Gene expression analysis showed significantly lower levels of EGF-R in LN229 and GS090 cells compared to AS (95% lower, p = 0.005 and p = 0.0041 respectively), while NF1 levels were significantly <50% in all GBM cells when compared to AS, except from G166 cells (+47% compared to AS). This evidence concerns the gene NF1 and glioblastoma.