Figure 8. (A) The U251MG cells were treated under different concentrations of ON1231320 and cultured for 24, 48 and 72 h, respectively. (B) Colony formation assay showing the sensitizing effects on GBM cells after apcin treatment. (C) Quantitative results of Colony formation assay (*p < 0.05 vs. the control group, **p < 0.01 vs. the control group).