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Table 1 Basic information for studies included

From: RETRACTED ARTICLE: Meta-analysis of the associations between TNF-α or IL-6 gene polymorphisms and susceptibility to lung cancer

First author

Year

Country

Ethnicity

Polymorphisms

Number of cases

Number of controls

Method

HWE

Helmig

2010

Germany

European

TNF-α 308G/A

374

177

Real-time PCR

Yes

Flego

2009

Croatia

European

TNF-α 308G/A

230

230

PCR-RFLP

Yes

Stankovic

2009

Serbia

European

TNF-α 308G/A

70

102

PCR-RFLP

Yes

Colakogullari

2008

Turkey

European

TNF-α 308G/A IL-6 174G/C

44

59

PCR-SSP

Yes

Vogel

2008

Denmark

European

IL-6 174G/C

403

744

PCR

Yes

Seifart

2006

Germany

European

TNF-α 308G/A IL-6 174G/C

117

243

PCR-RFLP

Yes

Shih

2006

China

Asian

TNF-α 308G/A

202

205

PCR-RFLP

Yes

Campa

2004

Norway

European

IL-6 174G/C

250

214

Taqman

Yes

  1. TNF: tumor necrosis factor; IL: interleukin; PCR: polymerase chain reaction; PCR-RFLP: polymerase chain reaction-restriction fragment length polymorphism; PCR-SSP: polymerase chain reaction-sequence specific primer; HWE: Hardy-Weinberg Equilibrium.