Clinical implications of microsomal prostaglandin E synthase-1 overexpression in human non-small-cell lung cancer

Hao Wei Wang, Chung Tsen Hsueh, Chien Fu Jeff Lin, Teh Ying Chou, Wen Hu Hsu, Liang Shun Wang, Yu Chung Wu

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Background: Microsomal prostaglandin E synthase-1 (mPGES-1) has recently been found to overexpress in human cancers, including non-small-cell lung cancer (NSCLC). However, the clinical value is largely unknown. The aim of this study was to investigate the associations between mPGES-1 expression in NSCLC and the clinical characteristics and survival outcome. Methods: Between 2001 and 2003, paired fresh tumorous and nontumorous samples were prospectively procured from patients undergoing surgery for NSCLC. The expression of mPGES-1 was assessed by using Western blot in 93 subjects and reverse transcriptase-polymerase chain reaction in 35. Overexpression of mPGES-1 was defined as a more than 2-fold expression in the tumorous sample compared with the corresponding nontumorous one. Immunohistochemistry was used to confirm its localization to the tumor cells. In a subset of 30 cases, cyclooxygenase-2 (COX-2) was also analyzed to assess its association with mPGES-1. Results: The protein and messenger RNA of mPGES-1 were both expressed at higher levels in the tumor samples (P <.001 and P = .006, respectively). The expressions of mPGES-1 and COX-2 were unrelated (P = .715). Overexpression of mPGES-1 protein was observed in 61 (65.6%) of 93 patients, but it was not significantly associated with the clinicopathologic characteristics or overall and disease-free survivals. However, mPGES-1 overexpression seemed to be associated with the likelihood of subsequent pulmonary metastases and a lower tendency for developing bony metastases (P = .001 and P = .006, respectively). Conclusions: Our results demonstrated that mPGES-1 was overexpressed in NSCLC, unassociated with COX-2. Overexpression of mPGES-1 per se was not a prognostic indicator, but it might be implicated in the organ preference of metastasis. Published by Springer Science+Business Media, Inc.

Original languageEnglish
Pages (from-to)1224-1234
Number of pages11
JournalAnnals of Surgical Oncology
Volume13
Issue number9
DOIs
Publication statusPublished - Sep 2006
Externally publishedYes

Keywords

  • Cyclooxygenase inhibitors
  • Non-small-cell lung cancer
  • Prostaglandin-endoperoxide synthase
  • Prostaglandins

ASJC Scopus subject areas

  • Surgery
  • Oncology

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