All are true about Neuroendocrine tumor of pancreas except:

“Insulinomas are the most common pancreatic endocrine neoplasms and present with a typical clinical syndrome known as Whipple’s triad" - Schwartz Gastrinoma (Zollinger-Ellison Syndrome); The most common presenting symptoms are an abdominal pain (70-100%), diarrhea (37-73%). and gastroesophageal reflux disease (GERD) (30- 35%); 10-20% have diarrhea only"-Harrison Table: GI Neuroendocrine Tumor Syndrome