VEGFA and renal cell carcinoma: Total VEGF and VEGFXXX/NF mRNA were amplified by RT‐PCR (Fig. S2D) and RT‐qPCR (Fig. 1B) from human tissues and RCC cell lines (Fig. 1C and Fig. S2E) and the amplicons obtained with RNA from endothelial cells (TIME) served as reference values.