Several recent studies have reported an association between higher Ki-67 proliferative activity and poorer recurrence-free (Goldhirsch et al, 2007; Viale et al, 2008; Jung et al, 2009) and cancer-specific survival (de Azambuja et al, 2007; Al Murri et al, 2008; Yerushalmi et al, 2010). Here, MKI67 is linked to cancer.