In this article, we will discuss Mobocertinib (Mechanism of Action). So, let’s get started.
Mechanism of Action
Mobocertinib is a kinase inhibitor of the epidermal growth factor receptor (EGFR) that irreversibly binds to and inhibits EGFR exon 20 insertion mutations at lower concentrations than wild type (WT) EGFR. Two pharmacologically-active metabolites (AP32960 and AP32914) with similar inhibitory profiles to mobocertinib have been identified in the plasma after oral administration of mobocertinib. In vitro, mobocertinib also inhibited the activity of other EGFR family members (HER2 and HER4) and one additional kinase (BLK) at clinically relevant concentrations (IC50 values <2 nM). In cultured cell models, mobocertinib inhibited the proliferation of cells driven by different EGFR exon 20 insertion mutation variants at 1.5- to 10-fold lower concentrations than WT-EGFR signaling inhibition. In animal tumor implantation models, mobocertinib exhibited anti-tumor activity against xenografts with the EGFR exon 20 insertions NPH or ASV.
Mobocertinib exposure-response relationships and the time course of pharmacodynamic response are unknown.
The largest mean increase in QTc was 23.0 msec (UCI: 25.5 msec) following administration of EXKIVITY 160 mg once daily. The increase in QTc interval was concentration-dependent.
The largest mean increase in the PR interval was 12.4 msec (UCI: 15.0 msec). PR interval prolongation >220 msec occurred in 5% of patients taking EXKIVITY 160 mg once daily.