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Table 2 Associations between ABO genotypes and gastric cancer riska

From: Blood groups A and AB are associated with increased gastric cancer risk: evidence from a large genetic study and systematic review

Blood group No. of cases Phenotype frequency in cases, % No. of controls Phenotype frequency in controls, % OR 95% CI P
O (alleles OO) 1480 30.01 1906 30.95 1.00   
A (alleles AA, AO) 1563 31.69 1821 29.57 1.13 1.02–1.24 0.018*
B (alleles BB, BO) 1393 28.24 1884 30.59 0.96 0.87–1.06 0.410
AB (alleles AB) 496 10.06 547 8.88 1.18 1.02–1.36 0.024*
  1. aOR, 95% CI and P-value were derived from unconditional logistic regression models adjusted for age, sex and study site
  2. OR odds ratio, CI confidence interval
  3. * indicates statistically significant