What are islet cell tumors of the pancreas?
The following types of neuroendocrine tumors are recognized: • Non-functioning islet cell tumors. Patients with non-functioning tumors do not have any symptoms from excess secretion of pancreatic hormones since the tumor does not secrete any hormones into the blood. • Functional islet cell tumors. These tumors produce dramatic symptoms because of excess secretion of various different hormones from the tumor in the pancreas.