AV-412(MP-412) is a potent dual inhibitor of EGFR and ErbB2(IC50=19 nM) tyrosine kinases, including the mutant EGFR(L858R IC50=0.51 nM, T790M IC50=0.79 nM); inhibits autophosphorylation of EGFR and ErbB2 with IC(50) of 43 and 282 nM, respectively.
In animal studies using cancer xenograft models, MP-412 (30 mg/kg) demonstrated complete inhibition of tumor growth of the A431 and BT-474 cell lines, which overexpress EGFR and ErbB2, respectively. MP-412 suppressed autophosphorylation of EGFR and ErbB2 at the dose corresponding to its antitumor efficacy. MP-412 showed a significant antitumor effect on the ErbB2-overexpressing breast cancer KPL-4 cell line, which is resistant to gefitinib. MP-412 showed potent activity in KPL-4 and DU145 xenografts, in which lapatinib was ineffective. MP-412 also inhibited tumor models in which conventional chemotherapies were less effective. |
