<prompt> Which is the least malignant pancreatic endocrine tumor ?Zollinger-Ellison syndromeInsulinomaVIPomaGlucagonoma  <response>: Insulinoma patients generally presents with hypoglycemia symptoms. Mainly located in the pancreas, and malignancy is 10. Reference: Table 350-2, Harrisons Principles of Internal Medicine, 18th Edition, Page 3057 