[Blood serotonin in stomach cancer]

The results of examination of serotonin content in blood of 35 patients with different stages of gastric cancer are reported. Patients with cancer of the stomach show a decreased blood serotonin level compared with analogous data, obtained in healthy individuals and in patients with ulcerous disease of the stomach and duodenum. Contrary to patients with ulcerous disease in patients with gastric cancer hyperserotoninemia would not be restored postoperatively.