Table 1. Characteristics of case-control studies included in the meta-analysis.

First author	Year	Country	Ethnicity	Type	Sample size	Genotyping method	HWE	Score
					Case/Control
Bodelon C	2013	USA	Caucasian	BC	840/801	IGGMP	Yes	6
Bracci PM	2010	USA + UK	Caucasian	NHL	255/511	IGGMP	Yes	8
Cacina C	2012	Turkey	Asian	EC	113/139	PCR-RFLP	Yes	6
Cai C	2013	China	Asian	RC	322/402	PCR-RFLP	Yes	7
de Lourdes Perim A	2013	Brazil	Caucasian	ALL	54/58	PCR-RFLP	Yes	6
de Oliveira CE	2007	Brazil	Caucasian	CML	25/60	PCR-RFLP	Yes	5
de Oliveira KB	2009	Brazil	Caucasian	BC	103/97	PCR-RFLP	Yes	5
de Oliveira KB	2010	Brazil	Caucasian	NHL + HL	106/90	PCR-RFLP	Yes	5
Dimberg J	2007	Sweden	Caucasian	CRC	151/141	PCR-RFLP	Yes	5
Gawron AJ	2011	Poland	Caucasian	GC	292/414	TaqMan	Yes	7
Hidalgo-Pascual M	2007	Spain	Caucasian	CRC	349/516	Real-time PCR	Yes	6
Hirata H	2007	Japan	Asian	PC	167/167	PCR-RFLP	Yes	5
Isman FK	2012	Turkey	Asian	PC	152/149	PCR-RFLP	Yes	7
Khademi B	2008	Iran	Asian	HC + NC	156/262	PCR-RFLP	Yes	6
Kontogianni P	2013	Greece	Caucasian	BC	261/480	PCR-RFLP	Yes	6
Kruszyna L	2010	Poland	Caucasian	BC	193/199	PCR-RFLP	Yes	6
Kruszyna L	2010	Poland	Caucasian	LAC	118/250	PCR-RFLP	Yes	6
Kucukgergin C	2012	Turkey	Asian	BLC	142/197	PCR-RFLP	Yes	7
Lee YL	2011	China	Asian	LC	247/328	PCR-RFLP	Yes	7
Liarmakopoulos E	2013	Greece	Caucasian	GC	88/480	PCR-RFLP	Yes	6
Lin GT	2009	China	Asian	BC	220/334	PCR-RFLP	Yes	4
Maley SN	2009	USA	Caucasian	CC	899/820	TaqMan	Yes	7
Mazur G	2013	Poland	Caucasian	MM	54/75	PCR-RFLP	Yes	4
Pemberton NC	2006	UK	Caucasian	CLL	323/108	PCR-RFLP	Yes	5
Petersen DC	2008	Australia	Caucasian	PC	815/727	TaqMan	Yes	6
Razmkhah M	2013	Iran	Asian	GC + CC	233/262	PCR-RFLP	Yes	4
Razmkhah M	2005	Iran	Asian	BC	278/181	PCR-RFLP	Yes	6
Razmkhah M	2005	Iran	Asian	LC	72/262	PCR-RFLP	Yes	4
Shi MD	2013	China	Asian	CRC	258/300	DHPLC	Yes	5
Singh V	2014	India	Asian	BLC	200/200	PCR-RFLP	Yes	7
Tee YT	2012	China	Asian	CC	137/337	PCR-RFLP	Yes	7
Vairaktaris E	2008	Europe	Caucasian	OC	159/101	PCR-RFLP	Yes	6
Vázquez-Lavista LG	2009	Mexico	Mixed	BLC	47/126	PCR-RFLP	Yes	7
Wong HL	2010	USA	Mixed	NHL	233/240	TaqMan	Yes	7

BC = breast cancer; EC = endometrial cancer; RC = renal cancer; ALL = acute lymphatic leukaemia; CML = chronic myeloid leukaemia; NHL non-Hodgkin’s lymphoma; HL = Hodgkin’s lymphoma; CRC = colorectal cancer; GC = gastric cancer; PC = prostate cancer; HC = head cancer; NC = neck cancer; LAC = laryngeal cancer; BLC = bladder cancer; LC = lung cancer; CC = cervical cancer; MM = multiple myeloma; CLL = chronic lymphocytic leukaemia; OC = ovarian cancer; IGGMP = Illumina Golden Gate multiplex platform; PCR-RFLP = polymerase chain reaction-restricted fragment length polymorphism; DHPLC  = denaturing high performance liquid chromatography.