1.   Fasting serum gastrin was measured by a GASK-PR radioimmunoassay kit from Oris Company, France.

2.   Antral gastrin and somatostatin cell densities and fasting serum gastrin concentrations were similar in the two groups of patients with Zollinger-Ellison sydrome.

3.   Comparing the two groups of patients with Zollinger-Ellison sydrome, there was no difference in gastrin and somatostatin cell densities or in the fasting serum gastrin concentration.