Abstract

Human epidermal growth factor receptor 2 (HER2) gene amplification or protein overexpression (HER2+) occurs in many gastrointestinal (GI) cancers, and HER2-targeting strategies are improving outcomes. Tucatinib (TUC), approved in multiple regions for HER2+ metastatic breast cancer, is a highly selective HER2-directed tyrosine kinase inhibitor with minimal EGFR inhibition. In patient (pt) derived xenograft models of HER2+ tumors, TUC + trastuzumab (T) showed superior anti-tumor activity compared with either agent alone (Kulukian 2020).

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