CXCR4 and glioblastoma: In the present study, we started from the observation that radiation increased KCa3.1 function, and evaluated the expression of key genes related to cell invasion and/or reported to be increased after radiation in GBM, such as CXCL12 [12,31], CXCR4 [32], EGFR [33,34], and metalloproteinases [35,36].