BAY 1436032

BAY 1436032 exhibits an IC50 of 15 nM for mutant IDH1R132H protein and virtually no effect on wild-type IDH1 and the structurally related IDH2 proteins with IC50 of 20 and >100 µM, respectively. BAY 1436032 not only reduces 2-HG levels in cells with the IDH1R132H or the IDH1R132C mutations, but also in those with the R132G, R132S or R132L mutations with equal efficiency. There is no inhibition of IDH2 R172M. BAY 1436032 reduces proliferation and induces differentiation in primary glioma cultures. BAY 1436032 reveals low metabolic clearance (CL) in vitro in rat hepatocytes and mice liver microsomes^[1].

Cells are seeded with 4000 cells/well in 96-well plates for suspension cells. For each condition, three wells are used. The cells are treated 1 day after seeding with BAY 1436032 at concentrations of 500 nM and 2.5 µM and DMSO as solvent control. Subsequently, measurements are performed on days 7, 14 and 21 after the first inhibitor treatment. The cells receive fresh drug-containing medium after the first 7 and 14 days of treatment. Plates are measured with a microplate reader.

The pharmacokinetic properties of BAY 1436032 allow for oral administration. In vivo pharmacokinetics (PK) in rats shows low CL and high oral bioavailability. Oral administration of BAY 1436032 confers a survival benefit to mice transplanted with IDH1 mutant tumors. BAY 1436032 induces differentiation in intracranial xenografts^[1].