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Pathophysiology of Barrett's esophagus
1Department of Surgical Pathology, University of Southern California, Los Angeles 90033, USA.
Seminars in Thoracic and Cardiovascular Surgery
|July 1, 1997
Summary
Gastroesophageal reflux disease (GERD) causes metaplasia, leading to Barrett's esophagus and potentially cancer. A new assessment method correlates GERD severity with biopsy findings, proposing revised terminology.
Area of Science:
- Gastroenterology
- Pathophysiology
- Oncology
Background:
- Gastroesophageal reflux disease (GERD) is linked to esophageal metaplasia.
- Existing understanding of cardiac mucosa and Barrett's esophagus requires revision.
- Autopsy studies reveal variations in esophageal anatomy relevant to GERD.
Purpose of the Study:
- To present a novel pathophysiology of Barrett's esophagus.
- To introduce a new method for assessing biopsy specimens in GERD patients.
- To propose a revised terminology for GERD-related esophageal changes.
Main Methods:
- Analysis of autopsy studies in non-GERD patients.
- Correlation of GERD severity with metaplastic cardiac mucosa length.
- Development of a biopsy assessment system based on histological findings.
Main Results:
- Cardiac mucosa is identified as abnormal metaplasia of esophageal squamous epithelium due to GERD.
- GERD severity correlates with the extent of metaplastic cardiac mucosa.
- Intestinal metaplasia (Barrett's esophagus) develops within this metaplastic mucosa.
Conclusions:
- A clear sequence from GERD to adenocarcinoma is proposed: GERD -> cardiac metaplasia -> reflux carditis -> intestinal metaplasia -> dysplasia -> adenocarcinoma.
- The term "Barrett's esophagus" is considered confusing and should be discarded.
- The new assessment system effectively correlates biopsy histology with GERD severity.