Hypoxia-associated Markers in Gastric Carcinogenesis and HIF-2alpha in Gastric and Gastro-oesophageal Cancer Prognosis

Overview

Journal Br J Cancer

Specialty Oncology

Date 2008 Feb 20

PMID 18283323

Citations 12

Authors

E A Griffiths

S A Pritchard

S M McGrath

H R Valentine

P M Price

I M Welch

C M L West

Affiliations

Soon will be listed here.

Abstract

The study investigated hypoxia-associated markers (HIF-2alpha, Epo, Epo-R, Glut-1 and VEGF) along with Ki-67 in a gastric carcinogenesis model, and the prognostic significance of hypoxia-inducible factor (HIF)-2alpha in surgically treated gastro-oesophageal cancer. Protein expression was examined using immunohistochemistry on formalin-fixed, paraffin-embedded biopsies of normal mucosa (n=20), Helicobacter pylori-associated gastritis (n=24), intestinal metaplasia (n=24), dysplasia (n=12) and intestinal (n=19) and diffuse (n=21) adenocarcinoma. Relationships between HIF-2alpha expression and prognosis were assessed in resection specimens from 177 patients with gastric and gastro-oesophageal junction adenocarcinoma. Expression of all markers increased with progression along the gastric carcinogenesis sequence (P=0.0001). Hypoxia-inducible factor-2alpha was expressed in 63% of 177 resection specimens and at a high level in 44%. The median overall survival in patients with HIF-2alpha-expressing tumours was 22 (95% CI 18-26) months, whereas those with HIF-2alpha-negative tumours had a median survival of 37 (95% CI 29-44) months (P=0.015). Hypoxia-inducible factor-2alpha had no independent prognostic significance in multivariate analysis. In view of the lack of independent prognostic significance, HIF-2alpha has no role as a routine prognostic indicator. However, the high expression of HIF-2alpha suggests that it may be of value as a potential therapeutic target.

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