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Expression of folate receptor 4 (FR4) and PD-L1 in ESCC patients from this study with immunohistochemistry staining, TIL scores with HE staining. FR4 expression (red) and PD-L1 expression (green) in samples of ESCC (a), TILs in samples of ESCC (b), and difference of PD-L1 scores (c) and TIL scores (d) in subgroups with FR4 expression.
