“…Several retrospective Level of Evidence III-IV studies 74 support repeat tumor resections, as long as the patient's performance status is not low and preoperative tumor volume is not excessive. 1,5,16,26,30,55 A randomized, double-blind, placebo-controlled control trial also supported the implantation of carmustine (BCNU) wafers in tumor cavities after repeat operation. 10 Although salvage temozolomide had previously been used for recurrent GBM, 9,56,80 recent Level II evidence clinical studies in patients with recurrent GBM have demonstrated that salvage chemotherapy combining bevacizumab, an antiangiogenic agent, with cytotoxic drugs can extend progression-free survival and overall survival to 6.1 and 9.2 months, respectively.…”