Abstract:Background: HER2 is a tyrosine kinase receptor belonging to the human epidermal receptor family and is considered an important proto-oncogene in the biology of breast carcinoma. HER2 overexpression is determined by a +3 score on the immunohistochemistry (IHC) assay. In addition, tumors with IHC results of +1 or +2 with ISH negative were defined as HER2-low. Recent studies have shown that the clinicopathological characteristics of HER2-low tumors, pointing out potential differences regarding hormone receptor st… Show more
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