Gastrojejunal Ulcer, also known as chronic gastrojejunal ulcer without mention of hemorrhage or perforation, without mention of obstruction, is related to zollinger-ellison syndrome and gastric ulcer. An important gene associated with Gastrojejunal Ulcer is CBS (Cystathionine Beta-Synthase). The drugs Narcotics and Gastrins have been mentioned in the context of this disorder. Related phenotype is Reduced mammosphere formation.