Abstract
The digestive system is an important energy supply system in human body. It can transform the nutrients in food into the energy of human life activities. In special cases, it can convert nutrients into body fat for storage. The appearance of digestive system tumor is a bad disease. It can lead to the loss of tongue coating cells and various complications[1]. According to the experimental theory of medicine, by observing the expression of EGFR in the exfoliated cells of tongue coating and the content of EGF in saliva of patients with tumor of digestive system, we can find the relationship between EGF and the changes of tongue coating cells of patients. Through the way of experiment, we can draw the corresponding conclusion. I think this conclusion will also provide theoretical help for the treatment of cancer-related diseases of digestive system in medicine.
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