Figure 1

Correlation of PD-L1 expression with TIL surface markers. Median value of TILs with expression of CD8 (a), CD4 (b), Foxp3 (c), and PD-1 (d) was calculated from counting on three different fields of immunohistochemical staining, and classified into two groups (positive and negative) based on each cutoff value. The cutoff value was set at 20 for CD8, 1 for CD4, 1 for Foxp3, and 1 for PD-1. IQR, interquartile range