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Representation of major factors involved in chemoresistance. ABC, ATP-binding cassette; APC, antigen-presenting cell; CTL, cytotoxic T lymphocytes; DCs, Dendritic cells; MDR, multidrug resistance; MHC, major histocompatibility complex; NKs, natural killer cells; P-gp, P-glycoproyein; PD1/PD-L1, programmed cell death-1/programmed cell death-ligand 1; TH, T helper; Treg, T regulatory.
