A primary malignant neoplasm of the pancreatic ISLET CELLS. Usually it involves the non-INSULIN-producing cell types, the PANCREATIC ALPHA CELLS and the pancreatic delta cells (SOMATOSTATIN-SECRETING CELLS) in GLUCAGONOMA and SOMATOSTATINOMA, respectively.

Synonyms: Islet Cell Carcinomas, Carcinoma, Islet Cell, Islet Cell Carcinoma, Carcinomas, Islet Cell, Islet Cell Tumor, Malignant