EF-41/KEYNOTE D58: Phase 3 Study of Optune Concomitant With Temozolomide Plus Pembrolizumab in Newly Diagnosed Glioblastoma

Prior treatment

• Ongoing requirement for \>2 mg dexamethasone (or equivalent), due to intracranial mass effect.
• Has received prior systemic anti-cancer therapy including investigational agents within 4 weeks prior to randomization.
• Received a live or live-attenuated vaccine within 30 days before the first dose of study intervention. Administration of killed vaccines are allowed.
• Is currently participating in or has participated in a study of an investigational agent or has used an investigational device within 4 weeks prior to the first study treatment.
• Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 7 days prior the first dose of study medication. Has a known additional malignancy that is progressing or has required active treatment within the past 3 years.

Other illness

• Has a history of (noninfectious) pneumonitis/interstitial lung disease that required steroids or has current pneumonitis/interstitial lung disease.
• Early progressive disease after the end of TMZ/RT. If pseudo progression is suspected, additional imaging studies should be performed to rule out true progression.
• Infratentorial or leptomeningeal disease.

Lab values

• Has received prior therapy with an anti-Programmed Cell Death 1 (PD-1), anti- Programmed Cell Death-Ligand 1(PD-L1), or anti Programmed Cell Death-Ligand 2 (PD-L2) agent or with an agent directed to another stimulatory or co-inhibitory T-cell receptor (e.g.Cytotoxic T-Lymphocyte-Associated protein 4 (CTLA-4), OX 40, CD137).

• The participant (or legally acceptable representative) has provided documented informed consent for the study.
• Be ≥ 18 years of age on day of providing informed consent.
• Participant with new diagnosis of GBM according to World Health Organization (WHO) 2021 Classification.
• Recovered from maximal debulking surgery (gross total resection, partial resection and biopsy-only patients are all acceptable), Gliadel wafers placement at the time of surgical resection is not allowed.
• Have completed standard adjuvant chemoradiotherapy of radiotherapy (RT) according to local practice (56-64 Gy), and concomitant TMZ chemotherapy.
• Amenable to treatment with Optune concomitant with maintenance TMZ (150-200 mg/m\^2 daily x 5, Q28 days).
• Have an Eastern Cooperative Oncology Group (ECOG) Performance Status of 0 to 1 assessed within 7 days before randomization.
• Stable or decreasing dose of corticosteroids (dexamethasone ≤ 2mg or equivalent) for the last 7 days prior to randomization, if applicable.