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Table 1 Characteristics of the included trials and particiants

From: Relationship between aspirin use of esophageal, gastric and colorectal cancer patient survival: a meta-analysis

Included Trials

Dedign

Region

database

Journal

Sample size

Period

aspirin use

Follow-up time

Surgerya

non-user/ user

Chemotherapyb

non-user/ user

gastric cancer

 Spence et al. [11] 2018

Cohort study

United Kingdom

cancer registries in England

Gastroenterology

2391

1998–2012

post-diagnosis use

until September 2015

947 (50.0%) /

273 (55.0%)

720 (38.0%) /

146 (29.4%)

 Spence et al. [11] 2018

Cohort study

United Kingdom

the Scottish Cancer Registry

Gastroenterology

1442

2009–2012

post-diagnosis use

until January 2015

376 (33.3%) /

124 (39.7%)

587 (51.9%) /

145 (46.5%)

 Frouws et al. [7] 2017

Cohort study

Netherlands

Eindhoven Cancer Registry

British Journal of Cancer

750

Jan 1998-Dec 2011

Pre- and post-diagnosis use

NA

Unknown

Unknown

esophageal cancer

 Macfarlane et al. [13] 2015

Cohort study

United Kingdom

PCCIU databaseIN Scotland

Cancer Epidemiology

1197

1996–2010

Pre- and post-diagnosis use

9

Unknown

Unknown

 Spence et al. [11] 2018

Cohort study

United Kingdom

cancer registries in England

Gastroenterology

2733

1998–2012

post-diagnosis use

until September 2015

879 (40.4%)

215(38.5%)

108(50.0%)

235(42.0%)

 Spence et al. [11] 2018

Cohort study

United Kingdom

the Scottish Cancer Registry

Gastroenterology

1921

2009–2012

post-diagnosis use

until January 2015

266 (18.5%) 90 (18.6%)

883 (61.5%)

256 (52.8%)

 Frouws et al. [7] 2017

Cohort study

Netherlands

Eindhoven Cancer Registry

British Journal of Cancer

946

Jan 1998-Dec 2011

Pre- and post-diagnosis use

NA

Unknown

Unknown

Colorectal cancer

 Chan et al. [17] 2009

Cohort study

USA

Nurses’ Health Study and the Health Professionals Follow-up Study

JAMA

1279

1980–2002

Pre- and post-diagnosis use

11.8 years

Unknown

Unknown

 Liao et all [20]. 2012

Cohort study

USA

Nurses’ Health Study and Health Professionals Follow-up Study

NEJM

964

1976-July 1st2006

Pre- and post-diagnosis use

until death or January 2011

Unknown

Unknown

 Walker et al. [20] 2012

Cohort study

UK

General Practice Research Database

British Journal of Cancer

13,994

1987–2010

Pre- and post-diagnosis use

1.7–3.1 years

Unknown

Unknown

 Domingo et al. [18] 2013

Cohort study

UK

VICTOR trial

J Clin Oncol

896

Apr 2002-Sep 2004

post-diagnosis use

NA

All patients

430 (63.1%) 62 (55.9%) 59(65.6%)7 (50%)

 McCowan et al. [19] 2013

Cohort study

Tayside, United Kingdom

Health Informatics Centre

European Journal of Cancer

2990

1st January 1997-30th December 2006

Pre- and post-diagnosis use

2.8 years

Unknown

Unknown

 Kothari et al. [21] 2015

Cohort study

Australia and USA

Moffitt Cancer Center and Royal Melbourne Hospital

Acta Oncol

1487

1996–2010

post-diagnosis use

4.5 years

All patients

Unknown

 Reimers et al. [5] 2014

Cohort study

Netherlands

Eindhoven Cancer Registry

JAMA Intern Med.

999

2002–2008

post-diagnosis use

until January 1, 2012or death

All patients

Unknown

 Cardwell et al. [16] 2014

Case-control

UK

National Cancer Data Repository

Gastroenterology

4794

1998–2007

Pre- and post-diagnosis use

7.2 years

Unknown

Unknown

 Bains et al. [6] 2016

Cohort study

Norway

Cancer Registry of Norway

J Clin Oncol

23,162

Jan 2004-Dec 2011

Pre- and post-diagnosis use

median 3.0 yearsafter CRC diagnosis

88.9% of the patients

Unknown

 Frouws et al. [7] 2017

Cohort study

Netherlands

Eindhoven Cancer Registry

British Journal of Cancer

6335

Jan 1998-Dec 2011

Pre- and post-diagnosis use

NA

Unknown

Unknown

 Newcomb et al. [14] 2017

Cohort study

USA, Canada,Australia

Four database

J Clin Oncol

2419

1997–2008

Pre- and post-diagnosis use

10.8 years

Unknown

Unknown

 Gray et al. [23] 2018

Cohort study

UK

Scottish Cancer Registry

BMC Cancer

8391

Jan 2009 - Jan2015

Pre- and post-diagnosis use

3.6 years

2167 (34.7%) 472 (22.0%)

5908 (94.7%)

2020 (94.0%)

 Joseph et al. [24] 2019

Cohort study

Hong Kong

Hong Kong

Hospital

J Gastroenterol Hepatol

3292

2004–2015

post-diagnosis use

10 years

All received surgery

Unknown

 Zell et al. [15] 2009

Cohort study

USA

California Teachers Study cohort

Cancer

621

Date of diagnosis to death or to December 31, 2005.

Pre-diagnosis use

2.8 years

26 (7%)

19 (8%)

361 (91%)

207 (92%)

 Din et al. [4] 2010

Case–control study

UK

Study of Colorectal Cancer in Scotland

Gut

4080

to 30 April 2008

Pre-diagnosis use

NA

Unknown

Unknown

 Coghill et al. [14] 2011

Cohort study

USA

Hutchinson Cancer Research Center AND SEER

Gut

1737

1997–2002

Pre-diagnosis use

8 years

Unknown

Unknown

  1. a: 947 (50.0%) /273 (55.0%) means 947 (50.0%) receive surgery in aspirin non-user patients and 273 (55.0%) receive surgery in aspirin user patients
  2. b: 720 (38.0%) /146 (29.4%) means 720 (38.0%) receive chemotherapy in aspirin non-user patients and 146 (29.4%) receive chemotherapy in aspirin user patients