GGT5 and gastric cancer: Through data mining in the TCGA database and the Kaplan–Meier plotter (http://kmplot.com/analysis/index.php?p=service), we observed significantly lower overall survival (OS) and disease-free survival (DFS) among gastric cancer patients with high GGT5 expression compared to those with low expression, using the median as the cutoff value (all p < 0.05, Fig. 4E-G).