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Multiplex immunohistochemistry images of PD-L1 expression on cancer cells among (A) lung cancer and (B) brain metastasis specimens. (C) Relationship of PD-L1 among (A) and (B). Correlation plots of PD-L1 expression on cancer cells between lung cancer and brain metastasis across all samples. Scores were significantly correlated (p = 0.0018). PD-L1, programmed death-ligand 1.
