RASSF1 and pancreatic intraductal papillary-mucinous neoplasm: Typically, the malignant-potential IPMN dissected regions (Fig. 4A) were P16 negative (Fig. 4B), RASSF1 negative (Fig. 4C), and P53 positive (Fig. 4D), whereas the benign IPMN dissected regions (Fig. 4E) were P16 positive (Fig. 4F), RASSF1 positive (Fig. 4G), and P53 negative (Fig. 4H).