Targeting HER2-low in metastatic breast cancer: an evolving treatment paradigm
Charlie Yang1, Christine Brezden-Masley2, Anil Abraham Joy3
1Tom Baker Cancer Centre, University of Calgary, 1331 29 Street NW, Calgary, AB T2N 4N2, Canada.
Abstract:
The results of the Phase III DESTINY-Breast04 trial of trastuzumab deruxtecan (T-DXd) are leading to a shift in both the classification and treatment of human epidermal growth factor receptor 2 (HER2)-negative metastatic breast cancer. In this trial, T-DXd was associated with a substantial survival benefit among patients with hormone receptor-positive and hormone receptor-negative disease and low expression of HER2, a biomarker previously considered unactionable in this treatment setting. Herein, we discuss the evolving therapeutic pathway for HER2-low disease, ongoing clinical trials, and the potential challenges and evidence gaps arising with treatment of this patient population.
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