4.6 Article

Effective Therapeutic Targeting of the Overexpressed HER-2 Receptor in a Highly Metastatic Orthotopic Model of Esophageal Carcinoma

Journal

MOLECULAR CANCER THERAPEUTICS
Volume 9, Issue 7, Pages 2037-2045

Publisher

AMER ASSOC CANCER RESEARCH
DOI: 10.1158/1535-7163.MCT-10-0209

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  1. Deutsche Forschungsgemeinschaft [GR 3484/1-1]

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This study aimed to determine the targeted efficacy of trastuzumab (Herceptin) on human epidermal growth factor receptor 2 (HER-2)-overexpressing metastatic esophageal cancer in an orthotopic mouse model. HER-2 overexpression and amplification of human esophageal primary and metastatic tumors were shown with HER-2-fluorescence in situ hybridization analysis and HER-2 immunostaining. Following orthotopic implantation with the HER-2-overexpressing OE19 human esophageal cancer cell line, mice were treated with trastuzumab. Sequential magnetic resonance imaging was used to monitor primary tumor and metastasis during treatment. After six weeks, a significant inhibition of primary tumor development was imaged in trastuzumab-treated animals in comparison with the control group. Trastuzumab treatment also led to a reduction of lymphatic metastasis. Thus, HER-2 targeted therapy with trastuzumab resulted in a significant primary tumor growth reduction as well as a decrease of lymph node metastases in the orthotopic model of metastatic esophageal carcinoma. The results of the present study suggest the clinical use of trastuzumab for HER-2-overexpressing esophageal cancer, which is a significant fraction of the patient population. Treatment of this highly treatment-resistant disease with trastuzumab in the adjuvant setting to prevent lymph node metastasis after primary tumor resection is suggested by the data in this report. Mol Cancer Ther; 9(7); 2037-45. (C) 2010 AACR.

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