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ImmunoCellular Therapeutics Presents Updated ICT-107 Phase 2 Survival and Immune Response Data at the Society for Neuro-Oncology Annual Meeting 2015

LOS ANGELES, Nov. 20, 2015 /PRNewswire/ -- ImmunoCellular Therapeutics, Ltd. ("ImmunoCellular") (NYSE MKT:IMUC) announced the presentation today of recently updated overall survival (OS) results and immune response data from the phase 2 trial of ICT-107 in patients with newly diagnosed glioblastoma. ICT-107 is a dendritic cell-based immunotherapy targeting multiple tumor-associated antigens on glioblastoma stem cells. The data are being presented at the 20th Annual Scientific Meeting and Education Day of the Society for Neuro-Oncology, being held in San Antonio, TX. The data from the phase 2 trial continue to indicate a survival advantage in the ICT-107 treated group compared to the control group. The data also show a significant association between immune response and survival, especially in HLA-A2 positive (HLA-A2+) patients, which is the target patient population for the phase 3 registration trial.

  • OS results were analyzed at three years after the last patient enrolled. For the 124-patient intent-to-treat population (ITT), median OS was 1.6 months or 10% better for ICT-107 patients than control. The difference in the Kaplan-Meier (KM) survival curves for this patient population was not statistically significant.
  • Updated OS results for the pre-specified subgroup of HLA-A2+ patients continue to support selecting this patient population alone for a well powered phase 3 trial. For the MGMT methylated, HLA-A2+ PP population, median OS was 13.8 months or 58% better for ICT-107 treated patients than control. For the MGMT unmethylated, HLA-A2+ per-protocol (PP) population, median OS was 4.0 months or 34% better for ICT-107 treated patients than control. The differences in the KM survival curves for these two pre-specified phase 2 sub-populations were not powered for, and did not achieve, statistical significance.
  • ELISPOT evaluation of antigen-specific immune response demonstrated a more frequent immune response in HLA-A2+ patients compared with HLA-A1 patients, and this difference was statistically significant. This increased immune response in HLA-A2+ patients further supports the selection of HLA-A2+ patients exclusively for inclusion in the phase 3 trial.
  • In HLA-A2+ patients, immune response was shown to be associated with survival. 60% of ICT-107 treated patients demonstrated a statistically significant immune response compared to only 36% of control patients. In a KM comparison of OS for immune responders versus non-responders, the responder curve showed a statistically significant survival benefit with a log-rank p-value of 0.0084. For ICT-107 treated patients, the KM comparison of OS for responders versus non-responders showed a statistically significant survival benefit with a log-rank p-value of 0.0147. The Company believes that the relationship between immune response and OS supports the phase 3 design improvement of adding more ICT-107 doses for patients in the first year of the...