“…1A, B, and C), we examined the PTEN protein in cells obtained from 16 GBM patients. Primary human fetal neural stem cells from two embryos were used as controls 17, 24, 37, 46, 53 . Primary cells obtained from nine patients (GBMs 612, 626, 651, 832, 965, 549, 922, 963, and 854) showed undetectable amounts of PTEN proteins.…”