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Carbohydrate antigen expression in the adenoma-carcinoma sequence
1Gastrointestinal Research Laboratory, Veterans Administration Medical Center, San Francisco, CA 94121.
Progress in Clinical and Biological Research
|January 1, 1988
Summary
Altered expression of extended LeX and LeY antigens in colon cancer may indicate malignancy. These carbohydrate antigens are promising biomarkers for diagnosing colon neoplasia and understanding cancer development.
Area of Science:
- Oncology
- Glycobiology
- Biochemistry
Background:
- Carbohydrate antigen expression is altered in colon cancers.
- Extended LeX and LeY antigens are oncodevelopmental, found in fetal but not adult normal tissues.
- Aberrant expression of these antigens may be cancer-specific.
Purpose of the Study:
- To investigate the role of extended LeX and LeY antigens in colon cancer.
- To explore their potential as cancer-associated antigens and markers for premalignancy.
- To assess their utility in diagnosing colonic neoplasia.
Main Methods:
- Analysis of carbohydrate antigen expression in colon cancer tissues.
- Comparison of antigen expression in normal mucosa, adenomatous polyps, and hyperplastic polyps.
- Utilizing monoclonal antibodies against extended LeX and LeY antigens.
Main Results:
- Extended LeX and LeY antigens with internal fucosylation or terminal sialylation are expressed in colon cancers but not normal colonic mucosa.
- These antigens are also present in adenomatous polyps, correlating with malignant potential, but not hyperplastic polyps.
- Monoclonal antibodies against these antigens show promise in diagnosing colonic neoplasia.
Conclusions:
- Extended LeX and LeY antigens are potential cancer-specific markers for colon neoplasia.
- Their expression patterns suggest a role in the adenoma-carcinoma sequence.
- Further research is needed to understand the underlying molecular mechanisms and their biological significance.