The results showed (Fig. 5B and C) that SDC1 was significantly correlated with fibroblast and mammary epithelial cell senescence (cancer cell Cor = 0.079 p = 0.006; fibroblast Cor = 0.321 p < 0.0001; endothelial cell Cor = 0.159 p < 0.0001; CD8+ T cell Cor = −0.031 p = 0.08; CD4+ T cell Cor = 0.025 p = 0.020; macrophage Cor = 0.190 p < 0.0001; B cell Cor = 0.050 p < 0.0001; epithelial cell Cor = 0.375 p < 0.0001; basal cell Cor = 0.183 p < 0.0001). Here, CD4 is linked to cancer.