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Colocalization of PD-1 and PD-L1 expression with T-cell infiltrates in iLTS. Immunostaining of a representative iLTS patient sample showing (A) subepithelial lymphocytic infiltrate on H&E, which is associated with (B) PD-1, (C) PD-L1, (D) CD4, and (E) CD8 staining. All specimens imaged at 100× magnification. H&E = hematoxylin and eosin; iLTS = iatrogenic laryngotracheal stenosis; PD-1 = programmed death-1; PD-L1 = programmed death-ligand 1.
