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Table 1 The main characteristics of the eligible studies

From: Prognostic value of Kindlin-2 expression in patients with solid tumors: a meta-analysis

Study (Author and year)

Country

size

Tumor type

Sample type

Method (antibody data)

Negative control

Expression location

Cut-off value: (intention) or (IPS = x * y)

High expression ratio: n/N (%)

Follow-up time: mean (min–max) (mon)

Survival outcome

Conclusion (UA/MA)

Multivariate analysis

HR extraction

NOS score

Yoshida et al. 2017 (I) [14]

Japan

79

PDAC

ac (Ca)

Startle (St)

IHC (M, Merck Millipore)

NT + NP

NR

50%

Ca: 54/79 (68%)

St: 49/79 (62%)

NR

OS; RFS OS; RFS

NS; NS; NS; P

No

KM plot

8

Zhan et al. 2015 [15]

China

31

PDAC

ac

IHC (Millipore)

PBS

NR

50%

15/31 (48%)

47 (3–73)

OS

P

No

P-value

7

Mahawithitwong et al. 2013 [16]

Japan

95

PDAC

sf

IHC (R, Protein TechGroup, 1:100)

NR

NR

(4 * 3) 4/12

34/95 (64.2%)

24 (3–136); 14 (0–136)

OS; DFS

P/NS; P/−

Yes

Cox, P-value

7

Cao et al. 2015 (II) [17]

China

110

ESCC

scc

IHC (M, Origen,1:50)

NR

C + N

(3 * 4) NR

34/65 (52%)

36.5 (0–148.7)

OS; DFS

−/P; −/P

Yes

Cox

6

Cao et al. 2015 (III) [17]

China

147

ESCC

scc

IHC (M, Origen,1:50)

NR

C + N

(3 * 4) NR

20/64 (31%)

28.8 (27–72)

OS; DFS

P; P

Yes

Cox

6

Wu et al. 2017 [18]

China

203

BC

sf

IHC (M, Santa Cruz, 1:500)

PBS

NR

(3 * 4) 6/12

109/203 (54%)

64 (49–78)

OS; CSS; DFS

P/P; P/−; P/−

Yes

Cox

6

Papachristou et al. 2008 [19]

Greece etc.

60

CHS

sf

IHC (M, homemade, 1/50)

TBS

C

33%

51/60 (85%)

67.9 (40.9, 2–180)

OS

P

No

P-value

8

Ge et al. 2015 [20]

China

72

HCC

ac

IHC (R, ab152106, 1:100)

PBS

NR

(4 * 3) 4/12

43/72 (60%)

NR (17.96–43.11)

OS; DFS

P/P; P/P

Yes

Cox

7

Lin et al. 2017 [21]

China

127

HCC

ac

IHC (M, MAB2617, Billerica, 1:100)

NR

C

(3 * 4) 4/12

103/127 (81%)

22 (1–94)

OS

P/P

Yes

Cox

8

Ning et al. 2017 [22]

China

100

OSS

Sarcoma

IHC (R, Millipore, 1:150)

PBS

N

(3 * 4) 4.56/12

51/100 (51%)

29.82 (5.26–38.89)

OS; DFS

P/P; P/P

Yes

Cox

7

Ou et al. 2016 [23]

China

188

Glioma

Carcinoma

IHC (1:100)

NR

NR

4/12

132/188 (70%)

NR (0–39)

OS

P/P

Yes

Cox

8

Ren et al. 2014 [24]

China

113

sEOC

scc

IHC (R, Dako, 1:2000)

PBS

NR

(4 * 4) 12/16

91/113 (80%)

NR

OS; PFS

N/NS; N/N

Yes

KM-plot

6

Shen et al. 2012 [25]

China

40

GC

ac

WB (R, ab74030, Abcam, 1:600)

actin

NR

Ratio: K2/actin > 2

22/40 (55%)

37.1 (5–77)

OS; PFS

P/NS; P/P

Yes

Cox

8

Li et al. 2017 [26]

China

109

ccRCC

ac

IHC (M, Millipore)

NT

C

50%

70/109 (64%)

69 (0.94–82)

OS

P/NS

Yes

Cox

7

Yan et al. 2016 [27]

China

336

ccRCC

ac

IHC (M, ab117962, Abcam, 1:100)

NR

NR

(3 * 3) 4/9

199/336 (59%)

NR (10–60)

OS; DFS

−/P; −/P

Yes

Cox

7

  1. (I) This article (Yoshida [14]) was listed two cohort study because the sample types contains cancer tissue and startle cell. (II) and (III) This article (Cao [17]) included patients from generation dataset (II) and validation dataset (III). Antibody data mainly contains the species (mouse, rabbit), code, manufacturer, and concentration ratio
  2. n: number of patients; PDAC: pancreatic ductal adenocarcinoma; ESCC: esophageal squamous cell carcinoma; BC: bladder cancer; CHS: chondrosarcoma; HCC: hepatocellular carcinoma; OSS: osteosarcoma; sEOC: serous epithelial ovarian cancers; GC: gastric cancer; ccRCC: clear cell renal cell carcinoma; ac: adenocarcinoma; Ca: cancer tissue, St: startle cell; sf: stromal fibroblasts; scc: squamous cell carcinoma; IHC: immunohistochemistry; WB: Western Blot; NR: no report; NT: non-cancer tissue; NP: non-tumor patient; PBS: phosphate buffered solution; TBS: triethanolamine buffered solution; C: cytoplasm, N: cellular nucleus; IPS: immunohistochemical positive score; x: up-limit of the averaged staining intensity score; y: up-limit of the score standing for stained cells proportion; *: multiplication of the two score; Ratio: the ratio of gray value; UA: univariate analysis; MA: multivariate analysis; NS: not significant, P: positive for the conclusion that Kindlin-2 high expression is associated with poor prognostic outcome, N: negative for the conclusion; Cox: Cox proportional-hazards model; NOS: the Newcastle–Ottawa Quality Assessment Scale