PVT1 and gastric adenocarcinoma: As shown in Table 2, the signature consisting of four lncRNAs (PVT1, LINC01315, AC245041.1, and AC037198.1) was identified as a potential prognostic biomarker for STAD, and the risk score of each patient in the training cohort was calculated based on the expression and coefficients of the four lncRNAs by multivariate Cox regression.