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Table 1 Baseline characteristics of the selected studies

From: The prognostic role of platelet-to-lymphocyte ratio on overall survival in gastric cancer: a systematic review and meta-analysis

Study

Publication year

Study design

Country

Sample size

Percent of male (%)

Mean age (years)

Treatment strategy

Disease status

Cutoff value of PLR

NOS score

Aliustaoglu [23]

2010

Retrospective

Turkey

168

67.8

60.1

Chemotherapy

Advanced

160

6

Lee [32]

2013

Retrospective

Korea

174

65.5

55.0

Chemotherapy

Advanced

160

8

Jiang [30]

2014

Prospective

China

377

67.1

64.0

Surgery

Early

184

7

Wang [45]

2014

Retrospective

China

439

72.7

NA

Mixed

Advanced

160

7

Lian [33]

2015

Retrospective

China

162

69.8

56.3

Surgery

All

208

8

Aldemir [22]

2015

Retrospective

Turkey

103

56.3

58.0

Mixed

Early and Advanced

170

7

Deng [24]

2015

Retrospective

China

389

72.5

65.0

Surgery

All

132

8

Gunaldi [28]

2015

Retrospective

Turkey

245

72.2

59.6

Mixed

All

160

7

Hsu [29]

2015

Retrospective

China

1030

64.5

NA

Surgery

All

132

7

Kim [31]

2015

Prospective

Korea

1986

66.3

58.2

Surgery

Early

126

7

Liu [34]

2015

Retrospective

China

455

69.0

59.0

Surgery

Early

188

6

Sun [39]

2015

Retrospective

China

632

65.3

57.0

Surgery

All

140

7

Wang [42]

2015

Retrospective

China

120

62.5

68.0

Chemotherapy

Advanced

235

8

Feng [25]

2016

Retrospective

China

3243

78.3

57.3

Mixed

Advanced

130

7

Sun [40]

2016

Retrospective

China

305

66.2

57.0

Surgery

Early

120

8

Zhou [49]

2016

Retrospective

China

451

71.8

NA

Surgery

Early

255

7

Wen [46]

2017

Retrospective

UK

253

66.1

75.5

Surgery

All

150

6

Fuentes [26]

2017

Retrospective

USA

112

66.1

58.0

Mixed

Advanced

260

6

Song [38]

2017

Retrospective

China

1990

73.7

62.0

Surgery

Advanced

139

7

Wang [43]

2017

Retrospective

China

273

68.1

56.7

Chemotherapy

Advanced

202

6

Wang [44]

2017

Retrospective

China

444

63.3

56.0

Surgery

All

120

7

Ramos-Esquivel [36]

2018

Retrospective

Costa Rica

381

57.2

61.2

Mixed

All

350

7

Petrillo [35]

2018

Retrospective

Italy

151

64.2

62.0

Chemotherapy

Advanced

157

8

Saito [37]

2018

Retrospective

Japan

453

73.1

67.7

Surgery

All

173

7

Gong [27]

2018

Retrospective

China

91

75.8

55.0

Mixed

Advanced

108

7

Zhang [48]

2018

Retrospective

China

182

67.0

65.0

Mixed

All

172

7

Tang [41]

2018

Retrospective

China

104

71.2

NA

Chemotherapy

Advanced

131

6

Zhang [47]

2018

Retrospective

China

904

74.4

NA

Surgery

All

160

7