Abstract：The digestive system tumor including esophageal cancer, gastric cancer, colorectal cancer, liver cancer, pancreatic cancer, which have high morbidity and mortality. At present, chemotherapy is one of the treatments for digestive system tumors, but long-term application of chemotherapy drugs often causes drug resistance in tumor cells, which is one of the important challenge in tumor treatment. Exosomes are small vesicles with a diameter of 30-100 nm, which are composed of bilayer membrane. The exosomes contain proteins, nucleic acids, lipids, etc. In recent years, it has been found that exosomes participate in a series of tumor development and development by mediating intercellular communication and regulating tumor microenvironment, especially having an important impact on tumor chemotherapy resistance. This paper mainly summarized the domestic and foreign studies on the involvement of exosomes in the chemotherapy resistance of digestive system tumors, aiming to intuitively expound the mechanism of exosomes mediating the chemotherapy resistance of digestive system tumors, and provide new ideas for the study of tumor resistance.
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2020, Vol. 17 
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