Helicobacter Pylori
Copyright ©2005 Baishideng Publishing Group Inc. All rights reserved.
World J Gastroenterol. Apr 7, 2005; 11(13): 1937-1945
Published online Apr 7, 2005. doi: 10.3748/wjg.v11.i13.1937
Gene expression profiling reveals sequential changes in gastric tubular adenoma and carcinoma in situ
Chang-Hee Lee, Seung-Hyun Bang, Seung-Koo Lee, Kyu-Young Song, In-Chul Lee
Chang-Hee Lee, Seung-Hyun Bang, Seung-Koo Lee, Asan Institute for Life Sciences, University of Ulsan College of Medicine, Seoul 138-736, Korea
Kyu-Young Song, Department of Biochemistry, University of Ulsan College of Medicine, Seoul 138-736, Korea
In-Chul Lee, Department of Pathology, University of Ulsan College of Medicine, Seoul 138-736, Korea
Author contributions: All authors contributed equally to the work.
Correspondence to: Professor In-Chul Lee, Department of Pathology, University of Ulsan College of Medicine, 388-1 Poongnap-Dong, Songpa-Gu, Seoul 138-736, Korea. iclee@amc.seoul.kr
Telephone: +82-2-30104551 Fax: +82-2-4727898
Received: June 24, 2004
Revised: June 25, 2004
Accepted: July 17, 2004
Published online: April 7, 2005
Abstract

AIM: To analyze the expression profiles of premalignant and/or preclinical lesions of gastric cancers.

METHODS: We analyzed the expression profiles of normal gastric pit, tubular adenoma and carcinoma in situ using microdissected cells from routine gastric biopsies. For the DNA microarray analysis of formalin-fixed samples, we developed a simple and reproducible RNA extraction and linear amplification procedure applying two polymerase-binding sites. The amplification procedure took only 8 h and yielded comparable DNA microarray data between formalin-fixed tissues and unfixed controls.

RESULTS: In comparison with normal pit, adenoma/carcinoma showed 504 up-regulated and 29 down-regulated genes at the expected false significance rate 0.15%. The differential expression between adenoma and carcinoma in situ was subtle: 50 and 22 genes were up-, and down-regulated in carcinomas at the expected false significance rate of 0.61%, respectively. Differentially expressed genes were grouped according to patterns of the sequential changes for the the ‘tendency analysis’ in the gastric mucosa-adenoma-carcinoma sequence.

CONCLUSION: Groups of genes are shown to reflect the sequential expression changes in the early carcinogenic steps of stomach cancer. It is suggested that molecular carcinogenic pathways could be analyzed using routinely processed biopsies.

Keywords: Premalignant lesion; Preclinical lesion; Gastric cancer