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Table 1 Baseline characteristics of the 18 eligible studies for the analysis of IL-8-251 A > T polymorphism

From: Positive association between Interleukin-8 -251A > T polymorphism and susceptibility to gastric carcinogenesis: a meta-analysis

Studies

Year

Country

Ethnicity

Source of controls

Number of controls

Number of case

Genotyping method

HWE

Burada F

2012

Romanian

Caucasian

HB

242

105

Real-time PCR

0.386

Canedo P

2007

Portugal

Caucasian

PB

693

401

Taqman

0.460

Crusius JB

2008

European

Caucasian

HB

1139

428

Real-time PCR

0.706

Kamangar F

2006

Finland

Caucasian

PB

207

112

Taqman

0.055

Kang JM

2009

Korea

Asian

HB

322

645

RFLP

0.226

Lee WP

2005

Taiwan

Asian

HB

308

461

RFLP

0.143

Liu J

2009

China

Asian

HB

137

417

Taqman

0.145

Lu W

2005

China

Asian

PB

300

250

DHPLC

0.516

Ohyauchi M

2005

Japan

Asian

PB

346

212

Direct sequence analysis

0.549

Savage SA

2004

Poland

Caucasian

PB

429

88

SBE

0.885

Savage SA

2006

Poland

Caucasian

PB

428

287

Taqman or MGB Eclipse

0.391

Shirai K

2005

Japan

Asians

HB

468

181

RFLP

0.830

Song B

2010

China

Asian

HB

190

208

RFLP

0.389

Taguchi A

2005

Japan

Asian

HB

252

611

RFLP

0.994

Vinagre RM

2011

Brazil

Mixed

HB

103

102

RFLP

0.151

Ye BD

2009

Korea

Asian

HB

206

399

RFLP

0.553

Zeng ZR

2005

China

Asian

PB

196

206

PCR-RDB

0.022

Zhang LW

2010

China

Asian

PB

504

519

PCR-RFLP

0.754

  1. PB, population-based controls; HB, hospital-based controls. HWE, Hardy–Weinberg equilibrium. PCR, polymerase chain reaction; RFLP, restriction fragment length polymorphism; SBE, single base extension; PCR-RDB, polymerase chain reaction- reverse dot blot.