IL6 and central nervous system cancer: To determine whether IL-6 is the factor by which gaMSCs induce the increased expression of FOXS1 in glioma cells, U87MG and GBM-1 glioma cells were pretreated with recombinant IL-6 with/without IL-6 neutralizing antibody (5 μg/ml) in DMEM and then the expression of FOXS1 was measured.