To further explore the immune cell infiltration in BC, scatter plot was conducted to visualize the association between B cells, CD8 + T cells, CD4 + T cells, Neutrophils, Macrophages, Dendritic cells infiltration, and tumor purity and SKA1/2/3 expression in the TIMER2.0 database (Figure 10(a)). This evidence concerns the gene CD4 and breast cancer.