Since Zollinger and Ellison described in 1955 a pathological entity consisting of multiple recurrent peptic ulcerations, gastric hypersecretion, and islet cell tumours of the pancreas, several reports have been published dealing with the clinical and biological aspects of this new syndrome (Priest and Alexander, 1957;Summerskill, 1959; Gregory,Tracy, French, and Sircus, 1960; Grossman, Tracy, a...