KDR and cancer: These include mainlyproteins overexpressed or expressed exclusively in cancer cells, i.e.,human epidermal growth factor receptor 2 (HER2), vascular endothelialgrowth factor receptor (VEGFR), or Bcr-Abl fusion protein.11 One of the cancer-related proteins is also fibroblastgrowth factors (FGFs) and their receptors (FGFRs).