As well the anti-apoptotic function of CK2 allows the cancerous cell to escapes cell death and continue proliferating. Having roles in cell cycle regulation may also indicate CK2's role in allowing cell cycle progression when normally it should have been ceased.
The anti-apoptotic properties of CK2 allow cancer cells to survive and proliferate, even when they should die.  Its participation in regulating the cell cycle could explain how CK2 enables continued cell division despite normal termination signals.