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Gefitinib (ZD1839) is an EGFR first-generation inhibitor with oral activity that inhibits the EGFR 19 Del and L858R mutations. Gefitinib has antitumor activity and is used for the treatment of EGFR-mutated non-small-cell lung cancers. Gefitinib administration RESULTS in the development of the EGFR C797S resistance mutation.

HKI-357 is an irreversible dual inhibitor of EGFR and ERBB2 (IC50s: 34 nM and 33 nM), effectively suppressing EGFR autophosphorylation (at Y1068), as well as AKT and MAPK phosphorylation.

MK-8033 is a new and selective dual ATP competitive c-Met/Ron inhibitor (IC50: 1 nM Wt c-Met).