DB107-Retroviral Replicating Vector (RRV) Combined With DB107-Flucytosine (FC) in Patients With Recurrent Glioblastoma or Anaplastic Astrocytoma

Patients will undergo surgery to remove as much of the high-grade glioma (HHG) tumor as possible and will receive combination intravenous (IV) and adaptive repeat intratumoral delivery of DB107-RRV in the vein (IV) and in the walls of the cavity that remains where tumor is removed.

Patients will start taking DB107-FC three times by mouth every day for a period of seven days, which is one cycle of treatment. A cycle of treatment is medication taken on a set schedule with periods of rest in between. Patients will wait five weeks before taking the next seven day course of DB107-FC. The first dose of DB107-FC will be taken at the hospital or clinic; afterward, patients will take the doses of DB107-FC at home. Patients will take DB107-FC for up to 12 months after surgery.