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Figure 1: (a) Photomicrograph depicting PD-L1 immunohistochemistry (a) Negative with combined proportion score (CPS) <1 at ×200. (b) Positive immunostaining of both tumor cells and immune cells with combined proportion score; 1 at ×100. (c) Positive immunostaining of only immune cells and CPS; 50 at ×100. (d) Membranous staining of tumor cells ×400

Figure 1: (a) Photomicrograph depicting PD-L1 immunohistochemistry (a) Negative with combined proportion score (CPS) <1 at ×200. (b) Positive immunostaining of both tumor cells and immune cells with combined proportion score; 1 at ×100. (c) Positive immunostaining of only immune cells and CPS; 50 at ×100. (d) Membranous staining of tumor cells ×400