Cyclooxygenase-2 expression in Barrett's esophagus

Barrett's epithelium is a recognized premalignant condition for esophageal adenocarcinoma. Nonsteroidal antiinflammatory drugs (NSAIDs) decrease the r elative risk of colon cancer in humans and the esophageal tumor load in car cinogen-treated mice. Previous studies provided conflicting results for COX -2 activity in Barrett's mucosa. Pinch mucosal biopsies were collected from Barrett's and adjacent normal esophageal mucosa from 17 patients with Barr ett's esophagus. Low-grade dysplasia was found in seven patients. COX-2 pro tein was undetectable in normal esophageal mucosa. COX-1 protein expression did not vary between normal and Barrett's epithelium. Increased COX-2 prot ein was detected in Barrett's epithelium in seven patients (41%) but did no t differ with or without dysplasia (43% vs 40%). In conclusion, COX-2 prote in is increased in 41% of patients with Barretts epithelium compared to nor mal esophageal mucosa but did not differ with or without dysplasia. COX-2 i nduction may be an early event in the development of Barrett's esophagus.