GSTMI and GSTTI polymorphisms and nasopharyngeal cancer risk: an evidence-based meta-analysis

Table 1 Case-control studies on GSTM1/GSTT1 polymorphisms and NPC risk

First Author	Publication Year	Cases	Controls	Histology	Ethnicity	genotype	Ref. number
Nazar-Stewart V	1999	83	142	11 Epithelial, Nos; 24 Undifferentiated; 48 Squamous	57 Caucasian; 7 African-American; 17 Asian; 2 Native American	GSTM1	[7]
Da SJ	2002	80	80	72 Squamous, 8 Adenocarcinoma	80 Asian (China)	GSTM1	[8]
Cheng YJ	2003	314	337	Not Determined	314 Asian (China)	GSTM1; GSTT1	[11]
Deng ZL	2004	91	135	91 Squamous	91 Asian (China)	GSTM1; GSTT1	[12]
Liao ZL	2005	80	72	Not Determined	80 Asian (China)	GSTM1	[9]
Tiwawech D	2005	78	145	Not Determined	78 Asian (Thailand)	GSTM1	[10]
Bendjemana K	2006	45	100	Not Determined	45 Caucasian (France)	GSTM1; GSTT1	[13]
Guo X	2008	341	590	Not Determined	341 Asian (China)	GSTM1; GSTT1	[14]

ISSN: 1756-9966