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. 2021 Feb 12;70(9):2617–2624. doi: 10.1007/s00262-021-02876-w

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© The Author(s) 2021

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Fig. 2 — Photomicrographs of immunohistochemical staining with monoclonal anti-PD-L1 antibody (clone 22C3; Dako). a > 50% positive membranous staining of tumor cells. Scale bar 50 μm. b Negative staining. Scale bar 100 μm