What is the definition or description of: islet cell carcinoma?

Pancreatic islets: Islet cell tumors of the pancreas represent the second form of lesion, the first representing lesions of ductal origin that lead to the classic pancreatic carcinoma, most frequently arising in the head. The second group of tumors, those of neuroendocrine origin arise in clustered cells known as islets and which are mainly benign When malignant they spread with a survival of about 5%