Figure 3.

 Receiver operating characteristics curve showing prognostic true and false positivity rates of the Ki-67 indices. The predictive properties (%) are calculated on the basis of three year survival of the 34 patients divided into six subgroups of approximately equal size. The patient groups are placed in the curve according to decreasing proliferation: patients with the highest tumour proliferation are at the bottom left corner of the curve, and patients with the lowest tumour proliferation are at the top right corner of the curve. The most efficient cutoff point of each Ki-67 index is shown.