title: Loss of epithelial membrane protein-2 expression confers an independent prognosticator in nasopharyngeal carcinoma: a cohort study.
abstract: OBJECTIVE
  To evaluate the expression of epithelial membrane protein-2 (EMP2) protein and its clinicopathological associations in patients with nasopharyngeal carcinoma.
  
  
  METHODS
  Retrospective population-based cohort study.
  
  
  METHODS
  This study was based on a biobank in Chi-Mei Medical Center (Tainan, Taiwan) from 1993 to 2002.
  
  
  METHODS
  Biopsies of 124 consecutive nasopharyngeal carcinoma patients without initial distant metastasis and treated with consistent guidelines were assessed. Immunoexpressions of EMP2 were analysed and the outcomes were correlated with clinicopathological features and patient survivals.
  
  
  METHODS
  Immunoexpressions of EMP2 were analyzed and the outcomes were correlated with clinicopathological features and patient survivals.
  
  
  RESULTS
  Loss of EMP2 expression (49.2%) was correlated with advanced primary tumour (p=0.044), nodal status (p=0.045) and the 7th American Joint Committee on Cancer stage (p=0.027). In multivariate analyses, loss of EMP2 expression emerged as an independent prognosticator for worse disease-specific survival (DSS; p=0.015) and local recurrence-free survival (LRFS; p=0.030), along with the American Joint Committee on Cancer stages III-IV (p=0.034, DSS; p=0.023, LRFS).
  
  
  CONCLUSIONS
  Loss of EMP2 expression is common and associated with adverse prognosticators and might confer tumour aggressiveness through hampering its interaction with specific membrane protein(s) and hence the downstream signal transduction pathway(s).
authors.affiliation: Department of Emergency Medicine, Chi-Mei Medical Center, Tainan, Taiwan.
authors.forename: Yi-Hsien
authors.initials: YH
authors.lastname: Chen
authors.forename: Li-Ching
authors.initials: LC
authors.lastname: Wu
authors.forename: Wen-Ren
authors.initials: WR
authors.lastname: Wu
authors.forename: Hung-Jung
authors.initials: HJ
authors.lastname: Lin
authors.forename: Sung-Wei
authors.initials: SW
authors.lastname: Lee
authors.forename: Ching-Yih
authors.initials: CY
authors.lastname: Lin
authors.forename: Shih-Lun
authors.initials: SL
authors.lastname: Chang
authors.forename: Nan-Haw
authors.initials: NH
authors.lastname: Chow
authors.forename: Hsuan-Ying
authors.initials: HY
authors.lastname: Huang
authors.forename: Chien-Feng
authors.initials: CF
authors.lastname: Li
authors.forename: Han-Ping
authors.initials: HP
authors.lastname: Hsu
authors.forename: Yow-Ling
authors.initials: YL
authors.lastname: Shiue