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Clinical Outcomes of Downregulation of E-cadherin Gene Expression in Non-small Cell Lung Cancer

  • Zheng, Shi-Ying (Department of Cardio-thoracic Surgery, the First Affiliated Hospital of Soochow University) ;
  • Hou, Jing-Yu (The First Affiliated Hospital of Xinxiang Medical University) ;
  • Zhao, Jun (Department of Cardio-thoracic Surgery, the First Affiliated Hospital of Soochow University) ;
  • Jiang, Dong (Department of Cardio-thoracic Surgery, the First Affiliated Hospital of Soochow University) ;
  • Ge, Jin-Feng (Department of Cardio-thoracic Surgery, the First Affiliated Hospital of Soochow University) ;
  • Chen, Sheng (Huaian No.1 People's Hospital, Nanjing Medical University)
  • Published : 2012.04.30

Abstract

Objective: To investigate the promoter methylation status of the E-cadherin gene in non-small cell lung cancer (NSCLC) and its association with clinical pathological parameters, and to explore the relationship between downregulation of E-cadherin gene expression and the methylation status of its promoter region. Methods: Nested methylation-specific PCR was performed to examine CpG methylation within the 5' CpG island of the E-cadherin gene in lung cancer and para-cancerous tissue from 37 patients with primary non-small cell lung cancer. Quantitative real-time PCR was performed to measure the level of E-cadherin mRNA. Results: Of thirty-seven cases, 12 (32.4%) samples showed aberrant CpG methylation in tumor tissues compared with the corresponding normal tissues. In addition, a reduction in E-cadherin mRNA levels was observed in 11 of the 12 (91.7%) tumor tissues carrying a methylated E-cadherin gene. However, only 10 (43.5%) cases displayed reduced mRNA levels in tumor tissues from the remaining 23 cases (excluding 2 samples from which mRNA was unavailable) without methylation events. Downregulation of E-cadherin gene expression significantly correlated with the promoter methylation status of this gene. Conclusion: These results provide strong evidence that the methylation status of E-cadherin gene contributes to a reduction in the expression of E-cadherin mRNA, and may play a role in the development and progression of NSCLC.

Keywords

References

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