“Characteristics of Patients and Tumors”

“Radiation Group

(n = 23)”

“Chemoradiation Group

(n = 25)”

p-value

Sex

Female

10

17

0.793

Male

13

8

Age

Age, Mean

51

46

0.275

Primary site

Parotid gland

12

19

0.394

Submandibular gland

4

1

Sublingual gland

0

0

Minor salivary gland

7

5

T stage

T1

2

1

0.099

T2

7

10

T3

10

10

T4

4

4

N stage

Node negative

18

21

0.332

Node positive

5

4

Tumor stage

II

8

8

0.103

III

9

12

IV a

6

5

Histologic type

Mucoepidermoid carcinoma

6

5

0.22

Salivary duct carcinoma

0

3

myoepithelial carcinoma

0

1

Adenoid cystic carcinoma

14

14

Adenocarcinoma

2

3

High-risk features

Positive surgical margin

12

15

0.32

Close surgical margin

6

7

Negative margin

Perineural invasion

14

16

0.147

High-grade Histologic characteristics

12

13

0.09

Any of the above

23

25