Theliatinib (HMPL-309) is a potent EGFR inhibitor with a Ki value of 0.05 nM for EGFR and IC50 values of 3 nM and 22 nM for EGFR and EGFR T790M/L858R mutant, respectively. It is more than 50-fold selective for EGFR over 72 other kinases.
Compared with erlotinib or gefitnib, theliatinib has stronger binding affinity to wild-type EGFR and is more difficult to be replaced by ATP, which makes theliatinib have better target binding effect, and the EGFR-activated tumors have stronger antitumor activity.