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Spatial expression of PD-L1 in primary PDAC and corresponding liver metastases is associated with the presence of tumor-associated macrophages and CD8+ T cells. Representative immunohistochemical stainings for PanCK, PD-L1, CD68, CD163 and CD8 in primary tumors (A) and liver metastases of PDAC patients (B). Scale bar overview pictures (above): 1000 µm, areas within tumor or invasion front (below): 100 µm.
