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Combining trastuzumab and cetuximab combats trastuzumab-resistant gastric cancer by effective inhibition of EGFR/ErbB2 heterodimerization and signaling

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Abstract

The anti-ErbB2 antibody trastuzumab has currently been approved for ErbB2-positive gastric cancer. Despite the effectiveness of trastuzumab, resistance is common. Thus, there is an urgent need to overcome trastuzumab resistance. Here, we obtain a trastuzumab-resistant cell line, which is derived from the human gastric cancer NCI-N87 cell line, by modeling the development of acquired resistance in patients. Our data show that combining trastuzumab and cetuximab leads to a significant decrease in EGFR/ErbB2 heterodimers and signaling compared with either antibody alone, and the combination results in greater antitumor activity against the trastuzumab-resistant NCI-N87 cell line, both in vitro and in vivo, suggesting that a combined EGFR/ErbB2 inhibition may overcome trastuzumab resistance.

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Acknowledgments

We thank Bohua Li for critical comments on the manuscript. This work was supported by the Hebei Medical science research program (20130345) from the Health Department of Hebei Province, and the technology support program (201202) from Harrison International Peace Hospital. The authors thank Ms. Yanchun Meng and Mr. Shi Hu for their technical assistance.

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The authors declare that they have no conflict of interest.

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Correspondence to Lei Zheng or Hongmei Liu.

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Lei Zheng, Wenlong Tan and Jinrong Zhang have contributed equally to this work.

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Zheng, L., Tan, W., Zhang, J. et al. Combining trastuzumab and cetuximab combats trastuzumab-resistant gastric cancer by effective inhibition of EGFR/ErbB2 heterodimerization and signaling. Cancer Immunol Immunother 63, 581–586 (2014). https://doi.org/10.1007/s00262-014-1541-z

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  • DOI: https://doi.org/10.1007/s00262-014-1541-z

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