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RFVs for PD-L1+ and PD-1+ exosomes/mL plasma and levels of sPD-L1 in plasma of HNSCC patients. A. No correlation between RFVs for PD-L1+ and PD-1+ exosomes in plasma of HNSCC patients was observed: Spearman’s correlation at p=0.7, r=0.05. B. No correlation between RFVs for PD-L1+ exosomes in patients’ plasma and soluble PD-L1; Spearman’s correlation at p=0.85, r=0.03.
