RecruitingPhase 2Drug trialDB107-Retroviral Replicating Vector (RRV) Combined With DB107-Flucytosine (FC) in Patients With Recurrent Glioblastoma or Anaplastic AstrocytomaThe purpose of this study is to determine if the investigational products, DB107-RRV and DB107-FC, as a combination treatment will shrink high-grade glioma (HGG) in patients with recurrent/progressive, resectable or unresectable disease and increase the time that disease is controlled.