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

      Cancer Immunology, Immunotherapy
      Animals, Antibodies, Monoclonal, Humanized, administration & dosage, Antineoplastic Combined Chemotherapy Protocols, pharmacology, Apoptosis, drug effects, Blotting, Western, Cell Proliferation, Drug Resistance, Neoplasm, Female, Humans, Immunoprecipitation, Mice, Mice, Inbred BALB C, Protein Multimerization, RNA, Messenger, genetics, Real-Time Polymerase Chain Reaction, Receptor, Epidermal Growth Factor, antagonists & inhibitors, metabolism, Receptor, ErbB-2, Reverse Transcriptase Polymerase Chain Reaction, Signal Transduction, Stomach Neoplasms, drug therapy, pathology, Tumor Cells, Cultured

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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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