The complete linkage hierarchical clustering of both samples and mean-centered MC cell proportions revealed four MCs highly abundant in tumor samples (Figure 2G, green gates); here, two of them were composed of PD-L1+ CD54+ Siglec F+ neutrophils (MC11 and MC17) and the two others contained PD-L1+ CD54+ Siglec F− neutrophils (MC31 and MC13) (Figure 2H), with mean proportions of 16.68 ± 3.06% and 17.41 ± 2.49%, respectively, in tumor samples (Figure 2I). This evidence concerns the gene CD274 and neoplasm.