ATP1B3 and undifferentiated carcinoma: Gene concept network analysis of the DEGs abstracted from the above two endothelial cell subpopulations revealed that in TNBC, EC (ATP1B3) could contribute to TNBC metastasis to fibrosarcoma, hereditary diffuse gastric cancer, and anaplastic carcinoma (Figure 4(a)), while EC (HSPA1B) could participate in TMBC metastasis of fibrosarcoma and anaplastic carcinoma (Figure 4(b)).