Table 1.

Characteristics of case-control studies included in meta-analysis

Author	Year	Country	Ethnicity	Cancer type	No.(Cases/Controls)	Genotyping method
Arima, H[14]	2006	Japan	Asian	Cancers	176/761	PCR
Bardi, E[34]	2005	Hungary	European	Cancers	207/144	PCR
Cheon, K T[29]	2000	Korea	Asian	Lung	218/121	PCR
Ding, × J[30]	2008	China	Asian	Lung	121/33	PCR
Goto, Y[10]	2005	Japan	Asian	Gastric	202/454	PCR
Haiman, C A(AF)[6]	2003	USA	African-American	Breast	257/631	PCR
Haiman, C A(JP)[6]	2003	USA	Asian	Breast	284/357	PCR
Haiman, C A(Latinas)[6]	2003	USA	Latino	Breast	249/652	PCR
Haiman, C A(Whites)[6]	2003	USA	European	Breast	292/402	PCR
Holla, L[35]	1998	Czech	European	Leukemia	25/202	PCR
Nacak, M[3]	2010	Turkey	European	Lung	125/165	PCR
Nikiteas, N[16]	2007	Greece	European	colorectal	92/102	PCR
Rocken, C[7]	2005	Germany	European	Gastric	113/189	PCR
Rocken, C[31]	2007	Germany	European	Colorectal	141/189	PCR
Sierra, Diaz E[18]	2009	Mexico	Latino	Prostate	19/28	PCR
Sugimoto, M[4]	2006	Japan	Asian	Gastric	119/132	PCR
Toma, M[13]	2009	Romanian	European	Colorectal	108/150	PCR
Tunny, T J[17]	1996	Australia	European	Aldosterone-producing adenoma	55/80	PCR
Vairaktaris, E[32]	2009	Greece	European	Oral	160/153	PCR
van der Knaap, R[12]	2008	Netherlands	European	Colorectal, lung, breast, prostate	655/6015	PCR
Vaskù, V[9]	2004	Czech	European	T-cell lymphoma	77/203	PCR
Wang, H W[11]	2000	China	Asian	Lung	34/38	PCR
Yeren, A[15]	2008	Turkey	European	Lung	75/85	PCR
Yigit, B[5]	2007	Turkey	European	Prostate	48/51	PCR
Zhang Q Z[33]	2005	China	Asian	Lung	47/54	PCR