(A and B) MTS assay results showing the inhibitory effects of FTY720 on the proliferation of MUG-Chor1 and U-CH1 cells at concentrations of 0, 5, 10, 15, 20 and 30 μM. (C and D) MTS assay results showing the inhibitory effects of FTY720 on the proliferation of MUG-Chor1 and U-CH1 cells with different treatment time periods ranging from 24 to 120 h. (E) Colony-formation assay results showing that the proliferation capacity of MUG-Chor1 and U-CH1 cells was inhibited under FTY720 treatment; scale bar = 20 μm. (F) EdU assay results showing the inhibitory effects of FTY720 on the proliferation of MUG-Chor1 and U-CH1 cells; scale bar = 100 μm. All data are shown as the mean ± S.D. (three independent experiments); **P < 0.01; ***P < 0.001; scale bar = 50 μm.