In vitro activity: AZ5104 shows great potency against ex19del (2 nM in PC-9), T790M (2 nM in H1975), and wild-type EGFR (33 nM in LOVO) cell lines. AZ5104 causes inhibition of cell viability with IC50 of 3.3 nM, 2.6 nM, 80 nM, and 53 nM for H1975 (T790M/L858R), PC-9 (ex19del), Calu 3 (WT), and NCI-H2073 (WT), respectively.

Kinase Assay: Kinase assays are performed using peptide or protein substrates in a filter-binding radioactive ATP transferase assay for protein kinases, or lipid substrates and HTRF assay for lipid kinase.

Cell Assay: Cells were treated for 2 h with a dose-response of each drug (AZ-5104). Wild-type cells were stimulated for 10 minutes with 25 ng/mL of EGF before lysis. Level of EGFR phosphorylation was quantified in cell extracts using ELISA