Description
GDC-0032 is a potent, next-generation β isoform-sparing PI3K inhibitor targeting PI3Kα/δ/γ with IC50 of 0.29 nM/0.12 nM/0.97nM, >10 fold selective over β.
Storage
2 years -20 centigrade Powder; 2 weeks 4 centigrade in DMSO; 6 months -80 centigrade in DMSO.
Targets
PI3Kα, PI3K β, PI3K δ, PI3Kγ
IC50
0.29 nM; 9.1 nM; 0.12 nM; 0.97 nM
Molecular Formula
C24H28N8O2
Chemical Name
1H-Pyrazole-1-acetamide, 4-[5,6-dihydro-2-[3-methyl-1-(1-methylethyl)-1H-1,2,4-triazol-5-yl]imidazo[1,2-d][1,4]benzoxazepin-9-yl]-α,α-dimethyl-
Solubility
DMSO mg/mL; Water mg/mL; Ethanol mg/mL
In vitro
GDC-0032 is an orally bioavailable, potent, and selective inhibitor of Class I PI3Kα, δ, and γ isoforms, with 30 fold less inhibition of the PI3K β isoform relative to the PI3Kα isoform. Preclinical data show that GDC-0032 has increased activity against PI3Kα isoform (PIK3CA) mutant and HER2-amplified cancer cell lines. GDC-0032 inhibits MCF7-neo/HER2 cells proliferation with IC50 of 2.5 nM.
In vivo
GDC-0032 pharmacokinetics is approximately dose proportional and time independent with a mean t1/2 of 40 hours. The combination of GDC-0032 enhances activity of fulvestrant resulting in tumor regressions and tumor growth delay (91% tumor growth inhibition (TGI)). In addition, the combination of GDC-0032 with tamoxifen enhances the efficacy of tamoxifen in vivo (102%TGI for GDC-0032).
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