Table 3 Univariate and multivariate analysis of variables affecting OS

Age (>63.5 years)

1.13 (0.37-3.46)

0.823

Sex

Female

1 (reference)

Male

2.56 (0.33-19.7)

0.367

Operative method

Open

1 (reference)

Laparoscopy

1.81 (0.62-5.29)

0.277

Intent to treat

Palliative

1 (reference)

Cure

0.30 (0.10-0.93)

0.038

Synchronous metastasis

2.15 (0.68-6.73)

0.187

3.05(1.07-11.94)

0.048

Site of metastasis

Single

1 (reference)

Both

0.60 (0.07-5.07)

0.64

Adrenal + other site

1.19 (0.39-3.61)

0.754

Site of primary tumor

Other

1 (reference)

Liver

0.35 (0.05-2.51)

0.301

Stomach

0.26 (0.02-2.87)

0.277

Kidney

0.63 (0.09-4.41)

0.648

Lung

1.41 (0.34-5.75)

0.626

Previous metastasectomy

No

1 (reference)

Yes

0.04 (0–67.8)

0.397

C-reactive protein (mg/dl)

≤1.0

1 (reference)

>1

5.74 (1.24-26.5)

0.025

Albumin (g/dl)

≥3.5

1 (reference)

<3.5

1.96 (0.68-5.61)

0.2

GPS

0

1 (reference)

1 (reference)

1

3.28 (0.60-17.8)

0.168

2.54 (0.46-14.26)

0.288

2

5.33 (1.09-26.0)

0.039

6.65 (1.25-35.23)

0.026

ECOG-PS

0-1

1 (reference)

2

1.81 (0.49-6.62)

0.368