Polymorphism of CYPIA1 and GSTM1 genes associated with susceptibility of gastric cancer in Shandong Province of China

Table 5 Relative risk of stomach cancer for combined CYPIA1 genotype and smoking

CYPIA1	Smoking	Controls	Cases	OR1	95%CI
A/A	None	21	21	1.00
	Yes	14	32	1.53	0.47	4.96
A/G	None	18	12	0.62	0.20	1.89
	Yes	6	15	0.92	0.24	3.53
G/G	None	3	13	4.90	0.90	26.73
	Yes	0	9	19.02	7.27	54.06

¹Adjusted for age, sex, education, and occupation; CI: confidence interval; ²weighed OR by adding to 0.5 for each cell number.