FZD7 and intrahepatic cholangiocarcinoma: CircACTN4 promotes intrahepatic cholangiocarcinoma proliferation and metastasis by acting as a sponge for miR-424-5p and by interacting with YBX1 to transcriptionally activate FZD7, which is upregulated in intrahepatic cholangiocarcinoma expression (Chen Q. et al., 2022).