OIP5 and cancer: The role of lncRNAs OIP5-AS1 (M2), SBF2-AS1 (M2), MIAT (M7), MEG3 (M7), SNHG5 (M8), LINC00511 (M8), SNHG6 (M9) as miRNA sponges are well-studied in cancer (Wang D. et al., 2020, Wang H. S. et al., 2020; Lu et al., 2021; Zhang S. et al., 2021).