As shown in Figures 4A, B, the AUC of lncRNA RMRP (0.727 [95% CI: 0.657–0.797]), RPPH1 (0.774 [95% CI: 0.702–0.845]) and linc-ROR (0.811 [95% CI: 0.746–0.877]) were higher than that of CEA (0.601 [95% CI: 0.517–0.684]), demonstrating a high classification power for distinguishing patients with GC from healthy controls. This evidence concerns the gene CEACAM5 and gastric cancer.