<qa>  What is a VEGFR TK inhibitor?Melanomas are often vascular, and a decrease in the number of blood vessels that supply the tumor may starve it of needed nutrients. An approach to blocking the growth of blood vessels that supply the tumor is to inhibit the vascular endothelial growth factor receptor tyrosine kinase VEGFR TK signaling pathway. Axitinib AG 013736 is a VEGFR TK inhibitor. 