The functioning types secrete hormones such as insulin, gastrin, and glucagon into the bloodstream, often in large quantities, giving rise to serious symptoms such as low blood sugar, but also favoring relatively early detection.
De fungerende former udskiller hormoner såsom insulin, gastrin og glucagon i blodbanen, ofte i store mængder, hvilket fører til alvorlige symptomer såsom lavt blodsukker, men også til relativt tidlig afsløring.