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Overall survival curve after surgery following concurrent chemo-radiotherapy according to programmed death ligand-1 (PD-L1) expression on tumour cells or density of stromal CD8-positive tumour-infiltrating lymphocytes. PD-L1 programmed death ligand-1, TPS tumour proportion score, cCRT concurrent chemo-radiotherapy, CD8 + TIL CD8-positive tumour-infiltrating lymphocyte
