They found that patients with immune subtype 3 with a high infiltration of CD8+ and CD4+-activated T cells, NK cells, and M1 macrophages had the best prognosis, while the patients with immune subtype 1 with a high infiltration B cells, dendritic cells, and CD4+ resting T cells had the worst prognosis of gastric cancer. The gene discussed is CD8A; the disease is gastric cancer.