CD73 serve as a major immune suppressive mediator in TME mainly through generation of extracellular adenosine. Besides the effect of cancer cell-intrinsic CD73 on tumor cell proliferation, angiogenesis, invasion/migration and metastasis, CD73 expression by tumor cells and immune cells impairs anti-tumor immunity by suppressing the function of protective immune cells (e.g. effector T cells, NK cells, DC and B cells), while maintaining the function of regulatory immune cells (e.g. Treg, MDSC, TAM and CAF).