Also, miR-138-5p was sponged by circ-ZNF609 to regulate FOXP4 expression in RCC, and the circ-ZNF609/miR-138-5p/FOXP4 regulatory network played a role in the pathogenesis of RCC (Xiong et al., 2019). The gene discussed is ZNF609; the disease is renal cell carcinoma.