A and B) Crystal violet staining showing the growth of indicated cell lines that were treated with 10 μM or 20 μM of importazole for 24 hours, 48 hours or 72 hours. DMSO was used as vehicle control. C) MTT assay showing relative cell viabilities of PC3 or C42B that was treated with importazole of indicated concentrations for 48 hours. DMSO was used as vehicle control. D and E) Flow cytometry showing the cell cycle stage distribution of indicated cell lines that were treated with 10 μM or 20 μM of importazole for 48 hours. DMSO was used as vehicle control. F) Immunoblotting results showing protein level of Cyclin B1, CDK1, pRCC1 and Cyclin D1 of indicated cell lines that were treated with DMSO, 10 μM or 20 μM of importazole for 48 hours. β-actin was used as internal control. G) Immunoblotting results showing nuclear distribution of c-Myc of indicated cell lines that were treated with 10 μM or 20 μM of importazole for 48 hours. DMSO was used as vehicle control. Lamin A/C was used as loading control of nuclear protein. *p <0.05, **p<0.01, *** p<0.001, ****p<0.0001.