The pancreas was a glandular organ in the digestive and endocrine system of vertebrates. A pancreatic scan could determine the health of the pancreas. (VOY: "Ex Post Facto")
In 2372, Vidiians invading the USS Voyager found that Human pancreatic tissues were well suited for transplant and prepared to harvest them. (VOY: "Deadlock")
In the first draft script of VOY: "Flashback", it was established that Vulcan coffee would paralyze a Human's nervous system and atrophy his or her pancreas. Despite the risks, Tuvok offered to make Janeway some of it, if she wanted him to. However, these lines were omitted by the time the final draft of the installment's teleplay was issued.