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流行病学研究提示，食管瘤的发病可能是以环境因素为主，与饮食生活习惯有关，其中亚硝胺病因学说已被广泛接受为食管癌可能的重要病因之一。我们于１９９５年３～４月和１９９６年３月对食管癌高发区林州市（原林县）和低发区禹州市进行了膳食营养和饮用水调查，为验证食管癌?
Epidemiological studies suggest that the pathogenesis of esophageal neoplasm may be based on environmental factors, and is related to dietary habits. The etiology of nitrosamines has been widely accepted as one of the most important causes of esophageal cancer. We conducted dietary nutrition and drinking water surveys in Linzhou (formerly Linxian) and low-incidence districts in high-incidence areas of esophageal cancer from March to April 1995 and March 1996 to verify esophageal cancer.