AZ32, with enhanced BBB penetration, is highly efficient in vivo as radiosensitizer in syngeneic and human, orthotopic mouse glioma model compared with AZ31. AZ32 is a specific inhibitor of the ATM kinase that possesses good BBB penetration in mouse. Following a single oral dose of AZ32 (200 mg/kg) in mice, the free-brain concentrations of AZ32 are in excess of the cellular IC 50 for approximately 22 hours.
