ALDH2 and gastric cancer: The results of our meta-analysis suggested that ALDH2 genetic polymorphisms might be strongly correlated with an increased risk of gastric cancer (allele model: OR  = 1.21, 95%CI: 1.11∼1.32, P<0.001; dominant model: OR  = 1.23, 95%CI: 1.09∼1.39, P = 0.001; respectively), especially for rs671 polymorphism.