Table 1.
Characteristics of included studies.
| Author and year | Gender (Female/Male) | Age | SOC | Nationality | Ethnicity | Case/Control | Genotyping method | HWE | NOS | ||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Case | Control | Case | Control | ||||||||
| Jang et al., 2001 | N/A | N/A | N/A | N/A | HB | Korea | Asian | 52/92 | PCR-RFLP | 0.391 | 6 |
| Wu et al., 2002 | N/A | N/A | N/A | N/A | HB | Taiwan | Asian | 150/220 | Sequencing | <0.001 | 5 |
| Wu et al., 2003 | 84/136 | 88/142 | 60.9 ± 12.6 | 60.7 ± 13.4 | HB | Taiwan | Asian | 220/230 | Sequencing | <0.001 | 6 |
| Glas et al., 2004 | 71/74 | 41/47 | 65 ± 12.5 | 45 ± 12.5 | HB | Germany | Caucasian | 145/88 | PCR-RFLP | 0.635 | 6 |
| Lee et al., 2004 | 142/199 | 123/138 | 46.0 ± 12.6 | 48.7 ± 10.9 | HB | Korea | Asian | 341/261 | Sequencing | 0.416 | 6 |
| Wu et al., 2004 | 78/126 | 84/126 | 60.1 ± 12.1 | 58.7 ± 14.4 | HB | Taiwan | Asian | 204/210 | Sequencing | <0.001 | 6 |
| Lu et al., 2005 | 67/183 | 83/217 | 59.0 ± 12.3 | 59.1 ± 9.4 | PB | China | Asian | 250/300 | DHPLC | 0.49 | 7 |
| Zambon et al., 2005 | N/A | N/A | N/A | N/A | HB | Italy | Caucasian | 129/644 | TaqMan | 0.378 | 6 |
| Kamangar et al., 2006 | N/A | N/A | N/A | N/A | PB | Finland | Caucasian | 210/115 | TaqMan | <0.001 | 7 |
| Zambon et al., 2005 | 60/70 | 72/70 | 58.6 ± 13.3 | 53.5 ± 11.2 | HB | China | Asian | 130/142 | gene chip | 0.23 | 6 |
| Hou et al., 2007 | 103/202 | 152/275 | <50 39 50–59 56 60–69 120 ≥70 90 |
<50 52 50–59 75 60–69 168 ≥70 132 |
PB | Poland | Caucasian | 299/412 | TaqMan | 0.492 | 6 |
| Garcia-Gonzalez et al., 2007 | 146/258 | 138/266 | 73.7 ± 10.3 | 71.3 ± 12.0 | HB | Spain | Caucasian | 404/404 | TaqMan | 0.011 | 6 |
| Zeng et al., 2007 | 60/70 | 72/70 | 59.0 ± 13.0 | 54.0 ± 11.0 | HB | China | Asian | 130/142 | gene chip | 0.23 | 7 |
| Crusius2008 | N/A | N/A | N/A | N/A | PB | Europe | Caucasian | 235/1123 | TaqMan | 0.367 | 8 |
| Yang et al., 2009 | 25/59 | 100/236 | ≤ 63 43 >63 41 |
≤63 176 >63 160 |
PB | Korea | Asian | 83/331 | SNaPshot | 0.457 | 6 |
| Bai et al., 2009 | 50/64 | 56/63 | 58.3 ± 12.5 | 55.9 ± 14.9 | HB | China | Asian | 114/119 | gene chip | 0.668 | 6 |
| Whiteman et al., 2010 | 22/247 | 459/896 | <49 21 50–59 75 60–69 103 70–79 70 |
<49 216 50–59 348 60–69 480 70–79 311 |
PB | Australia | Caucasian | 289/1299 | gene chip | 0.007 | 7 |
| Yin et al., 2012 | N/A | N/A | N/A | N/A | HB | China | Asian | 310/485 | SNaPshot | 0.369 | 6 |
| Essadik et al., 2015 | N/A | N/A | N/A | N/A | PB | Morocco | Caucasian | 93/74 | Sequencing | 0.978 | 7 |
| Xu et al., 2017 | 169/127 | 180/139 | 44.0 ± 16.6 | 44.3 ± 15.9 | HB | China | Asian | 294/319 | PCR-RFLP | 0.466 | 6 |
SOC, source of controls; PB, population-based controls; HB, hospital-based controls; NOS, Newcastle-Ottawa Scale; HWE, Hardy–Weinberg equilibrium; PCR-RFLR, PCR-restriction fragment length polymorphism; DHPLC, Denaturing high-performance liquid chromatograph.