Table 1. Baseline characteristics of studies associated with the risk of RCC included in the meta-analysis.
| Ref. | Year | Surname | Ethnicity | SOC | Genotyping | Cases | Controls | Gene polymorphism | NOS | HWE |
|---|---|---|---|---|---|---|---|---|---|---|
| [26] | 2015 | Yang | Asian | HB | Taqman | 191 | 376 | −2578C/A, −1154G/A, −634G/C, +936C/T | 6 | Y |
| [23] | 2015 | Shen | Asian | HB | PCR-RFLP | 360 | 360 | −2578C/A, +1612G/A, +936C/T, −634G/C | 5 | Y |
| [24] | 2015 | Xian | Asian | HB | PCR-RFLP | 266 | 532 | −2578C/A, +1612G/A, +936C/T, −634G/C | 5 | Y |
| [25] | 2015 | Lu | Asian | HB | PCR-RFLP | 412 | 824 | −2578C/A,+1612G/A,+460T/C, +936C/T, −634G/C | 5 | Y |
| [27] | 2014 | Qin | Asian | HB | Taqman | 859 | 1004 | +405G/C | 7 | Y |
| [28] | 2013 | Sáenz-López | Caucasian | HB | Taqman | 216 | 280 | −2578C/A, +460T/C, +405G/C, +936C/T | 6 | Y |
| [29] | 2011 | Ajaz | Asian | HB | PCR-RFLP | 143 | 106 | −2578C/A,+936C/T | 5 | Y |
| [30] | 2010 | Bruyère | Caucasian | HB | PCR-RFLP | 51 | 202 | +460T/C, +405G/C, +936C/T, −1154G/A | 5 | Y |
| [31] | 2009 | Ricketts | Caucasian | HB | PCR-RFLP | 317 | 295 | −1154G/A | 6 | Y |
| [32] | 2002 | Abe | Asian | HB | PCR-RFLP | 145 | 145 | +936C/T, +1612G/A | 5 | Y |
SOC: source of control; HB: hospital-based; HWE: Hardy–Weinberg equilibrium.
NOS: Newcastle-Ottawa Scale