A study using sera from gastric cancer patients suggested that circulating CUDR, PTENP1 and LSINCT-5 lncRNAs expression could distinguish patients with gastric cancer as early as stage 1 from healthy subjects and from patients with gastric ulcers, although there was no association between the lncRNAs and tumor characteristics (location, size, and TNM staging) [85]. This evidence concerns the gene PTENP1 and gastric cancer.