CD34 and central nervous system cancer: Although inhibitor studies using LY294002 and wortmannin predict that PI3K inhibition should result in reduced cell survival, in recent studies PI-103 did not induce apoptosis in normal CD34+ cells or glioma cells [30], [31]; furthermore, treatment of glioma cell lines with PI-103 led to vacuolation and LC-3 processing [32], suggesting that a form of cell death with features of autophagy rather than apoptosis may be induced in some cell types by this inhibitor.