Table 6 Locoregional analysis

Age

< 65

1

0.34

≧ 65

1.33

0.46–3.82

Sex

Male

1

0.58

Female

0.7

0.20–2.50

Tumor site

Non-OCC

1

0.01

1

0.009

OCC

5.29

1.41–19.8

5.24

1.51–18.2

T stage

T1‑2

1

0.44

T3‑4

0.63

0.23–1.90

N stage

N0‑1

1

0.58

N2a‑3

1.42

0.41–4.92

Extracapsular extension

No

1

0.69

Yes

1.3

0.37–4.59

Positive/closed margin

No

1

0.21

Yes

2.7

0.58–12.5

Boost irradiation

No

1

0.53

Yes

1.46

0.45–4.75

Concurrent chemotherapy

No

1

0.33

1

0.34

Yes

0.57

0.19–1.76

0.62

0.23–1.66