Table 1. Characteristics of the studies included in the meta-analysis.
| First Author | Year | Country | Ethnicity | Type of cancer | Case/Control | Platform | Genotyped SNPs |
|---|---|---|---|---|---|---|---|
| Zhang | 2014 | China | Asian | ESCC a | 2098/2150 | PCR-RFLP | rs920778, rs4759314, rs1899663 |
| Bayram | 2015 | Turkey | Caucasian | gastric cancer | 104/209 | TaqMan | rs920778 |
| Pan | 2015 | China | Asian | gastric cancer | 800/1600 | PCR-RFLP | rs920778, rs4759314, rs1899663 |
| Xue | 2015 | China | Asian | colorectal cancer | 1734/1855 | TaqMan | rs4759314 |
| Du | 2015 | China | Asian | gastric cancer | 1275/1646 | TaqMan | rs4759314 |
| Guo | 2015 | China | Asian | GCA b | 515/654 | PCR-RFLP | rs4759314 |
| Bayram | 2015 | Turkey | Caucasian | breast cancer | 123/122 | TaqMan | rs920778 |
| Yan | 2015 | China | Asian | breast cancer | 502/504 | CRS–RFLP/PCR-RFLP | rs920778, rs4759314, rs1899663 |
a oesophageal squamous cell carcinoma (ESCC)
b gastric cardia adenocarcinoma (GCA)