PTGDR and gastric cancer: Increasing evidences revealed that non‐coding RNAs, particularly lncRNAs and miRNAs, have considerable potential values in improving the diagnostic and therapeutic of GC.25, 26 Researchers have found a large number of lncRNAs in GC development, such as lncRNA HOXC‐AS3,27 LINC012344 and lncRNA‐KRTAP5‐AS1.28 Aberrantly expressed lncRNAs are involved in various malignant cytological behaviours of GC cells.