Relapsed high-grade gliomas (HGG) respond poorly to known chemotherapeutic agents with a median survival of 3 to 6 months. Several phase II trials of Bevacizumab for salvage therapy, reported excellent response rates. The optimal dose of Bevacizumab in GBM has not been defined to date. We performed a prospective phase II trial of bevacizumab using 5 mg/kg every 2 weeks.