TTN and osteosarcoma: To further explore the mechanism by which lncRNA TTN-AS1 regulated osteosarcoma cell growth and apoptosis, we found through bioinformatics prediction and experimental studies that lncRNA TTN-AS1 targeted miR-134-5p levels as ceRNA and that miR-134-5p inhibited MBTD1 expression by directly binding to the 3′UTR region of MBTD1 mRNA.