AZD8186 potently inhibits p-Akt in MDA-MB-468 cells sensitive to PI3Kβ inhibition and Jeko B cells sensitive to PI3Kδ inhibition with IC50 of 3 nM and 4 nM, respectively. AZD8186 shows preferred growth inhibition activity in most PTEN deficient cell lines with GI50 of <1 μM.
In vivo
In nude mice bearing PTEN-deficient PC3 prostate tumor xenografts, AZD8186 (100 mg/kg, p.o.) strongly inhibits Akt phosphorylation levels, and causes significant tumor growth inhibition. When used in combination with ABT, AZD8186 (60 mg/kg, p.o.) results in complete inhibition of tumor growth. In the mouse PTEN-null TNBC models HCC70 and MDA-MB-468, and the prostate models HID28, AZD8186 (50 mg/kg, p.o.) also inhibits the growth of tumors. Combination therapy using AZD8186 with androgen deprivation results in long-lasting tumor regression, which persisted after treatment cessation.