ITCH and cancer: MiRNAs sponge locations of circ-ITCH downstream in malignant tumors now being researched, including miR-7, miR-10, miR-17, miR-20, miR-22, miR-93, miR-106, miR-145, miR-199, miR-214, miR-216, miR-224, miR-421, miR-524, and miR-615 (Huang et al., 2015; Li et al., 2015; Luo et al., 2018b; Hu et al., 2018; Wang et al., 2018; Yang et al., 2018; Lin et al., 2020; Liu et al., 2020; Wang et al., 2021).