Animals, Brain Neoplasms, Caspase 3, Caspase 9, Caspase Inhibitors, Cell Division, Cell Membrane, Cell Survival, Enzyme Inhibitors, Glioma, Humans, Injections, Intralesional, Mice, Mice, SCID, Neoplasm Transplantation, Oligopeptides, Peptides, Cyclic, Receptors, Vitronectin, Spheroids, Cellular, Tumor Cells, Cultured