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Representative immunostaining of PD-L1, CD4 and CD8. (A) PD-L1 expression in primary tumour with a CPS score of 10.0; (B) PD-L1 expression in corresponding liver metastasis with a CPS score of 30.0; (C) CD4 TIL in primary tumour with area proportion of 15.0%; (D) CD4 TIL in corresponding pulmonary metastasis with area proportion of 15.0%; (E) CD8 TIL in primary tumour with area proportion of 10.0%; (F) CD8 TIL in corresponding liver metastasis with area proportion of 1.0%.
