For example, the circulating CUDR, LSINCT-5, and PTENP1 lncRNAs in sera could distinguish patients with gastric cancer from healthy controls with an AUC of up to 0.829, which was much higher than the predictive ability reported for CEA and CA19-9.[24] To date, there has only been 1 report concerning the diagnosis of HCC; however, this report used a single tumor-specific lncRNA, and the systematic study was deficient.[16]. This evidence concerns the gene PTENP1 and gastric cancer.