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HER2 is the target of the monoclonal antibody trastuzumab (marketed as Herceptin). Trastuzumab is effective only in cancers where HER2 is over-expressed. One year of trastuzumab therapy is recommended for all patients with HER2-positive breast cancer who are also receiving chemotherapy. [33] Twelve months of trastuzumab therapy is optimal.
In early-stage HER2-positive breast cancer, trastuzumab-containing regimens improved overall survival (Hazard ratio (HR) = 0.66) and disease-free survival (HR = 0.60). [39] Increased risk of heart failure (RR = 5.11) and decline in left ventricular ejection fraction ( relative risk RR = 1.83) were seen in these trials as well. [ 39 ]
In the EMILIA clinical trial [15] of women with advanced HER2 positive breast cancer who were already resistant to trastuzumab alone, it improved median overall survival by 5.8 months (30.9 months vs. 25.1 months) compared to the combination of lapatinib and capecitabine. [14]
Many researchers have recommended a) conducting a much larger study to verify the results suggesting that the addition of a HER2/neu inhibitor to standard therapeutic regimens improves the overall survival of individuals with HER2/neu-positive PACB; [11] b) studies to determine if androgen receptor inhibitors (e.g. bicalutamide) [5] or ...
HER2-positive tumors may be treated with the targeted medical therapy (e.g., trastuzumab). Further information: Breast cancer management and Breast cancer § Management Treatment of non-metastatic invasive breast cancer can vary based on staging, usually early stage (stages I and II) versus locally advanced (stage III).
HER2-low has some HER2 proteins on the cell surface, but not enough to be classified as HER2-positive. [4] Trastuzumab deruxtecan is the first approved therapy by the US Food and Drug Administration (FDA) targeted to people with the HER2-low breast cancer subtype. [4] DNA-based classification.
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