论文部分内容阅读
一、病因学:对食管癌高发区和低发区粮食及饮水中亚硝胺物质测定的结果表明:食管癌高发区粮食中亚硝胺检出率明显地高于低发区,如高发区林县124个样品,检出率为23.3%,低发区范县86个样品,检出率为1.2%,高发区洛宁县为33.3%(12/36),而低发区禹县为0%(0/36)。高发区井水中硝酸盐含量均高于低发区,水中含硝酸盐、亚硝酸盐含量高的地区食管癌死亡率亦高,故认为饮水中含有高浓度的硝酸盐,是食管癌致病因素之一。
I. Etiology: The results of the determination of nitrosamines in food and drinking water in high- and low-incidence areas of esophageal cancer showed that the detection rate of nitrosamines in foods in high-incidence areas of esophageal cancer was significantly higher than in low-prevalence areas, such as high-risk areas. 124 samples from Linxian County had a detection rate of 23.3%, 86 samples from Fanxian County with a low incidence rate of 1.2%, Luoning County with a high incidence of 33.3% (12/36), and low-prone areas with a probability of 0 %(0/36). Nitrate levels in well waters in high-incidence areas are all higher than those in low-incidence areas. Elevations in esophageal cancer are also high in areas with high levels of nitrates and nitrites. Therefore, drinking water contains high concentrations of nitrates and is a pathogenic factor of esophageal cancer. one.