AXL and cancer: Among these proteins, AXL receptor tyrosine kinase (AXL), carbonic anhydrase IX (CA9), enolase 2 (ENO2), human epidermal growth factor receptor (HER) 1, HER2, HER3, progranulin (PRGN), and platelet-derived growth factor-AA (PDGF-AA) are primarily involved in cancer cell proliferation [58,59,60,61,62,63,64,65].