CXCR4 and cancer: Next, by conducting the online Pan-cancer analysis (http://starbase.sysu.edu.cn/panCancer.php), we found that CXCR4 was significantly upregulated in the cancer tissues collected from patients with kidney renal clear cell carcinoma (KIRC) (Figure 1(h)) and kidney renal papillary cell carcinoma (KIRP) (Figure 1(i)).