ALDH2 and gastric cancer: In contrast, most existing studies found no evidence of interaction between ALDH2‐rs671 and alcohol consumption for colorectal cancer,16, 18, 23, 35, 42 whereas findings for liver cancer,22, 43, 44 stomach cancer,19, 23, 38, 45, 46, 47 and lung cancer36, 48 have been inconclusive.