AZD9291 is an oral, irreversible, and mutant-selective EGFR inhibitor with IC50 of 12.92, 11.44 and 493.8 nM for Exon 19 deletion EGFR, L858R/T790M EGFR, and WT EGFR, respectively. In vivo, AZD9291 shows significantly more potent inhibition of proliferation in mutant EGFR cell lines when compared with wild-type. AZD9291(5mg/kg p.o.) causes profound regression of tumors across EGFRm+ (PC9) and EGFRm+/T790M (H1975) tumor models with profound inhibition of EGFR phosphorylation and key downstream signaling pathways such as AKT and ERK .
|Cell lines||PC-9, H1975, LOVO, H1650 and H3255 lines|
|Preparation method||In vitro EGFR phosphorylation assays Cells were treated for 2 h with a dose-response of each drug. 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 a modified R&D Systems DuoSet Human phospho-EGFR ELISA (36).|
|Animal models||PC-9 and H1975 cells subcutaneous xenograft models|
|Dosages||5 mg/kg/day QD|
|Body Surface Area (m2)||0.007||0.025||0.15||0.05||0.02||0.5|
|Animal A (mg/kg) = Animal B (mg/kg) multiplied by||Animal B Km|
|Animal A Km|
For example, to modify the dose of resveratrol used for a mouse (22.4 mg/kg) to a dose based on the BSA for a rat, multiply 22.4 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for resveratrol of 11.2 mg/kg.
|Source||Nat Med (2015). Figure 1. AZD9291|
|Method||digital PCR (ddPCR) assay|
|Cell Lines||Ba/F3 cells|
|Incubation Time||72 h|
|Results||Although a more comprehensive analysis of plasma and biopsy tissue collected after resistance develops will be needed to provide greater clarity on C797S mutation incidence, the emergence of this mutation in a marked proportion of AZD9291-resistant patients suggests that development of targeted therapies with the ability to overcome the C797S mutation is warranted.|
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