Abstract
The effects of somatostatin on tolbutamide-stimulated insulin release were studied in 4 patients with insulin-producing tumors of the pancreas and in 6 normal subjects. In contrast to its effective inhibition of insulin release in normal subjects, somatostatin, without exception, failed to inhibit tolbutamide-induced insulin release in the patients with pancreatic beta-cell tumors. This differential effect of somatostatin may prove useful in the diagnosis of insulin-producing tumors of the pancreas.
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