Fifty patients with duodenal ulcer disease were examined. In 17 patients (1 group) the constantly recurrent course of the disease was noted, in 33 patients (2 group) the complications (hemorrhage, perforation, stenosing) have occurred in anamnesis. In patients of the first group the acid production rising was concomitant with specific somatostatin-dependent cell reactions domination, in the second one--pentagastrin-dependent.

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