ATIM-13. MULTIMODAL IMMUNOTHERAPY WITH IO-VAC® FOR PATIENTS WITH GBM: A SINGLE INSTITUTION EXPERIENCE

Abstract Multimodal immunotherapy (Newcastle Disease Virus (NDV) + modulated electrohyperthermia + IO-VAC® + immunomodulatory strategies) is an innovative treatment for primary GBM and might prolong overall survival (OS). IO-VAC® consists of DCs loaded with autologous tumor antigens and matured with cytokine cocktail and NDV. We retrospectively reviewed 132 cases of primary GBM. Multimodal immunotherapy was integrated as individualized treatment approach and following different scenario’s in combination with standard treatment in the first line treatment in 71 patients, used at time of first or subsequent relapse as treatment with or without chemotherapy in 61 cases. Median ages were resp. 55 and 53 y. Median KPI at start of immunotherapy was 90 and 80. Median OS for the patients treated with immunotherapy as part of first-line treatment was 20 months with 2-y OS of 40% (CI95%: -13,+13). Median OS for patients treated at time of relapse was 7 months with but still with 18-m OS of 16% (CI95%: -12,+9). Two resp. 1 patients were lost of follow up. A subgroup of 34 GBM patients (10 females) with median age 58y (20–67) was detected, who received NDV + modulated electrohyperthermia during Temozolomide maintenance cycles followed by two IO-VAC® DC vaccinations, and further NDV + modulated electrohyperthermia courses. Median KPI was 70 (60–100). MGMT status was methylated (12), unmethylated (13), unknown (9). Median OS for this subgroup was 23.4 months with 2-year OS of 48% (CI95%: -18,+20). Immunotherapy was feasible without immunotherapy-related side effects of grade III or more. The data suggest that multimodal immunotherapy with IO-VAC® already during and after maintenance chemotherapy, at time of achieved minimal residual disease with local therapy, might help in prolongation of OS. Prolongation of OS in a small group of patients at time of relapse was also demonstrated. IO-VAC® is an approved advanced therapy medicinal product (DE-NW-04-GMP-2015-0030).