Abstract: Exosomes are secreted by living cells, which have the lipid bilayer and a large number of inclusions. We have found that exosomes derived from tumor cells play a crucial role in the development of tumor. Tumor-derived exosomes not only act as the messenger between tumor cells, but also perform as a carrier that affects the normal cells far away. Moreover, it has been reported to play positive role in the proliferation, differentiation, metastasis and immune resistance of tumor cells.

Key words: exosomes, tumor cell, metastasis, immune escape