Gastrin is a hormone that regulates the amount of gastric acid secreted in the stomach for normal digestion. The cells that release gastrin can release too much of this hormone resulting in severe and recurring episodes of peptic ulcers. High gastrin levels may be seen in people with certain pancreatic cancers, where the pancreatic cells produce gastrin (Zollinger-Ellison syndrome). High gastrin levels may also be due to stomach cancer, chronic renal failure, or pernicious anemia.
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