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Expression of PD-L1 (SP263) in colorectal cancer. Only membranous staining of tumor cells was evaluated using immunohistochemical staining. (A) TPS 0: <1% of tumor cells; (B) TPS 1: ≥1% to 49% of tumor cells; (C) TPS 2: ≥50% of tumor cells. Magnification: 400×. PD-L1, programmed death ligand-1; TPS, tumor proportion score.
