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Baseline PD-L1 TC ≥20% was indicative of high PD-L1 expression. AE adverse event, EGFR epidermal growth factor receptor, H high (PD-L1 TC ≥20%), L low/negative (PD-L1 TC <20%), NE not evaluable (no sample or <100 TCs), PD-L1 programmed cell death ligand-1, PFS progression-free survival, TC tumour cell.
