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Concordant PD-L1 reactivity in paired histological and cytological specimens from a lung squamous cell carcinoma (original magnification ×400). (A) Bronchial biopsy, H&E staining, >500–1000 cells. (B) Bronchial biopsy, PD-L1 immunostaining, ≥50% positive malignant cells. (C) Bronchoalveolar lavage, H&E staining, >300–500 cells. (D) Bronchoalveolar lavage, PD-L1 immunostaining, ≥ 50% positive malignant cells.
