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Table 1 Characteristics of studies included in the meta-analysis
| First author | Year | Country | Ethnicity | Cancer type | Source of controls | Cases | Controls | Case | Control | HWE | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| CC | CA | AA | CC | CA | AA | |||||||||
| Andersen[29] | 2009 | Denmark | Caucasian | Colorectal cancer | PB | 359 | 765 | 296 | 58 | 5 | 592 | 161 | 12 | 0.782 |
| Campa[31] | 2008 | Germany | Caucasian | Colorectal cancer | HB | 582 | 517 | 472 | 103 | 7 | 409 | 104 | 4 | 0.347 |
| Campa[30] | 2011 | Germany | Caucasian | Lymphoma | HB | 1067 | 1196 | 898 | 158 | 11 | 957 | 229 | 10 | 0.359 |
| Campa[30] | 2011 | Germany | Caucasian | Lymphoma | HB | 259 | 1156 | 224 | 33 | 2 | 921 | 221 | 14 | 0.856 |
| Hu[33] | 2007 | China | Asian | Lymphoma | MIXED | 156 | 376 | 60 | 80 | 16 | 181 | 162 | 33 | 0.703 |
| Campa[30] | 2011 | Germany | Caucasian | Leukemia | HB | 321 | 1196 | 284 | 33 | 4 | 957 | 229 | 10 | 0.359 |
| Muller[35] | 2008 | Germany | Caucasian | Leukemia | HB | 110 | 179 | 100 | 10 | 0 | 160 | 18 | 1 | 0.532 |
| Semsei[36] | 2008 | Hungary | Caucasian | Leukemia | HB | 369 | 149 | 294 | 72 | 3 | 121 | 28 | 0 | 0.206 |
| Korenaga[34] | 2005 | Japan | Asian | Renal cell carcinoma | PB | 200 | 200 | 124 | 60 | 16 | 92 | 91 | 17 | 0.405 |
| Gardner[32] | 2008 | America | Caucasian | Prostate cancer | PB | 170 | 141 | 142 | 27 | 1 | 111 | 27 | 3 | 0.384 |
