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Biomarker studies in reversed Barrett's esophagus
H Garewal1, L Ramsey, P Sharma
1Section of Hematology-Oncology, VA Medical Center and University of Arizona Health Sciences Center, Tucson 85723, USA.
The American Journal of Gastroenterology
|October 16, 1999
Summary
Biomarkers indicate that complete reversal of intestinal metaplasia to squamous epithelium in Barrett's esophagus patients suggests low cancer risk. However, partial reversal, seen as squamous islands, shows abnormal biomarkers.
Area of Science:
- Gastroenterology
- Oncology
- Molecular Biology
Background:
- Barrett's esophagus (BE) is a precursor to esophageal adenocarcinoma.
- Understanding the risk of malignant transformation in BE patients with varying degrees of squamous differentiation is crucial.
Purpose of the Study:
- To assess cancer risk in BE patients by evaluating biomarkers in cases of complete reversal to squamous epithelium versus those with squamous islands.
- To differentiate the biological characteristics of completely reversed versus partially reversed (squamous islands) intestinal metaplasia.
Main Methods:
- Biomarker analysis including Ki-67 for proliferation, p53 abnormalities via immunohistochemistry (DO-1, DO-7 antibodies), and ornithine decarboxylase (ODC) activity.
- Comparison of biomarker profiles between 11 patients with complete reversal and 14 patients with squamous islands.
Main Results:
- Complete reversal cases (n=11) showed normal Ki-67 staining, negative p53, and low ODC activity, similar to normal squamous epithelium.
- Partial reversal (squamous islands, n=14) exhibited abnormal Ki-67 staining (64%) and positive p53 staining (43%).
Conclusions:
- Completely reversed squamous epithelium in BE appears biologically similar to normal squamous epithelium, indicating a low cancer risk.
- Partial reversal, characterized by squamous islands, is associated with biomarker abnormalities, suggesting a potentially higher cancer risk.