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根据不同地貌、地质条件在３０个县市按剖面、同步、随机取土壤样品以及在消化系癌高、低发县取稻谷样品测定锌含量，作相关和对比分析显示：土壤、稻谷锌含量与消化系癌呈负相关关系；在缺锌Ｗｉｓｔｅｒ大鼠模型中，用ＭＮＮＧ作致癌剂，致消化系癌的实验研究，其结果与相关和对比分析相一致，进一步揭示出微量元素锌与消化系癌的密切关系。
According to different geomorphological and geological conditions, the zinc content was determined by taking profiles of soil samples in 30 counties and cities, taking soil samples synchronously and randomly, and taking rice samples from digestive system cancer high and low hair counties. Correlation and comparative analysis showed that the soil and the zinc content of rice were Gastrointestinal cancer was negatively correlated. In the zinc deficiency Wister rat model, MNNG was used as a carcinogen to induce gastrointestinal cancer. The results were consistent with the correlation and comparative analysis, further revealing trace elements zinc and the digestive system. The close relationship between cancer.