Angiogenic factors, Platelet-derived growth factor-BB (PDGF-BB), presence of VEGF and Notch signaling pathway, activation of particular steroid hormone receptors, estrogen, progesterone, the family of tyrosine kinases (EGFR, HER1, HER2, HER3, HER4), breast cancer development, endothelial cell migration, proliferation, differentiation, and hematogeneous spread (via the shaped vasculature) are all triggered by angiogenic mediators (Tissue inhibitors of metalloproteinases-1(TIMP-1), Angiopoietin-2(Ang-2))[49–51]. The gene discussed is ERBB2; the disease is breast cancer.