High PD-1 expression on regulatory and effector T-cells in lung cancer draining lymph nodes.

Although in the majority of patients the NTDLNs were too small to sample by EBUS-FNA, differences in mean PD-1 fluorescence intensity levels within the CD8 compartment almost reached statistical significance between matched PBMCs, TDLNs and NTDLNs (p=0.05).

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