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Table 1 Characteristics of the studies recruited for the meta-analysis

From: Association between OGG1 Ser326Cys polymorphism and risk of upper aero-digestive tract and gastrointestinal cancers: a meta-analysis

Serial no. Publications Number of controls/cases Cancer types Country Ethnicity Genotyping method Association/risk
1 Kumar et al. (2011) 278/278 Head and neck India Asian PCR–RFLP High association/increased risk
2 Sliwinski et al. (2011) 280/265 Head and neck Poland Caucasian PCR–RFLP High association/increased risk
3 Gorgens et al. (2007) 30/29 Oral Germany Caucasian PCR-Cycle sequencing No association
4 Li et al. (2013) 300/231 Nasopharyngeal China Asian PCR-CTPP No association
5 Laantri et al. (2011) 506/541 Nasopharyngeal North-African Caucasian TaqMan No association
6 Upadhyay et al. (2010) 195/135 Esophageal India Asian PCR-CTPP No association
7 Canbay et al. (2010) 247/40 Gastric Turkey Caucasian PCR–RFLP No association
8 Palli et al. (2010) 545/304 Gastric Italy Caucasian TaqMan No association
9 Engin et al. (2011) 116/106 Gastric Turkey Caucasian PCR–RFLP No association
10 Canbay et al. (2011) 247/79 Colorectal Turkey Caucasian PCR–RFLP High association/increased risk
11 Curtin et al. (2009) 1951/1582 Colorectal USA Caucasian TaqMan Weak association slightly increased risk
12 Sameer et al. (2012) 200/114 Colorectal India Asian PCR-CTPP No association
13 Przybylowska et al. (2013) 200/172 Colorectal Poland Caucasian PCR–RFLP High association/increased risk
14 Pardini et al. (2008) 532/532 Colorectal CzechRepublic Caucasian PCR–RFLP Weak association/slightly increased risk
15 Li et al. (2009) 773/722 Pancreas USA Caucasian TaqMan Weak association/increased risk
16 Srivastava et al. (2009) 204/173 Gallbladder India Asian PCR–RFLP High association/increased risk
17 Srivastava et al. (2010) 230/230 Gallbladder India Asian PCR–RFLP High association/increased risk