Expression of nitric oxide synthase type 3 in reflux-induced esophageal lesions

Rakesh Chandra, G. Kenneth Haines, Brandon G. Bentz, Pinky Shah, Alan M. Robinson, James A. Radosevich

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


BACKGROUND: The expression of endothelial constitutive nitric oxide synthase (NOS3) by squamous dysplasia and carcinomas of the head and neck has previously been described. We sought to compare NOS3 expression in squamous mucosa, glandular metaplasia, and adenocarcinoma of the esophagus. METHODS: Forty paraffin-embedded specimens from 20 patients with adenocarcinoma were stained with anti-NOS3 monoclonal antibody. The percentage of cells stained and the intensity of staining were determined for squamous epithelium, metaplasia, and adenocarcinoma. Staining characteristics were statistically analyzed according to clinical variables. RESULTS: NOS3 expression was significantly higher in adenocarcinoma and squamous epithelium compared with glandular metaplasia. Among the carcinomas, larger tumor size (T3/4), nodal positivity, and advanced TNM stage (III/IV) significantly correlated with increased NOS3 expression. CONCLUSIONS: NOS3 is expressed in refluxinduced lesions of the esophagus. Glandular metaplasia shows basal levels of NOS3 that significantly increase with malignant transformation and tumor progression. The role of free radicals in carcinogenesis is being actively studied.

Original languageEnglish
Pages (from-to)442-447
Number of pages6
JournalOtolaryngology - Head and Neck Surgery
Issue number4
StatePublished - Apr 2001


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