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

Table 3 Odds ratios (OR) and 95% confidence interval (CI) of the association between ABO genotypes and gastric cancer risk^a

	First allele
Second allele	O	A	B
O
No. of cases	1480	1308	1169
No. of controls	1906	1508	1569
Multivariable-adjusted OR (95% CI)	Reference	1.14 (1.03–1.26)*	0.96 (0.87–1.07)
A
No. of cases	–	255	–
No. of controls		313
Multivariable-adjusted OR (95% CI)		1.07 (0.89–1.29)
B
No. of cases	–	496	224
No. of controls		547	315
Multivariable-adjusted OR (95% CI)		1.18 (1.02–1.36)*	0.95 (0.78–1.15)

^aOR, 95% CI and P-value were derived from unconditional logistic regression models adjusted for age, sex, and study site
OR odds ratio, CI confidence interval
* indicates statistically significant

ISSN: 1471-2407