An Investigational Immuno-therapy Study of Temozolomide Plus Radiation Therapy With Nivolumab or Placebo, for Newly Diagnosed Patients With Glioblastoma (GBM, a Malignant Brain Cancer)

Progression-free Survival (PFS) Determined by BICR

The time from randomization to the date of the first documented tumor progression or death by any cause. PFS will be determined by a Blinded Independent Central Review (BICR) assessed based on Radiologic Assessment in Neuro-Oncology (RANO) criteria. Specifically, RANO response criteria indicates that within the first 12 weeks of completion of radiotherapy, progression can only be assessed if the majority of the new enhancement is outside of the radiation field or if there is pathologic confirmation of progressive disease.

Time frame: From randomization to the date of the first documented tumor progression or death by any cause. (up to approximately 4.5 years)

Overall Survival (OS)

The time from the date of randomization to the date of death. who have not died by the end of the study will be censored to last known date alive. OS is assessed in the randomized population with no corticosteroids at baseline population and in the overall randomized population.

Time frame: From randomization to date of death (up to approximately 4.5 years)