Table 1 Characteristics of the studies recruited for the 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 |