IGF2 and glioblastoma: Recently, it was shown that IGF-2 in CSF from glioblastoma patients has a stimulative effect on neural stem cell proliferation (Lehtinen et al., 2011), and it would be interesting to analyze the IGF-2 levels from the healthy patients' CSF in the future to see if IGF-2 was involved in the changes detected between CSF and NDM cultures.