TFCP2L1 and hepatocellular carcinoma: Until now, researchers have discovered several novel circRNAs working as a miR-7 sponge, such as circ_0000735 in prostate cancer [68], circ-ITCH in osteosarcoma [69], circ-TFCP2L1 in breast cancer [70], and circ_0015756 in hepatocellular carcinoma (HCC) [71].