GAST（gastrin），癌症关联基因，基因ID：2520，胃泌素是一种激素，其主要功能是刺激胃粘膜分泌盐酸，从而抑制胃泌素的形成这种激素也是胃肠道上皮细胞有丝分裂因子胃泌素有两种生物活性肽形式，G34和G17[由RefSeq提供，2008年7月]Gastrin is a hormone whose main function is to stimulate secretion of hydrochloric acid by the gastric mucosa， which results in gastrin formation inhibition. This hormone also acts as a mitogenic factor for gastrointestinal epithelial cells. Gastrin has two biologically active peptide forms， G34 and G17. [provided by RefSeq， Jul 2008]。