PRECISE is a Phase III clinical trial of experimental drug IL13-PE38QQR (Study Drug). IL13-PE38QQR is a tumor-targeting agent administered by a continuous infusion directly into the brain around the cavity where the tumor has been removed. Through previous research, this Study Drug has shown potential to control some of the recurrent malignant gliomas, such as glioblastoma multiforme (GBM), anaplastic astrocytoma, and malignant mixed oligoastrocytoma.