OIP5 and osteosarcoma: Opa-interacting protein 5 antisense RNA 1 (OIP5-AS1) is an lncRNA involved in cell proliferation, migration, invasion, and apoptosis in colorectal cancer (Wang, Lin & Liu, 2021), endometrial carcinoma (Liang et al., 2021), osteosarcoma (Dai et al., 2018), and hepatocellular carcinoma (Wang et al., 2019).