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Table 3 Comparison of tumor invasion in patients with pNPC and rNPC

From: Local failure patterns for patients with nasopharyngeal carcinoma after intensity-modulated radiotherapy

Tumor invasion

Invasion in pNPC and rNPC (case)

Invasion in pNPC alone (case)

Invasion in rNPC alone (case)

No invasion in pNPC and rNPC (case)

P-value

Nasopharynx

25

7

0

0

0.008

Oropharynx

3

3

2

24

0.655

Nasal cavity

6

1

6

19

0.059

Laryngopharynx

0

0

2

30

0.157

Soft palate

0

0

3

29

0.083

Parapharyngeal space

11

13

0

8

<0.001

Longus capitis

5

9

4

14

0.052

Retropharyngeal space

6

14

1

11

0.001

Skull base

15

4

4

9

1.000

Sphenoid sinus

3

5

7

17

0.564

Ethmoid sinus

1

0

8

23

0.005

Masticator space

1

3

3

25

1.000

Cavernous sinus

2

2

3

25

0.655

Intracranial

1

0

2

29

0.157

  1. Abbreviations: pNPC primary nasopharyngeal carcinoma, rNPC recurrent nasopharyngeal carcinoma.