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Comparison of median GMFI values of programmed death ligand 1 (PD-L1). Median GMFI values for PD-L1 were compared among each sample category and plotted as (A) pie chart and (B) bar graphs representing median and standard deviation. p values were calculated using the Mann–Whitney test.* p≤0.05, ** p≤0.01. Color images available online at www.liebertpub.com/aid
