Research on glioblastoma has demonstrated a significant increase in IGF-I gene expression in this brain tumor. After suppression of IGF-I expression using anti-gene IGF-I technologies, glioma cells become immunogenic, expressing MHC-I. While injected in vivo, they induce an immune response mediated by T-CD8 lymphocytes. These cells, applied as autologous anti-cancer vaccines have increased the median survival of glioblastoma patients up to 18 months, but often up to two-three years. These differences in clinical results could be explained by variability in vaccine preparation standards.