CD4 and gastric cancer: The proportions of 22 kinds of immune cells in the 437 gastric cancer samples are shown in Figure 5A. The correlation matrix between the immune cells showed that the strongest positive correlation was found between neutrophils and activated mast cells, that the strongest negative correlation was found between resting NK cells and activated NK cells, and that negative correlations were found between resting memory CD4+ T cells and CD8+ T cells and between M2 macrophages and naïve B cells (Figure 5B).