Purpose:To investigate the changes in plasmaendothelin-1(ET-1) level in gastric carcinoma patients before and after chemotherapy and its significance.Methods:Radioimmunoassay was used to detect the level of plasma ET-1 in 25 cases of normal controls and 52 cases of patients with gastric carcinoma before and after chemotherapy. Results:levels of plasma ET-1 were elevated in all subgroups of patients with gastric cancer compared to thecontrols (P