ARRY334543 is a selective and potent ErbB1(EGFR) and ErbB2(HER2) inhibitor with IC50 of 7 nM and 2 nM, respectively.

ARRY334543 behaves as a reversible ATP-competitive inhibitor with nanomolar potency (Ki=1 nM) both in vitro and in cell-based proliferation assays using A431 and BT-474 cells. ARRY334543 is an AKT pathway inhibitor in cells that contains active ErbB-2 receptors. ARRY334543 suppresses ErbB-2 and ErbB-1 phosphorylation in human cancer cells, such as BT-474 with IC50 of 43 nM) and A431 with IC50 of 36 nM) that overexpress ErbB-2 and ErbB-1, respectively.

CO-1686 (AVL-301)

AZD9291

EMD 1214063

Erlotinib HCl (OSI-744)

Gefitinib (ZD1839)

Afatinib (BIBW2992)

Lapatinib