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To delineate genetic factors involved in the pathogenesis of duodenal ulcer, serum pepsinogen I levels were determined by radioimmunoassay in two large kindreds with multiple members affected with duodenal ulcer. An elevated serum immunoreactive pepsinogen I concentration (greater than 100 ng per milliliter) segregated as an autosomal dominant trait in these families. Furthermore, 10 of 11 patients with clinical ulcer disease in these families had hyperpepsinogenemia. An elevated serum pepsinogen I concentration appears to be a subclinical marker of the ulcer diathesis in families with this autosomal dominant form of peptic-ulcer disease.
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