To explore the interaction network of core genes at the protein level, the PPI network was constructed using the STRING database and visualized using Cytoscape 3.7.1 (Figure 7F) Ten core genes were obtained by screening based on BC values: VCL, DUSP1, FLNA, THBS1, TAGLN, ACTA2, COL6A2, VWF, CXCR4, and CALD1. The gene discussed is CXCR4; the disease is breast cancer.