KIF15 and lentivirus infection: On the 5th day after lentivirus infection, the apoptosis rate of shCtrl group and shKIF15 groups was detected by flow cytometry to explore the effects of down-regulation of KIF15 on cell apoptosis of DU 145 and PC-3 cells, showing significantly enhanced cell apoptosis in shKIF15 group (P < 0.01) (Fig. 2C).