Loss of the CBX7 protein expression correlates with a more aggressive phenotype in pancreatic cancer

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2010
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Karamitopoulou, Eva
Pallante, Pierlorenzo
Zlobec, Inti
Tornillo, Luigi
Carafa, Vincenza
Schaffner, Thomas
Borner, Markus
Diamantis, Ioannis
Esposito, Francesco
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European Journal of Cancer. 2010, 46(8), pp. 1438-1444. ISSN 0959-8049. eISSN 1879-0852. Available under: doi: 10.1016/j.ejca.2010.01.033
Zusammenfassung

Polycomb group (PcG) proteins function as multiprotein complexes and are part of a gene regulatory mechanism that determines cell fate during normal and pathogenic development. Several studies have implicated the deregulation of different PcG proteins in neoplastic progression. Pancreatic ductal adenocarcinoma is an aggressive neoplasm that follows a multistep model of progression through precursor lesions called pancreatic intraepithelial neoplasia (PanIN). Aim of this study was to investigate the role of PcG protein CBX7 in pancreatic carcinogenesis and to evaluate its possible diagnostic and prognostic significance. We analysed by immunohistochemistry the expression of CBX7 in 210 ductal pancreatic adenocarcinomas from resection specimens, combined on a tissue microarray (TMA) including additional 40 PanIN cases and 40 normal controls. The results were evaluated by using receiver operating characteristic (ROC) curve analysis for the selection of cut-off scores and correlated to the clinicopathological parameters of the tumours and the outcome of the patients. Expression of E-cadherin, a protein positively regulated by CBX7, was also assessed. A significantly differential, and progressively decreasing CBX7 protein expression was found between normal pancreatic tissue, PanINs and invasive ductal adenocarcinoma. Loss of CBX7expression was associated with increasing malignancy grade in pancreaticadenocarcinoma, whereas the maintenance of CBX7 expression showed a trend toward a longer survival. Moreover, loss of E-cadherin expression was associated with loss of CBX7 and with a trend towards worse patient survival.

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ISO 690KARAMITOPOULOU, Eva, Pierlorenzo PALLANTE, Inti ZLOBEC, Luigi TORNILLO, Vincenza CARAFA, Thomas SCHAFFNER, Markus BORNER, Ioannis DIAMANTIS, Francesco ESPOSITO, Thomas BRUNNER, Arthur ZIMMERMANN, Antonella FEDERICO, Luigi TERRACCIANO, Alfredo FUSCO, 2010. Loss of the CBX7 protein expression correlates with a more aggressive phenotype in pancreatic cancer. In: European Journal of Cancer. 2010, 46(8), pp. 1438-1444. ISSN 0959-8049. eISSN 1879-0852. Available under: doi: 10.1016/j.ejca.2010.01.033
BibTex
@article{Karamitopoulou2010-05prote-8328,
  year={2010},
  doi={10.1016/j.ejca.2010.01.033},
  title={Loss of the CBX7 protein expression correlates with a more aggressive phenotype in pancreatic cancer},
  number={8},
  volume={46},
  issn={0959-8049},
  journal={European Journal of Cancer},
  pages={1438--1444},
  author={Karamitopoulou, Eva and Pallante, Pierlorenzo and Zlobec, Inti and Tornillo, Luigi and Carafa, Vincenza and Schaffner, Thomas and Borner, Markus and Diamantis, Ioannis and Esposito, Francesco and Brunner, Thomas and Zimmermann, Arthur and Federico, Antonella and Terracciano, Luigi and Fusco, Alfredo}
}
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