In this phase 3 nonrandomized controlled trial of 331 patients, patients with newly diagnosed glioblastoma (nGBM) receiving autologous tumor lysate-loaded dendritic cell vaccination (DCVax-L) had a median OS of 19.3 months from randomization (22.4 months from surgery), while contemporaneous, matched external control patients receiving SOC had a median OS of 16.5 months from randomization; for patients with recurrent glioblastoma (rGBM), the median OS was 13.2 months from relapse in the DCVax-L group vs. 7.8 months in the external control cohort. Both in nGBM and rGBM, significant increases in the long-term tails of the survival curves were seen.