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K-M 5-year overall survival curves of PD-1/PD-L1 expression in pulmonary metastases. (A) PD-1 expression (n = 67) in the tumour centre (p = 0.114). (B) PD-1 expression (n = 63) in the invasive margin (p = 0.066). (C) PD-L1 expression (n = 67) in the tumour cells (p = 0.024). (D) PD-L1 expression (n = 66) in the tumour infiltrating immune cells (p = 0.943).
