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Table 1 Characteristics summary of the 45 eligible studies

From: Blood-based DNA methylation as biomarker for breast cancer: a systematic review

Number

First author

Year

Country

DNA source

Sample treatment

Measurement

Methylation levels available

Odds ratio estimation available

1

Widschwendter M

2008

Germany

Blood

–

Gene-specific methylation

Yes

Yes

2

Snell C

2008

Australia

Blood

–

Gene-specific methylation

Yes

No

3

Ito Y

2008

UK

Blood

–

Gene-specific methylation

Yes

Yes

4

Flanagan. JM

2009

UK

Blood

–

Gene-specific methylation

Yes

Yes

5

Choi JY

2009

USA

Blood

–

Global DNA methylation

Yes

Yes

6

Cho YH

2010

Turkey

Blood

–

Both global DNA methylation and gene-specific methylation

Yes

No

7

Hoffman AE

2010

Connecticut

Blood

–

Gene-specific methylation

No

Yes

8

Wong EM

2011

Australia

Blood

–

Gene-specific methylation

Yes

Yes

9

Iwamoto T

2011

Japan

Blood

–

Gene-specific methylation

Yes

Yes

10

Brennan K

2012

Australia, New Zealand, UK, and Europe

Blood

–

Both global DNA methylation and gene-specific methylation

Yes

Yes

11

Xu X

2012

USA

Blood

–

Global DNA methylation

Yes

Yes

12

Bosviel R

2012

France

Blood

–

Gene-specific methylation

Yes

No

13

Wu HC

2012

USA

Blood

–

Global DNA methylation

Yes

Yes

14

Delgado-Cruzata L

2012

USA

Blood

–

Global DNA methylation

Yes

Yes

15

Kitkumthorn N

2012

Thailand

Blood

–

Global DNA methylation

Yes

No

16

Hajikhan Mirzaei M

2012

Iran

Blood

–

Gene-specific methylation

Yes

No

17

Askari M

2013

India

Blood

–

Gene-specific methylation

Yes

Yes

18

Severi G

2014

Australia

Blood

–

Global DNA methylation

Yes

Yes

19

Yang RX

2014

Germany

Blood

–

Gene-specific methylation

Yes

Yes

20

Kuchiba A

2014

Japan

Blood

–

Global DNA methylation

Yes

Yes

21

Gupta S

2014

Poland

Blood

–

Gene-specific methylation

Yes

Yes

22

DeRoo LA

2014

USA

Blood

–

Global DNA methylation

No

Yes

23

van Veldhoven K

2015

Italy

Blood

–

Global DNA methylation

Yes

Yes

24

Cho YH

2015

USA

Blood

–

Gene-specific methylation

Yes

Yes

25

Yari K

2015

Iran

Blood

–

Gene-specific methylation

Yes

No

26

Harrison K

2015

Europe

Blood

–

Gene-specific methylation

Yes

Yes

27

Zmetakova I

2013

Slovakia

Blood and plasma

1000g for 10 min + 1000g for 10 min

Gene-specific methylation

Yes

No

28

Enders KN

2014

China

Blood and plasma

na

Gene-specific methylation

Yes

No

29

Hoque MO

2006

Senegal

Plasma

2200 rpm for 10–15 min

Gene-specific methylation

Yes

No

30

Papadopoulou E

2006

Greece

Plasma

2000 rpm for 10 min + 2000 rpm for 10 min

Gene-specific methylation

Yes

No

31

Yazici H

2009

USA

Plasma

na

Gene-specific methylation

Yes

No

32

Radpour R

2011

Switzerland

Plasma

16,006g for 10 min + full speed 10 min

Gene-specific methylation

Yes

No

33

Enders KO Ng

2011

China

Plasma

1600g for 10 min + 16,000g for 10 min

Gene-specific methylation

Yes

No

34

Chimonidou M

2013

Greece

Plasma

2000g for 10 min

Gene-specific methylation

Yes

No

35

Dulaimi E

2004

Pennsylvania

Serum

na

Gene-specific methylation

Yes

No

36

Martinez-Galan J

2008

Spain

Serum

2000g for 10 min

Gene-specific methylation

Yes

No

37

Van der Auwera I

2009

Belgium

Serum

2000g for 10 min

Gene-specific methylation

Yes

No

38

Chen Z

2009

China

Serum

1000g for 10 min

Gene-specific methylation

Yes

No

39

Zurita M

2010

Spain

Serum

2000g for 10 min

Gene-specific methylation

Yes

No

40

Ahmed IA

2010

Germany

Serum

2000g for 10 min

Gene-specific methylation

Yes

No

41

Brooks JD

2010

USA

Serum

na

Gene-specific methylation

Yes

No

42

Kim JH

2010

Korea

Serum

na

Gene-specific methylation

Yes

No

43

Kloten V

2013

Germany

Serum

2000g for 10 min

Gene-specific methylation

Yes

No

44

Swellam M

2015

Egypt

Serum

1600g for 15 min

Gene-specific methylation

Yes

No

45

Liu LM

2015

China

Serum

na

Gene-specific methylation

Yes

No

  1. na not available