Fig. 1From: Basal cell carcinoma: PD-L1/PD-1 checkpoint expression and tumor regression after PD-1 blockadeGeographic co-localization of PD-L1+ tumor cells and associated immune cells with PD-1+ infiltrating immune cells in BCC. PD-1, programmed death-1; PD-L1, programmed death ligand-1. 200× original magnification, all panelsBack to article page