H19 and gastric cancer: In subgroups analysis, we found that the levels of H19 were significantly related to the histological grade (OR = 0.50, 95% CI = 0.29–0.86, P = 0.01), TNM stage (OR = 0.19, 95% CI = 0.11–0.33, P < 0.01), and tumor invasion depth (OR = 0.11, 95% CI = 0.04–0.27, P < 0.01) in GC.