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Figure 2: Programmed death-ligand 1 immunostaining for lung squamous cell carcinoma in matched cytologic cell block and surgical samples. Squamous cell carcinoma cells show membrane staining. High percentage of PD-L1 expression in lung squamous cell carcinoma in cell block (a: ×100; b: ×400). High percentage of PD-L1 expression in lung squamous cell carcinoma in matched surgical biopsy specimen (a: ×100; b: ×400; c: ×100; d: ×400)

Figure 2: Programmed death-ligand 1 immunostaining for lung squamous cell carcinoma in matched cytologic cell block and surgical samples. Squamous cell carcinoma cells show membrane staining. High percentage of PD-L1 expression in lung squamous cell carcinoma in cell block (a: ×100; b: ×400). High percentage of PD-L1 expression in lung squamous cell carcinoma in matched surgical biopsy specimen (a: ×100; b: ×400; c: ×100; d: ×400)