An Investigational Immuno-therapy Study of Nivolumab Compared to Temozolomide, Each Given With Radiation Therapy, for Newly-diagnosed Patients With Glioblastoma (GBM, a Malignant Brain Cancer)

Inclusion Criteria:

• Males and Females, age ≥ 18 years old
• Newly-diagnosed brain cancer or tumor called glioblastoma or GBM
• Tumor test result shows MGMT unmethylated type
• Karnofsky performance status of ≥ 70 (able to care for self)

Exclusion Criteria:

• Prior treatment for GBM (other than surgical resection)
• Any known tumor outside of the brain
• Recurrent or secondary GBM
• Active known or suspected autoimmune disease
• Biopsy with less than 20% of tumor removed Other protocol-defined inclusion/exclusion criteria apply