What are the most common histologic forms of malignant tumors of the pancreas? Almost 90% of pancreatic cancers are moderately well-differentiated adenocarcinomas, derived from the pancreatic ductal epithelium. About 5% of pancreatic cancers originate from the pancreatic islet cells. Other rare types of pancreatic cancer include sarcomas, lymphomas, and cystadenocarcinomas. Define intraductal papillary-mucinous tumors of [...]