The present invention provides a method for inhibiting cell growth, a nucleic acid molecule useful as an anticancer agent, and a method for screening novel anticancer agents. In the present invention, inhibitory effects on expression of NEKIO variant gene or inhibitory effects on activity of NEKIO variant protein are obtained in cells by transfecting cells with a nucleic acid molecule having an RNA interference effect on NEKIO variant gene. The present invention also provides a method for screening anticancer agents by using this inhibitory effect as an indicator.
