Abstract: Myeloid derived suppressor cells（MDSCs）are a subpopulation of immunosuppressive innate immune cells derived from bone marrow stem cells, which negatively regulate immune response in tumor progression. MDSCs have a powerful  suppressive function and significant heterogeneity. They can modulate innate and adaptive immune responses through a variety of mechanisms to promote the development of tumor, and also facilitate angiogenesis and metastasis of tumor via non immunologic mechanisms. In recent years, as increasingly mature research for the differentiation, proliferation and suppressive function of MDSCs, the derived  researches of MDSC-targeted tumor immunotherapy will finally contribute to increasing the efficiency of vaccine and tumor therapy in the future.

Key words: Neoplasms, Myeloid cells, Myloied derived suppressor cells, Targeted therapy