In addition, we observed that the level of CXCL9 expression was positively associated with the infiltration levels in BC: B cells (Figure 5B, r=0.519, P<0.01), CD8+ T cells (Figure 5C, r=0.543, P<0.01), CD4+ T cells (Figure 5D, r=0.518, P<0.01), neutrophils (Figure 5E, r=0.543, P<0.01) and dendritic cells (Figure 5F, r=0.617, P<0.01), which were consistent with the results of the subtype analysis (Supplementary Figure S3). This evidence concerns the gene CD4 and breast cancer.