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(a) Gastric primary tumor without IR for PD-L1 in tumor cells but with PD-L1 immunoreactive immune cells in stroma. Insert, magnification. (b) Cancer of unknown primary with PD-L1 immunoreactive immune cells infiltrating tumor environment. (c) Cancer of unknown primary with PD-L1 immunoreactive immune cells in a capsule-like pattern. Scale bars 50 μm.
