In cluster C1, TIMER analysis showed that gastric cancer patients had significantly lower B cell (p = 8.7 × 104), CD4 T cell (p = 3.2 × 107), CD8 T cell (p = 4.1 × 103), neutrophil cell (p = 2.6 × 107), macrophage (p = 1.0 × 1020), and dendritic cell (p = 3.2 × 109) compared with cluster C2 and cluster C3 (Figure 3B). This evidence concerns the gene CD8A and gastric cancer.