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Correlation analysis between PD-1, PD-L1 and PD-L2 expression and the survival time of the lung cancer patients. The expression levels are represented by Allred scores and assessed by Spearman's rank correlation coefficient between the expression level and survival time. PD-1, programmed cell death protein 1; PD-L1/2, programmed cell death protein 1 ligand 1/2.
