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BACKGROUND Addition of temozolomide (TMZ) to radiotherapy (RT) improves overall survival (OS) in glioblastoma, but previous studies suggest that patients with tumors harboring an unmethylated MGMT promoter derive minimal benefit. The aim of this open-label, phase 3 CheckMate 498 study was to evaluate the efficacy of nivolumab (NIVO)+RT compared with TMZ+RT in newly diagnosed glioblastoma with unmethylated MGMT promoter. METHODS Patients were randomized 1:1 to standard RT (60 Gy) + NIVO (240 mg every 2 weeks for 8 cycles, then 480 mg every 4 weeks) or RT+TMZ (75 mg/m 2 daily during RT and 150-200 mg/m 2/day 5/28 days during maintenance). The primary endpoint was OS. RESULTS A total of 560 patients were randomized, 280 to each arm. Median OS was 13.4 months (95% CI, 12.6-14.3) with NIVO+RT and 14.9 months (95% CI, 13.3-16.1) with TMZ+RT (hazard ratio [HR], 1.31; 95% CI, 1.09-1.58; P=0.0037). Median progression-free survival was 6.0 months (95% CI, 5.7-6.2) with NIVO+RT and 6.2 months (95% CI, 5.9-6.7) with TMZ+RT (HR, 1.38; 95% CI, 1.15-1.65). Response rates were 7.8% (9/116) with NIVO+RT and 7.2% (8/111) with TMZ+RT; grade 3/4 treatment-related adverse event (TRAE) rates were 21.9% and 25.1%, and any-grade serious TRAE rates were 17.3% and 7.6%, respectively. CONCLUSIONS The study did not meet the primary endpoint of improved OS; TMZ+RT demonstrated a longer median OS than NIVO+RT. No new safety signals were detected with NIVO in this study. The difference between the study treatment arms is consistent with the use of TMZ+RT as standard of care for glioblastoma.

neuro-oncology

Radiotherapy combined with nivolumab or temozolomide for newly diagnosed glioblastoma with unmethylated <i>MGMT</i> promoter: An international randomized phase III trial

Radiotherapy combined with nivolumab or temozolomide for newly diagnosed glioblastoma with unmethylated MGMT promoter: An international randomized phase III trial