ADH1C and gastric cancer: However, ADH1C G allele carriers who drink ≥150 g/week of ethanol had a 2.5-fold increased risk of gastric cancer development (OR = 2.54, 95% CI = 1.05−6.17) relative to AA genotype carriers who do not drink at all or drink <150 g/week (P for interaction = 0.02) [34].