Hklp2/KIF15, another Ki-67 interacting protein, plays a critical role in the maintenance of spindle bipolarity during cell division and was reported to serve as a breast cancer tumor antigen (Florian and Mayer, 2011; Rath and Kozielski, 2012; Scanlan et al., 2001). The gene discussed is MKI67; the disease is breast carcinoma.