Table 2 Univariate and multivariate analysis for progression-free survival (PFS)

Gender

0.9699

0.6583–1.429

0.8769

Hypoxia score

1.861

1.264–2.741

0.0024*

1.646

1.043–2.597

0.032*

Grade

–

–

0.139

G1

Reference

G2

1.623

1.010–2.774

0.0283*

G3/G4

2.124

1.199–3.762

0.0089*

Stage

–

–

0.189

I

Reference

II

2.745

1.628–4.630

0.0292*

III/IV

1.911

0.5360–6.816

0.2483

Location (head vs body and tail)

0.5963

0.3738–0.9511

0.057

Residual tumor

2.289

1.444–3.628

0.0001*

1.988

1.303–3.035

0.001*