Natural history of small nonfunctioning pancreatic neuroendocrine tumors.

515 Background: Asymptomatic sporadic nonfunctioning pancreatic neuroendocrine tumors (NF-PNETs) are rare disease but are diagnosed more frequently than before. The aim of this study was to evaluate the natural course of small NF-PNETs. Methods: We performed retrospective study of patients with suspected NF-PNETs from 1999 to 2015. Patients older than 18 years with NF-PNETs diagnosed either by pathology or other clinical evidences were included....