) 753-758;
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