The results from a recruitment assay with co-cultured HUVECs and RCC cells (Fig. 1B) with either AR added or AR knock-down (Fig. 1C) demonstrated that adding AR to RCC 769-P cells (769-P-AR) and 786-O cells (786-O-AR) increased recruitment of HUVECs to RCC cells. This evidence concerns the gene AR and renal cell carcinoma.