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上海市食管癌移民危险因素的研究表明〔１〕：来自苏北食管癌高发区移民是食管癌的高发人群，这些人群移居上海时间越长，患食管癌的风险越低。因此可推测苏北食管癌高发区环境中可能存在着与生活习惯、生活水平密切相关的食管癌危险因素。江苏淮安市地处苏北里下河地区，人口
Studies on risk factors for esophageal cancer immigration in Shanghai indicate that migrants from high-risk esophageal cancers in northern Jiangsu are high-risk groups of esophageal cancer. The longer these people move to Shanghai, the lower the risk of esophageal cancer. Therefore, it can be speculated that the risk factors for esophageal cancer may be closely related to living habits and living standards in the high incidence area of esophageal cancer in northern Jiangsu. Huai’an City, Jiangsu Province is located in the Lixiahe area of North Jiangsu and has a population of