Sporadic, non-functional, gastrin-producing duodenal neuroendocrine tumors: A retrospective study of an infrequent disease.

Objectives: Non-functioning gastrin-producing neuroendocrine neoplasms (NEN) of the duodenum are rare gastrointestinal tumors without a clinical syndrome due to gastrin production. Their incidence has significantly increased as an incidental finding during endoscopic studies. The aim of this study was to describe the characteristics and prognostic factors of this emergent and infrequent neoplasm.