TAS-121

TAS-121 is an orally active, selective, covalent, third-generation mutant EGFR-tyrosine kinase inhibitor (EGFR-TKI). TAS-121 inhibits the L858R mutation (IC₅₀=1.7 nM), Ex19del mutation (IC₅₀=2.7 nM), L858R/T790M mutation (IC₅₀=0.56 nM) and Ex19del/T790M mutation (IC₅₀=1.1 nM) and wild-type EGFR (IC₅₀=8.2 nM). TAS-121 inhibits HER2 and HER4 with IC₅₀s of 110 and 2.6 nM, respectively. TAS-121 inhibits phosphorylation of EGFR and its downstream signaling targets to block cell proliferation. TAS-121 induces apoptosis and displays antitumor activity in SW48 (EGFR G719S) and NCI-H1975 (EGFR L858R/T790M) xenograft models.

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