CD8A and gastric cancer: This confirmed the significantly higher number of CD8+ T cells (P = 0.006), cytotoxic lymphocytes (P = 1.9e-05), monocytic lineage (P = 0.004), T cell (P = 0.0099), and NK cell (P = 0.0065) infiltrations in cluster 2 gastric cancer, along with the higher endothelial cell (P = 0.026) and fibroblast (P = 0.0033) infiltrations in cluster 1 (Figures 2A–C; Supplementary Figure S1A).