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Table 1 Main characteristics of the studies examining the relationship between circulating leptin, adiponectin levels and HCC

From: The association of leptin and adiponectin with hepatocellular carcinoma risk and prognosis: a combination of traditional, survival, and dose-response meta-analysis

Author, Year, Country

Study design

Study period

the source of case group

the source of Cancer-free control group

Number

Mean age

Males

BMI

Sample source

Measured indicators

Detected method

NOS score

Abouzied, 2017, Egypt

C

–

HCC

Healthy controls

25/25

57.7/29.2

18/23

21.7/22.2

Serum

Leptin

ELISA

5

Aleksandrova, 2014, Europe

N

2000–2006

HCC

Healthy controls

125/250

60.1/60.1

85/171

28.1/26.9

Serum

Leptin and AdipoQ

ELISA

8

Ataseven, 2006, Yurkey

C

–

HBV-related HCC

HBV-related cirrhosis/ Healthy controls

22/23/25

59.8/45.5/37.1

15/11/11

–

Serum

Leptin

ELISA

8

Bakir, 2017, Egypt

S

03/2016–11/2016

HCV-related cirrhotic HCC

HCV-related cirrhosis

50/40

53.2/50.7

29/25

24.5/26.1

Serum

Leptin

ELISA

5

Bastard, 2018, France

N

03/2006–07/2016

Viral cirrhotic HCC

Viral cirrhosis

56/96

59.8/58.9

34/61

25.6/25.8

Serum

Leptin and AdipoQ

ELISA

7

Chen, CL, 2014, Taiwan

N

01/1999–12/2004

HBV-related HCC

Chronic hepatitis B

187/374

52.4/52.2

154/311

–

Plasma

Leptin and AdipoQ

ELISA

8

Chen, MJ, 2012, Taiwan

C

01/2009–12/2009

Viral HCC

Healthy controls

65/165

58.8/47.7

47/112

24.7/24.4

Serum

AdipoQ

RIA

6

Costantini,2013, Italy

C

–

HCV-related HCC

HCV-related cirrhosis / Chronic hepatitis C / Healthy controls

26/30/30/20

70.0/68/63.4/60.9

18/14/15/9

–

Serum

Leptin

ELISA

8

Feder, 2019, Germany

P

05/2012–05/2015

HCC

Healthy controls

32/49

–

–

–

Serum

AdipoQ

ELISA

7

Fukushima, 2010, Japan

P

1993–2003

HCV-related HCC

Chronic hepatitis C

9/27

53.0/51.3

5/11

–

Serum

Leptin (RIA) and HMW AdipoQ (ELISA)

8

Hamdy, 2015, Egypt

S

01/2014–12/2014

HCV-related cirrhotic HCC

HCV-related cirrhosis

61/29

52.3/52.3

51/21

33.7/36.7

Serum

AdipoQ

ELISA

8

Khattab, 2012, Egypt

C

02/2009–01/2010

HCC

Chronic hepatitis C / Healthy controls

147/147/320

43.9/41.6/42.9

114/115/201

24.9/25.1/25.3

Serum

AdipoQ

ECLI

6

Kotani, 2009, Japan

N

1990–1999

HCC

Healthy controls

59/334

63.5/62.7

–

–

Serum

AdipoQ

ELISA

5

Liu, CJ, 2009, Taiwan

S

01/2002–10/2005

HBV-related HCC

HBV-related cirrhosis / Chronic hepatitis B/ Healthy controls

120/40/120/116

50.7/50.3/30/53.8

100/29/63/67

–

Serum

AdipoQ

ELISA

8

Liu, ZW, 2005, China

C

–

HCV-related cirrhotic HCC

HCV-related cirrhosis/ Chronic hepatitis C/ Healthy controls

2/10/30/30

59.5/53.7/41/39.4

2/6/17/18

23.0/22.7/23.0/23.1

Serum

Leptin

ELISA

8

Michikawa, 2013, Japan

N

1993–2006

Viral HCC

Chronic viral hepatitis

90/117

–

62/80

–

plasma

AdipoQ

ELISA

8

Radwan, 2019, Egypt

S

–

HCC

Chronic hepatitis C

48/52

53.2/52.5

26/32

25.2/27.7

Serum

AdipoQ

ELISA

5

Sadik, 2012, Egypt

C

01/2008–02/2009

HCV-related HCC

HCV-related cirrhosis/ Healthy controls

69/36/21

59.1/53.0/55.8

43/23/13

28.0//27.1/29.1

Serum

Leptin and AdipoQ

ELISA

6

Sumie, 2011, Japan

C

01/1997–10/2007

HCV-related HCC

Chronic hepatitis C

97/97

67.4/61.2

67/67

22.5/23.1

Serum

AdipoQ

ELISA

7

Voumvouraki, 2011, Greece

C

–

Viral cirrhotic HCC

Viral cirrhosis/ Chronic hepatitis C / Healthy controls

38/34/44/60

62.0/60.0/53.0/−−

25/12/8/−−

–

Serum

Leptin

ELISA

8

Wang, 2003, Taiwan

C

01/2000–12/2000

Viral cirrhotic HCC

Viral cirrhosis/ Healthy controls

31/26/25

65.0/59.0/65.0

31/26/25

23.2/23.7/24.4

Serum

Leptin

RIA

6

  1. P Cohort, S Cross-sectional, C Case-control, N Nested Case-control, HCC Hepatocellular carcinoma, HCV hepatitis C virus, HBV hepatitis B virus, ELISA Enzyme-linked immunosorbent assay, ECLI Electro-chemiluminescence immunoassay, RIA Radioimmunoassay, HMW AdipoQ High Molecular Weight Adiponectin, BMI body mass index, NOS Newcastle-Ottawa Scale