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CCL22 is a macrophage-derived immunosuppressive chemokine that recruits regulatory T cells through the CCL22:CCR4 axis. It was shown to play a key role in suppressing anti-cancer immune responses in different cancer types. The chemokine CCL22, predominately produced by dendritic cells （DCs）, regulates T reg migration via binding to its receptor CCR4. CCL22 controls T cell immunity, both by recruiting T regs to the tumor tissue and by promoting the formation of DC-T reg contacts in the lymph node. There was article showed that tumor-associated macrophages （TAMs） produced an abundance of C-C motif chemokine 22 （CCL22）, whose expression in the tumor stroma was positively associated with the level of intratumoral phospho-focal adhesion kinase （pFAK Tyr397）, tumor metastasis and reduced patient survival.