Table 1. Characteristics of studies included in the meta-analysis.
| ID | First author | Year | Country | Ethnic group | Cancer type | Case | Control | HWE |
|---|---|---|---|---|---|---|---|---|
| 1 | Borbely | 2006 | Hungary | European | Cervical cancer | 81 | 180 | 0.856 |
| 2 | Kawata | 2010 | Japan | Asia | Bladder cancer | 235 | 346 | 0.228 |
| 3 | Borges | 2010 | Brazilian | Mixed | Gastric cancer | 47 | 57 | 0.784 |
| 4 | Theodoropoulos | 2010 | Greece | European | Pancreatic cancer | 80 | 160 | 0.062 |
| 5 | Wang | 2009 | China | Asia | Urothelial cancer | 190 | 210 | 0.024 |
| 6 | Jang | 2008 | Korea | Asia | Lung cancer | 582 | 582 | 0.867 |
| 7 | Gazouli | 2009 | Greece | European | Colorectal cancer | 312 | 362 | 0.110 |
| 8 | Yang | 2009 | China | Asia | Esophageal cancer | 221 | 268 | 0.249 |
| 9 | Upadhyay | 2010 | India | European | Esophageal cancer | 250 | 250 | 0.094 |
| 10 | Cheng | 2008 | China | Asia | Gastric cancer | 96 | 67 | 0.667 |
| 11 | Yang | 2009 | China | Asia | Gastric cancer | 220 | 220 | 0.104 |
| 12 | Bayram | 2011 | Turkey | European | Hepatocellular cancer | 160 | 241 | 0.109 |
| 13 | Ma | 2011 | China | Asia | Nasopharyngeal cancer | 844 | 1021 | 0.357 |
| 14 | Han | 2009 | USA | European | Ovarian cancer | 167 | / | / |
Abbreviations: HWE, Hardy–Weinberg Equilibrium of Genotype of Control C, confirmed to HWE.