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. 2021 Jun 21;13:4935–4946. doi: 10.2147/CMAR.S312690

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© 2021 Fu et al.

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Immunohistochemical staining of PD-L1 in ESCC. (A) Score 1: weak; (B) Score 2: relatively weak; (C) Score 3: relatively strong, and (D) Score 4: strong. Scale bar: 100 μm.