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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.

Theliatinib has concentration-dependent antitumor activity in a series of patient-derived esophageal cancer xenograft models. But aberrant activation or genetic mutation of other targets such as PI3K and FGFR attenuates the antitumor activity of EGFR inhibitors, especially theliatinib.

< td style="border-bottom: 1px dotted #ccc;padding: 5px;"> 3 nM

Target	Value
WT EGFR (Cell-free assay)
EGFR T790M/L858R (Cell-free assay)	22 nM

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