Abstract From 1959 to 1962, 6859 Japanese clinic subjects had assays of serum peptic activity (referred to as in this study). By 1969 the incidence of stomach cancer was three times higher among men whose pepsin levels had been below 200 μg per milliliter (tyrosine equivalents). A similar trend was not as clear among the women with low pepsins. In 1959, 1251 persons had Diagnex Blue (DB) tests for stomach acidity. There was, over the next 10 years, a significantly higher age-adjusted incidence of stomach cancer among those whose Diagnex Blue tests had been abnormal. A subgroup of 695 persons had both pepsin and Diagnex Blue testing. Those with both low serum pepsin levels and abnormal Diagnex Blue tests comprised only 3.5 per cent of the group but constituted over 30 per cent of the stomach cancers diagnosed. None of these results could be attributed to an effect of atomic-bomb radiation.
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