All cells go through the "cell cycle," which is a series of events that culminate in orderly cell growth and division. In cancer, the cell cycle is out of whack - cells divide without stopping and invade surrounding tissues.
Researchers identified a protein called Tudor-SN that is important in the "preparatory" phase of the cell cycle - the period when the cell gets ready to divide. When scientists eliminated this protein from cells, the cells took longer to divide. Tudor-SN is more abundant in cancer cells than healthy cells, and the study suggests that targeting this protein could inhibit fast-growing cancer cells.