The representative images of the infiltration of CD163+, CD68+, and CD66b+ cells in GC and adjacent mucosa are shown in Figure 1A. The results showed that the infiltration of CD163+, CD68+, and CD66b+ cells in GC was significantly higher than that in the adjacent mucosa (all P < 0.001) based on 69 cancer–normal paired tissue samples (Fig. 1B). Here, CD68 is linked to cancer.