MKI67 and neoplasm: Patients with detectable CK19 mRNA CTC at baseline (n = 483; 39.6%) had larger tumours (Pearson’s chi-square p = 0.010), more often positive nodal status (Pearson’s chi-square p = 0.028) and higher expression of Ki-67 (Pearson’s chi-square p = 0.001).