RNF13 and nasopharyngeal carcinoma: To explore the function of circRNF13 in NPC, a circRNF13 overexpression vector was constructed, and a circRNF13 siRNA was designed based on the splice site of circRNF13. RT-PCR results showed that circRNF13 overexpression vector or circRNF13 siRNA successfully overexpressed or knocked down circRNF13 in NPC cells and had no effect on linear RNF13 mRNA (Fig. S2).