Table 1. Gene alterations in primary and recurrent GBM according to their molecular subtypes.

	Primary glioblastoma				Recurrent glioblastoma
	Proneural	Neural	Classical	Mesenchymal	Proneural	Neural	Classical	Mesenchymal
No. of patients	13	7	32	36	5	2	5	10
IDH 1 mutation	10	0	2	0	4	0	1	1
TP53 mutation	5	5	14	20	1	1	4	7
EGFR mutation	4	1	8	10	2	0	1	1
ATRX mutation	2	2	2	3	0	0	1	3