There was a weak correlation between the PD-L1 expression on tumor cells and the infiltration of CD68+ macrophages (r = 0.2957, p = 0.0031, Fig. 2A), and a strong correlation between PD-L1 expression on interstitial cells and the infiltration of CD68+ macrophages (r = 0.8369, p < 0.0001, Fig. 2B). This evidence concerns the gene CD68 and neoplasm.