Abstract
Background
Epidermal growth factor receptor (EGFR) mutation alone may be insufficient to predict clinical outcomes in the response to EGFR-tyrosine kinase inhibitor (TKI) therapy. The secondary mutation T790 M and MET amplification are mechanisms of acquired resistance to EGFR-TKI in approximately 50 % of patients, but the remaining mechanisms are unknown.
Methods
Eight metastatic lesions and specimens from 41 non-small cell lung carcinoma (NSCLC) patients harbouring activating EGFR mutations who underwent surgical resection and EGFR-TKI therapy were available. Immunohistochemistry was used to evaluate E-cadherin, β-catenin, and PTEN. Chromogenic in situ hybridisation and silver-enhanced in situ hybridisation were used to evaluate EGFR and MET amplification.
Results
Patients with E-cadherin/β-catenin alteration showed a poor objective response rate (ORR) (p = 0.005) and shorter overall survival (p = 0.059). Additionally, β-catenin alteration was associated with a poor ORR (p = 0.012). Of the metastatic tumours, three cases (37.5 %) showed the acquisition of altered E-cadherin/β-catenin and PTEN loss and two cases (25 %) demonstrated MET/EGFR amplification.
Conclusions
Altered E-cadherin/β-catenin expression in NSCLC harbouring EGFR mutations was associated with a poor response to EGFR-TKI. During metastatic progression, changes in E-cadherin/β-catenin were found. These results may suggest that E-cadherin/β-catenin alteration is related to poor TKI response and resistance.
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Acknowledgment
This work was supported by the Korea Healthcare Technology R&D project, Ministry of Health & Welfare, Republic of Korea [A111405].
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The authors declare no conflicts of interest.
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Seol Bong Yoo and Yu Jung Kim contributed equally to this article.
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Yoo, S.B., Kim, Y.J., Kim, H. et al. Alteration of the E-cadherin/β-Catenin Complex Predicts Poor Response to Epidermal Growth Factor Receptor-Tyrosine Kinase Inhibitor (EGFR-TKI) Treatment. Ann Surg Oncol 20 (Suppl 3), 545–552 (2013). https://doi.org/10.1245/s10434-013-2970-1
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DOI: https://doi.org/10.1245/s10434-013-2970-1