CD4 and cancer: In terms of immune cell infiltration (Figure 7(b)), the expression data of immune cells on different software platforms showed that the number of most immune cells infiltrated was positively correlated with risk scores, including cancer-associated fibroblast (EPIC), Macrophage M2 (CIBERSORT_ABS), T Cell Regulatory (Tregs) (QUANTISEQ), Myeloid Dendritic Cell (TIMER), and the like, while the number of some immune cells infiltrated was negatively correlated with the risk scores, such as NK cell (QUANTISEQ) and T cell CD4+ Th1 (XCELL).