PURPL and gastric cancer: Overlapped candidates were ranked according to the fold change and the top 20 are shown in a heatmap (Fig. 1B), while the P values and HRs of these top 20 upregulated lncRNAs in the survival analysis are presented in Fig. 1C. Previous reports by other groups have showed that LINC00460 [18], LINC01021 [19] and LINC01234 [20] play oncogenic roles in GC, confirming the reliability of our analysis (Fig. 1B and C), and these lncRNAs were therefore excluded from further investigation.