FIGURE 2

Ki-67–labeling indices in normal duct/PanIN-1A and infiltrating ductal adenocarcinoma. The panel on the left shows a comparison of labeling between infiltrating adenocarcinoma (AdCA, high labeling) and normal duct/PanIN-1A (low labeling). The panel on the right contains a high-power view of infiltrating adenocarcinoma, in which approximately one third of the nuclei stain.