Therapeutic combination of a third generation EGFR tyrosine kinase inhibitor and a cyclin d kinase inhibitor
A tyrosine kinase, EGFRT790M technology, applied in the field of cancer treatment of human subjects), can solve the problem of NSCLC can not be cured
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[0146] Example 1: Mechanistic Combination Studies to Demonstrate Target Activity and Combinatorial Effects of Compounds on Proximal Biomarkers.
[0147] This experiment was performed to test the combined effect of Compound A (EGF816) and Compound B (LEE011) on EGFR mutant NSCLC cell lines and to demonstrate that the observed anti-proliferative synergy was determined by mechanistic analysis of proximal readouts. Target efficacy driven.
[0148] Several EGFR mutant NSCLC cell lines were treated with combinations of EGF816 and LEE011 at different concentrations as follows for 72 hours. NCI-H1975 (with mutation L858R, T790M), PC-14 (with mutation ex 19del or exon 19 deletion), HCC827 (with mutation ex19del) and HCC4006 (with mutation ex19del) cells in RPMI-1640 growth medium ( ATCC, catalog number 20-2001), and suspended with 10% fetal bovine serum (GIBCO, catalog number F4135) in a humidified 5% CO2 incubator at 37°C. For mechanistic studies, for HCC827, NCI-H1975, HCC4006, a...
example 2
[0160] Example 2: Long-term viability study: Combination of EGFRi plus CDK4 / 6i slows down the viability of EGFR-mutant NSCLC cells regrowth.
[0161] PC9 (3,000 / well), HCC827 (10,000 / well), HCC4006 (5000 / well) and MGH707 (5000 / well) cells were seeded into 96-well plates, and treated with EGF816 (300nM) alone or with LEE011 (1000nM) combined treatment for four weeks. Drugs are updated twice a week. Cell confluency was used as a surrogate indicator of cell number and was measured by incucyte zoom (Essen Biosciences) at the beginning of treatment and twice weekly thereafter (2x).
[0162] Single-agent treatment with EGF816 resulted in varying degrees of apoptosis and cell cycle arrest in the four EGFR-mutant NSCLC cell lines tested (PC9, HCC827, HCC4006, and MGH707), although in all cases, by the end of the four-week treatment time course These cells were then able to begin to slowly re-grow in the presence of EGFRi. To test whether the regrowth was mediated by residual ac...
example 3
[0163] Example 3: In vivo efficacy studies of Compound A and Compound B alone or in combination
[0164] Combination activity with co-treatment with Compound B and Compound A was observed in vivo in a patient-derived xenograft model harboring EGFR mutations, L858R and T790M, as described below ( Figure 4 ).
[0165] tumor cell culture
[0166] NCI-H1975 cells were grown to mid-log phase in RPMI 1640 medium containing the following: 10% fetal bovine serum, 2 mM glutamine, 100 units / mL penicillin G sodium, 25 μg / mL gentamicin, and 100 μg / mL streptomycin sulfate. The tumor cells were incubated at 37°C in 5% CO 2 and 95% air in tissue culture flasks in a humidified incubator.
[0167] In vivo implantation and tumor growth
[0168] NCI-H1975 cells for implantation into mice were harvested in log phase and resuspended in 50% Matrigel TM (BD Biosciences) in cold PBS. Inject 1 x 107 cells (0.2 mL of cell suspension) subcutaneously into the right flank of each mouse. Whe...
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