[Endocrine tumors of the pancreas: classification, clinical and molecular prognostic factors]

Pancreatic endocrine tumors are uncommon. Although the great majority of these tumors are well differentiated, their malignant potential varies sometimes greatly. Thus, a variety of clinicopathologic features have been developed in the past to assist in distinguishing pancreatic endocrine tumors with benign, indeterminate and aggressive behavior. Recently, a revised classification of pancreatic endocrine tumors has been proposed including, in addition to previous parameters, the number of mitoses and a Ki-67 index. In this review, the potential diagnostic utility of these different criteria is discussed.