Our Pan-NETs cases were diagnosed clinically and resected by our surgeon at the University of Kansas Medical Center, the late Dr Stan Friesen, who screened for serum PP levels after a high-protein meal among the family members of MEN-1 [19,20], yielding a higher percentage of gastrinoma and PPoma cases than the other studies. Here, MEN1 is linked to gastrin-producing neuroendocrine tumor.