Reporting precursors to invasive pancreatic cancer: Pancreatic intraepithelial neoplasia, intraductal neoplasms and mucinous cystic neoplasm

Invasive ductal adenocarcinoma of the pancreas remains an almost universally lethal disease. Despite strenuous research efforts, the prognosis of the disease has not improved in the past decades. However, knowledge of pancreatic tumorigenesis and the identification and characterization of the precursor lesions that give rise to invasive pancreatic cancer have dramatically improved. This, coupled with the finding that it takes almost two decades for a pancreatic cell with an initial mutation to develop into a metastatic pancreatic cancer provides hope for the early detection of curable pancreatic neoplasms. We present a review of established precursor lesions of pancreatic cancer, including pancreatic intraepithelial neoplasia, intraductal papillary mucinous neoplasms (including intraductal oncocytic papillary neoplasm and intraductal tubulopapillary neoplasm), and mucinous cystic neoplasm.