Fig. 1From: PD-L1-specific helper T-cells exhibit effective antitumor responses: new strategy of cancer immunotherapy targeting PD-L1 in head and neck squamous cell carcinomaExpression levels of PD-L1 and HLA-DR in oropharynx squamous cell carcinoma tissue. Tissue specimens of patient with oropharynx squamous cell carcinoma were classified into four groups by immunostaining intensity for PD-L1 or HLA-DR: a, e negative staining; b, f weak staining; c, g moderate staining; d, h strong staining. H&E staining was shown in the right. Representative images are shown. Scale bar is 100 μmBack to article page