Table 1 Clinical and treatment characteristics

 Male

27

 Female

24

 Median

68

 Range

31–84

 Primary

38

 Recurrent

13

 Tongue

9

 Maxillary gingiva

6

 Mandibular gingiva

17

 Buccal mucosa

2

 Soft palate

1

 Floor of the mouth

6

 Occult cervical lymph node metastasis

10

 Tx

10

 T1

0

 T2

16

 T3

9

 T4

16

 N0

13

 N1

15

 N2a

2

 N2b

17

 N2c

4

 N3

0

 EXL-15SP

43

 Clinac iX

8

 Hemineck

12

 Whole neck

39

 Median (range)

30 (22–36) Gy

  < 30 Gy

20

  ≥ 30 Gy

31

 None

6

 Ipsilateral neck

29

 Bilateral neck

16