INS and pancreatic neuroendocrine tumor: The aim of this study was to investigate the contribution of miR-204 to the regulation of the insulin gene transcript; we analyzed miR-204 and insulin expression in pancreatic endocrine tumors (PET), induced pluripotent stem cells (iPSCs) in the course of their differentiation towards an insulin producing endocrine phenotype, human islets, and in the human EndoC-βH111 cell line, as a model of pancreatic β cells.