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Reduction in HER2 protein expression in a breast tumor HER2 positive after only one injection of Trastuzumab: a case report

Reduction in HER2 protein expression in a breast tumor HER2 positive after only one injection of Trastuzumab: a case report,10.4076/1757-1626-2-8099,C

Reduction in HER2 protein expression in a breast tumor HER2 positive after only one injection of Trastuzumab: a case report  
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HER-2 is overexpressed in 20 to 30% of breast cancer. Generally, metastases of a breast tumor have the same HER-2 status, although some discordances were reported. We report a case of reduction in HER-2 expression assessed by immunohistochemistry, following one day of a Trastuzumab injection, of a metastatic breast cancer to lymph nodes. Initially, the breast tumor HER-2 status was positive according to the same technique. We raise a hypothesis about technical interference and discuss the case in the framework of the existing literature.
Journal: Cases Journal - Cases J , vol. 2, no. 1, 2009
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