Table 2 Univariable Cox Proportional Hazards Regression Analyses for Overall Survival

Cohort^a

1.526

2.341

0.994

0.053

Gender

 Female

reference category

reference category

reference category

 Male

1.233

0.837

1.816

0.289

2.065

0.773

5.517

0.148

1.089

0.714

1.662

0.692

Age

1.015

0.996

1.035

0.125

0.987

0.941

1.035

0.582

1.027

1.005

1.049

0.017

Histology

0.010

0.003

0.436

 AC

reference category

reference category

reference category

 SCC

1.805

1.209

2.696

0.004

5.214

1.777

15.302

0.003

1.325

0.859

2.044

0.203

 NOS/ others

1.819

1.092

3.028

0.022

6.228

2.037

19.048

0.001

1.268

0.696

2.31

0.437

Treatment

 Surgery

reference category

reference category

Chemoradiotherapy

2.037

1.068

3.884

0.031

1.786

0.806

3.955

0.153

UICC stage

< 0.001

0.031

0.005

 IIIa

reference category

reference category

reference category

 IIIb

1.519

0.999

2.310

0.050

0.949

0.410

2.201

0.904

1.686

1.015

2.800

0.044

 IIIc

2.612

1.625

4.200

< 0.001

4.218

1.331

13.363

0.014

2.499

1.432

4.361

0.001

PET parameters

 MTV(r)

1.419

1.168

1.724

< 0.001

1.676

1.116

2.516

0.013

1.316

1.049

1.651

0.018

 MTV

1.003

1.001

1.004

< 0.001

1.004

1.001

1.007

0.011

1.002

1.000

1.004

0.014

 TLG

1.000

1.000

1.000

0.005

1.000

1.000

1.001

0.024

1.000

1.000

1.001

0.074

 SULpeak

1.011

0.972

1.051

0.592

1.073

0.99

1.163

0.084

0.989

0.944

1.035

0.632

 SUVmax

1.005

0.980

1.029

0.714

1.042

0.991

1.096

0.108

0.992

0.963

1.021

0.565

n° of lesions

1.001

0.951

1.055

0.957

1.014

0.948

1.084

0.682

1.017

0.928

1.116

0.716