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(a) Transbronchial biopsies revealed adenocarcinoma (hematoxylin–eosin staining, scale bar = 50 μm). (b)–(f) Immunostaining of the tumor cells. (b) A carcinoma with high density of CD138‐positive plasma cells in tumor stroma (scale bar = 100 μm). The number of CD4‐positive cells (scale bar = 50 μm) (c) and CD8‐positive cells (scale bar = 50 μm) (d) was enough. PD‐L1 was expressed on 100% of tumor cells (22C3 clones) (scale bar = 100 μm) (e) (scale bar = 50 μm) (f)
