PTGDR and gastric cancer: For example, gastric cancer patients carrying ABCA13 mutant in C2 group is found to have an upregulated expression of LINC2826, AC25575.2, and AFAP-AS1 than the wild type (Supplementary Fig. 2), but no difference of AC25575.2 and AFAP-AS1 expression is observed in the C1 group, suggesting that ABCA13 is epigenetically regulated by these lncRNAs which collectively affects the survival of gastric cancer.