Prognostic value of Bmi-1 oncoprotein expression in NSCLC patients: a tissue microarray study

K Vrzalikova, J Skarda, J Ehrmann, Paul Murray, E Fridman, J Kopolovic, P Knizetova, M Hajduch, J Klein, V Kolek, L Radova, Z Kolar

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Abstract

Purpose Bmi-1 is a Polycomb group member which participates in many physiological processes as well as in a wide spectrum of cancers. The aim of this study was to investigate Bmi-1 expression in non-small cell lung cancer (NSCLC) in respect to clinicopathological features and therapeutic outcomes. Methods Immunohistochemical staining for Bmi-1 was performed on tissue microarrays (TMAs) constructed from 179 formalin-fixed and paraffin-embedded NSCLC samples (106 squamous, 58 adeno-, and 15 large cell carcinomas). Data were subject to statistical analysis by SPSS. Results Overall evaluation of all tumor cases showed that 20 (11.43%) were negative, 37 (21.14%) showed weak, 65 (37.14%) moderate and 57 (32.57%) strong nuclear positivity for Bmi-1. Statistical analysis of our data revealed that the expression of Bmi-1 was significantly higher in stage III (P = 10(-6)) and stage IV (P = 10(-5)) tumors compared to stages I and II tumors. The administration of adjuvant chemotherapy significantly increased DFS at stage I and II patients who did not express Bmi-1 when compared to their Bmi-1 positive counterparts (P = 0.05). Conclusions Our results suggest that Bmi-1 is significantly associated with progression of NSCLC and might serve as a prognostic marker of adverse disease outcome.
Original languageEnglish
Pages (from-to)1037-1042
Number of pages6
JournalJournal of Cancer Research and Clinical Oncology
Volume134
Issue number9
DOIs
Publication statusPublished - 1 Sep 2008

Keywords

  • polycomb genes
  • non-small cell lung cancer
  • tissue microarray
  • Bmi-1 oncogene

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