ALDH2 and gastric cancer: While we did not find associations between ALDH2 rs886205 and cancer susceptibility in main effect analyses, stratum-specific SBOR suggested that ALDH2 rs886205 was positively associated with stomach cancer among participants with higher plasma vitamin B12 levels (SBOR: 1.87, 95% posterior limits: 1.09, 3.20) (Figure 1).