TUSC7 and gastric cancer: Tumor suppressor candidate 7 (TUSC7) located at 3q13.31 encodes a lncRNA, which is a potential tumor suppressor in gastric cancer, non-small-cell lung cancer, osteosarcoma and hepatocellular carcinoma (Qi et al., 2015; Cong et al., 2016; Wang Y. et al., 2016; Wang Z. et al., 2016).