Tucatinib (Irbinitinib, ONT-380, ARRY-380) 是一种具有口服活性、可逆的、ATP竞争性的的ErbB2（HER2）小分子抑制剂。在细胞实验中，ARRY-380对ErbB-2和p95 HER2的IC50s分别为8 nM和7 nM，对HER2的选择性是对EGFR的500倍。具有潜在的抗肿瘤活性。 Information Tucatinib (Irbinitinib, ONT-380, ARRY-380) is an oral, potent, selective, reversible and ATP-competitive small-molecule inhibitor ofErbB-2(also called HER2) with IC50s of 8 nM and 7 nM for ErbB-2 and p95 HER2, respectively in cell-based assays, showing ~500-fold selective for HER2 vs EGFR. It has potential antineoplastic activity. Targets p95 HER2 (Cell-based assay); ErbB2 (Cell-based assay) 7 nM; 8 nM In vitro The compound is a reversible, ATP-competitive inhibitor with nanomolar potency against ErbB2 in both in vitro and in cell-based assays. Incell-based assays, ARRY-380 is ~500-fold selective for HER2 vs. EGFR and is equipotent against truncated p95-HER2. In vivo ARRY-380 significantly inhibits tumor growth in multiple HER2-dependent tumor xenograft models. It shows excellent activity in numerous mouse tumor models including breast (BT-474, MDA-MB-453), ovarian (SKOV-3) and gastric (N87) carcinoma models. In the BT-474 model, ARRY-380 demonstrated significant dose-related tumor growth inhibition (TGI; 50% at 50 mg/kg/d and 96% at 100 mg/kg/d) with numerous partial regressions (>50% reduction from baseline size).