Figure 1.
Histopathological features of representative pancreatic proliferative lesions, including (A) pancreatic intraepithelial neoplasia (PanIN) 1 (mild hyperplastic lesions), (B) PanIN2 (papillary hyperplasia), (C) PanIN3 (carcinoma in situ) and (D) invasive ductal adenocarcinoma (hematoxylin and eosin staining; scale bar, 100 µm).