As shown in Figure 5(a), the degrees of infiltration of immune cells such as CD8 T cells (P < 0.001), mast cells (P < 0.001), macrophages (P < 0.001), neutrophils (P < 0.001), plasmacytoid dendritic cells (pDCs) (P < 0.001), and regulatory T cells (Tregs) (P < 0.001) were significantly increased in GC patients with high KYNU expression. Here, CD8A is linked to gastric cancer.