Table 6. Characteristics of gastric cancer case-control studies included in meta-analysis on the association between CYP2E1 polymorphisms and gastric cancer.

Study			Year	Population	Case			Control
PstI restriction analysis					C1C1	C1C2	C2C2	C1C1	C1C2	C2C2
Park et al		2003		Koreans	80	33	7	94	48	3
Cai et al		2001		Chinese	58	27	6	71	22	1
Nishimoto et al		2000		Brazilian	209	38	1	241	75	8
Tsukino et al		2002		Japanese	71	42	7	88	58	12
Gao et al		2002		Chinese	58	31	9	121	62	13
Colombo et al		2004		Brazilian	89	11	0	134	16	0
Nan et al		2005		Korean	268	148a		400	230a
Suzuki et al		2004		Japanese	107	38a		112	65a
Wu et al		2002		Chinese	215	108	33	199	70	9
Cai et al		2005		Chinese	96	57	6	77	110	5
Malik et al		2009		Indian	88	20	0	177	17	1
Kato et al		2011		Japanese	280	186a		340	213a
Current study				Chinese	348	128	34	374	119	17
DraI restriction analysis					TT	TA	AA	TT	TA	AA
Park et al	2003			Koreans	35	7	78	45	8	85
Wu et al	2002			Chinese	195	120	41	158	100	20
Current study				Chinese	334	131	45	348	121	41

^aC1C2+C2C2.