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Figure 1: (a) Positive control for programmed death-ligand 1 staining using normal lymph nodes (×400). Positive cells are stained brown. (b) Positive control for programmed death-1 using normal lymph nodes (×400). Positive cells are stained red. (c) A representative picture of tumor cells of extramammary Paget's disease (H and E, ×100). (d) Result of the programmed death-ligand 1 staining in the same paraffin-embedded specimen of Figure 1c (×100). No tumor cell was stained with the programmed death-ligand 1 antibody. (e) Tumor-infiltrating mononuclear cells were partially positive for programmed death-ligand 1 (×200). (f) Tumor-infiltrating mononuclear cells were partially positive for programmed death-1 (×200)

Figure 1: (a) Positive control for programmed death-ligand 1 staining using normal lymph nodes (×400). Positive cells are stained brown. (b) Positive control for programmed death-1 using normal lymph nodes (×400). Positive cells are stained red. (c) A representative picture of tumor cells of extramammary Paget's disease (H and E, ×100). (d) Result of the programmed death-ligand 1 staining in the same paraffin-embedded specimen of Figure 1c (×100). No tumor cell was stained with the programmed death-ligand 1 antibody. (e) Tumor-infiltrating mononuclear cells were partially positive for programmed death-ligand 1 (×200). (f) Tumor-infiltrating mononuclear cells were partially positive for programmed death-1 (×200)