PTEN and glioblastoma: In GBM, EGFR ampl was detected in 105/276, monosomy of chromosome 10/PTEN deletion in 212/276, gain of chromosome 7 in 147/276, TERTp mutations in 237/276; in DA and AA, EGFR ampl was found in 6/37 (4/20 DA and 2/17 AA), gain of chromosome 7 in 27/37 (13/20 DA and 14/17 AA), monosomy of chromosome 10/PTEN deletion in 16/36 (8/19 DA and 8/17 AA), TERTp mutations in 13/37 (7/20 DA and 6/17 AA) cases.