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

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