Next, we found the expression of WTAP and cyclin A2 was positively correlated in RCC tissues which were downloaded from TCGA database (https://cancergenome.nih.gov/) (Additional file 6: Fig. S 6B) (2-tailed Spearman’s correction, R = 0.25, P = 1.3e-12). Here, CCNA2 is linked to renal cell carcinoma.