DUXAP9 and gastric adenocarcinoma: According to both the data from GEPIA (http://gepia.cancer-pku.cn) and TCGA (https://portal.gdc.cancer.gov/), we unveiled that the expression of LINC01559, LINC00483, LINC01296, RAET1E-AS1 and PCED1B-AS1 was significantly high in STAD (stomach adenocarcinoma) tissues in contrast with normal gastric tissues (Fig. 1a, Supplementary Fig. 1A).