Atezolizumab and Pre-Surgical Brain Radiation Therapy for Glioblastoma Multiforme

Inclusion Criteria:

* Diagnosis of glioblastoma multiforme WHO Grade IV
* The patient is a surgical candidate, with the surgical intent for a \> 80% resection of the lesion
* Negative pregnancy test
* ECOG status \<= 2
* Tumor volume \<= 3.5 cm
* Adequate organ function
* Negative for infectious disease (human immunodeficiency virus, Hepatitis B Virus, Hepatitis C Virus, tubercolosis)

Exclusion Criteria:

* Patient already underwent surgical total or partial tumor resection, or radiation therapy
* Presence of leptomeningeal disease, gliomatosis cerebri, multifocal disease, bilateral cerebral hemisphere involvement ("butterfly" gliomas)
* Patients at increased risk of neurologic decompensation
* Continued use of high dose intravenous or oral corticosteroids, or \> 8milligrams per day of systemic dexamethasone
* Uncontrolled tumor-related pain
* Uncontrolled pleural effusion, pericardial effusion, or ascites requiring recurrent drainage procedures (once monthly or more frequently)
* Uncontrolled or symptomatic hypercalcemia
* History of autoimmune disease or immune deficiency
* History of idiopathic pulmonary fibrosis, organizing pneumonia (e.g., bronchiolitis obliterans), drug-induced pneumonitis, or idiopathic pneumonitis, or evidence of active pneumonitis
* Significant cardiovascular disease
* History of other malignancy within 1 year prior to screening
* Severe infection within 4 weeks prior to initiation of study treatment
* History of allogeneic stem cell or organ transplant
* Prior treatment with CD137 agonists or immune checkpoint blockade therapies
* Treatment with systemic immunostimulatory agents
* Treatment with systemic immunosuppressive medication