YWHAH and renal cell carcinoma: In order to explore how circEHD2 regulates the expression of SOX9 through YWHAH and YAP in RCC cells, we used the RNAInter platform (http://www.rna-society.org/rnainter/) to predict the relationship between circEHD2 and the SOX9 promoter, and between YAP and the SOX9 promoter.