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. 2021 Oct 20;14:5403–5417. doi: 10.2147/JIR.S331010

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© 2021 Zhang et al.

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Immunohistochemical expression of XRCC1, CD4, FOXP3, PD-1, and PD-L1 in clinical samples of HPs, LGDs, HGDs, and CRCs (all images: original magnification, ×200). (A–D) PD-1 epithelial expression in infiltrating lymphocytes. (E–H) PD-L1 epithelial expression in infiltrating lymphocytes. (I–L) CD4-positive intraepithelial lymphocyte density. (M–P) FOXP3-positive intraepithelial lymphocyte density. (Q–T) XRCC1 nuclei expression in colonic epithelial cells and tumor cells.