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Figure 4: Programmed death-ligand 1 immunostaining for lung adenocarcinoma and squamous cell carcinoma in tissue microarray. Adenocarcinoma cells show membrane staining. High percentage of PD-L1 expression in lung adenocarcinoma (a: ×100; b: ×400). High percentage of PD-L1 expression in lung squamous cell carcinoma (c: ×100; d: ×400)

Figure 4: Programmed death-ligand 1 immunostaining for lung adenocarcinoma and squamous cell carcinoma in tissue microarray. Adenocarcinoma cells show membrane staining. High percentage of PD-L1 expression in lung adenocarcinoma (a: ×100; b: ×400). High percentage of PD-L1 expression in lung squamous cell carcinoma (c: ×100; d: ×400)