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Electronic Journal of Biotechnology
Universidad Católica de Valparaíso
ISSN: 0717-3458
Vol. 3, No. 3, 2000, pp. 167-183
Bioline Code: ej00018
Full paper language: English
Document type: Review Article
Document available free of charge

Electronic Journal of Biotechnology, Vol. 3, No. 3, 2000, pp. 167-183

 en Field defects in progression to adenocarcinoma of the colon and esophagus
Bernstein, Carol; Bernstein, Harris; Payne, Claire M. & Garewal, Harinder

Abstract

A field of defective tissue (field defect) appears to be an early stage in the progression to adenocarcinoma of both the colon and the esophagus. In both cases the field is comprised of cells characterized by resistance to induction of apoptosis, aberrant increased proliferation and genomic instability. Specific mutations and epimutations occur in both types of field. Also there is evidence for aberrant overexpression or underexpression of specific proteins. Most of these early molecular alterations appear to promote either enhanced apoptosis resistance, proliferation, or genomic instability. The molecular alterations that are present early are often, but not always, also present to an even greater degree in the cancer itself. Many of the important events in the development of colonic and esophageal adenocarcinoma first occur in tissues that are histologically neither dysplastic nor malignant. The identification of early molecular defects in morphologically normal appearing tissue is paramount in identifying subjects at high risk for cancer.

Keywords
apoptosis resistance, barrett's esophagus, chromosome instability, colon cancer, field effects, ulcerative colitis

 
© 2000 by Universidad Católica de Valparaíso -- Chile
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