Relying on the TIMER 2.0 database, we found that CCNB2 was overexpressed in most tumor tissues, such as bladder cancer (BLCA), breast cancer (BRCA), cervical cancer (CESC), esophageal cancer (ESCA), prostate cancer (PRAD) (p < 0.05), and clear cell renal cell carcinoma (ccRCC) (p < 0.001) (Fig. 2A). This evidence concerns the gene CCNB2 and clear cell renal carcinoma.