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Correlation analysis between the PD-L1 expression of circulating classical (CM), intermediate (IM) and non-classical monocytes (NCM) and plasma levels of chemokine CXCL11 (ng/ml) of HNSCC patients after radio(chemo) therapeutic treatment. The correlation coefficient (r), spearman (rho) correlation coefficient (rs), and p values are given for each correlation. p < 0.05 was considered as significant. MFI: mean fluorescence intensity
