There is no correlation for any of the studied genes for the meningiomas group, while there is positive correlation for AOX1 (F(1,10) = 10.07, p = 0.011), GSTM3 (F(1,10) = 7.9, p = 0.02) and GSTP1 (F(1,10) = 6.6, p = 0.03) in the astrocytomas group. This evidence concerns the gene GSTM3 and astrocytoma (excluding glioblastoma).