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Clinical Significance of SH2B1 Adaptor Protein Expression in Non-small Cell Lung Cancer

  • Zhang, Hang (Department of Cardiothoracic Surgery Xiangya Hospital, Central South University) ;
  • Duan, Chao-Jun (Medical Science Institute, Xiangya Hospital, Central South University) ;
  • Chen, Wei (Department of Cardiothoracic Surgery Xiangya Hospital, Central South University) ;
  • Wang, Shao-Qiang (Department of Cardiothoracic Surgery Xiangya Hospital, Central South University) ;
  • Zhang, Sheng-Kang (Department of Cardiothoracic Surgery Xiangya Hospital, Central South University) ;
  • Dong, Shuo (Department of Cardiothoracic Surgery Xiangya Hospital, Central South University) ;
  • Cheng, Yuan-Da (Department of Cardiothoracic Surgery Xiangya Hospital, Central South University) ;
  • Zhang, Chun-Fang (Department of Cardiothoracic Surgery Xiangya Hospital, Central South University)
  • Published : 2012.05.30

Abstract

The SH2B1 adaptor protein is recruited to multiple ligand-activated receptor tyrosine kinases that play important role in the physiologic and pathologic features of many cancers. The purpose of this study was to assess SH2B1 expression and to explore its contribution to the non-small cell lung cancer (NSCLC). Methods: SH2B1 expression in 114 primary NSCLC tissue specimens was analyzed by immunohistochemistry and correlated with clinicopathological parameters and patients' outcome. Additionally, 15 paired NSCLC background tissues, 5 NSCLC cell lines and a normal HBE cell line were evaluated for SH2B1 expression by RT-PCR and immunoblotting, immunofluorescence being applied for the cell lines. Results: SH2B1 was found to be overexpressed in NSCLC tissues and NSCLC cell lines. More importantly, high SH2B1 expression was significantly associated with tumor grade, tumor size, clinical stage, lymph node metastasis, and recurrence respectively. Survival analysis demonstrated that patients with high SH2B1 expression had both poorer disease-free survival and overall survival than other patients. Multivariate Cox regression analysis revealed that SH2B1 overexpression was an independent prognostic factor for patients with NSCLC. Conclusions: Our findings suggest that the SH2B1 protein may contribute to the malignant progression of NSCLC and could offer a novel prognostic indicator for patients with NSCLC.

Keywords

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