Table 1.
Characteristics of studies included in this meta-analysis.
| Author | Year | Country | Ethnicity | Type of cancer | No. (cases/controls) | Genotypes case (%) | Genotypes control (%) | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| TT | TC | CC | TT | TC | CC | ||||||
| Bensen et al. | 2013 | America | African American | Breast cancer | 742/658 | 362 (48.8) | 317 (42.7) | 63 (8.5) | 343 (52.1) | 257 (39.1) | 58 (8.8) |
| Bensen et al. | 2013 | America | Caucasian | Breast cancer | 1203/1088 | 496 (41.2) | 563 (46.8) | 144 (12.0) | 430 (39.5) | 503 (46.2) | 155 (14.2) |
| Gao et al. | 2013 | China | Asian | Colorectal cancer | 347/488 | 175 (50.4) | 144 (41.5) | 28 (8.1) | 216 (44.3) | 210 (43.0) | 62 (12.7) |
| Han et al. | 2013 | China | Asian | Hepatocellular carcinoma | 1013/999 | 451 (44.5) | 444 (43.8) | 118 (11.6) | 456 (45.6) | 424 (42.4) | 119 (11.9) |
| Li et al. | 2013 | China | Asian | Nasopharyngeal carcinoma | 217/360 | 82 (37.8) | 104 (47.9) | 31 (14.3) | 168 (46.7) | 155 (43.1) | 37 (10.3) |
| Oh et al. | 2014 | Korea | Asian | Colorectal cancer | 545/428 | 272 (49.9) | 233 (42.8) | 40 (7.3) | 216 (50.5) | 171 (40.0) | 41 (9.5) |
| Son et al. | 2014 | Korea | Asian | Hepatocellular carcinoma | 157/201 | 69 (43.9) | 75 (47.8) | 13 (8.3) | 110 (54.7) | 74 (36.8) | 17 (8.5) |
| Tian et al. | 2014 | China | Asian | Osteosarcoma | 133/133 | 41 (30.8) | 62 (46.6) | 30 (22.6) | 62 (46.6) | 53 (39.8) | 18 (13.5) |
| Xu et al. | 2011 | China | Asian | Hepatocellular carcinoma | 502/549 | 204 (40.64) | 236 (47.01) | 62 (12.35) | 266 (48.45) | 229 (41.71) | 54 (9.84) |
| Yin et al. | 2013 | China | Asian | Esophageal cancer | 600/673 | 277 (46.2) | 278 (46.3) | 45 (7.5) | 310 (46.1) | 290 (43.1) | 73 (10.8) |
| Zhang et al. | 2014 | China | Asian | Renal cell cancer | 710/760 | 302 (42.5) | 324 (45.6) | 84 (11.8) | 352 (46.3) | 344 (45.3) | 64 (8.4) |