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Abnormal expression of biomarkers in incompletely ablated Barrett's esophagus.

Abstract：

OBJECTIVE:The aim of this study was to evaluate expression of cancer risk-associated biomarkers in columnar epithelium at squamocolumnar junctions produced by an ablation procedure and proton pump inhibitors in incompletely ablated Barrett's esophagus (BE) patients that were nondysplastic prior to ablation. SUMMARY BACKGROUND DATA:Ablation of BE to squamous epithelium is achievable by combining a re-injury method with acid suppression. We previously reported that, when there is complete ablation, the neo-squamous epithelium is normal histologically and in biomarker expression. However, squamous islands observed after prolonged use of PPIs were associated with abnormalities in p53 expression and Ki-67 labeling. METHODS:Twenty-one nondysplastic BE cases with incomplete ablation were evaluated for the expression of Ki-67 (proliferation), cyclooxygenase-2 (COX-2), and p53 by immunohistochemistry. RESULTS:Pre-ablation biopsies showed the normal staining patterns in columnar epithelium, ie, normal Ki-67 labeling, rare positive COX-2 staining of interstitial cells, and negative or mild staining for p53 in the majority of patients' biopsies. However, post-ablation biopsies demonstrated abnormal staining patterns in the glandular area at the new squamocolumnar junctions. In 13 of 21 post-ablation cases (62%), increased Ki-67 staining was seen in BE glands. In 8 of 21 patients (38%), increased COX-2 expression was seen in columnar epithelium. Similarly, in 8 of 21 post-ablation junctions (38%), there was increased p53 staining. CONCLUSIONS:Our findings of increased expression of cancer-associated biomarkers in incompletely ablated BE patients raise a cautionary note regarding this procedure. We hypothesize that newly formed junctions contain cells undergoing replication, differentiation, etc, and are thus more susceptible to genomic damage.

journal_name

Ann Surg

journal_title

Annals of surgery

authors

Dvorak K,Ramsey L,Payne CM,Sampliner R,Fass R,Bernstein H,Prasad A,Garewal H

doi

10.1097/01.sla.0000224913.19922.7e

subject

Has Abstract

pub_date

2006-12-01 00:00:00

pages

1031-6

issue

eissn

0003-4932

issn

1528-1140

pii

00000658-200612000-00025

journal_volume

244

pub_type

杂志文章

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Abnormal expression of biomarkers in incompletely ablated Barrett's esophagus.