CD8A and neoplasm: Besides, the high‐risk group generally had lower infiltration levels of immune cells, especially CD8+ T cells, neutrophils, natural killer (NK) cells, T helper (Th) cells (Tfh, Th1, and Th2 cells), regulatory T (Treg) cells and tumour‐infiltrating lymphocytes (TILs) (p < 0.05) (Figure 7A).