Table 1.

Patient, tumor, and treatment characteristics

	All patients n=24 (%)	Photon/electron therapy n=11 (%)	Proton therapy n=13 (%)	P value
Age (years)
Median	14	15	13	0.41
Range	6–18	7–18	6–18
Follow up (months)
Median	35	92	8	<0.05
Range	2–218	2–218	2–48
Gender
Male	11 (46)	5 (45)	6 (46)	1.00
Female	13 (54)	6 (55)	7 (54)
Ethnicity
Caucasian	13 (54)	4 (36)	9 (69)
Hispanic	5 (21)	2 (18)	3 (23)	0.35
African American	4 (17)	3 (27)	1 (8)
Other	2 (8)	2 (18)	0
Tumor site
Parotid	20 (83)	9 (82)	11 (85)	1.00
Submandibular	4 (17)	2 (18)	2 (15)
Histology
Mucoepidermoid carcinoma	12 (50)	5 (45)	7 (54)
Adenoid cystic carcinoma	5 (21)	2 (18)	3 (23)
Adenocarcinoma	2 (8)	0 (0)	2 (15)	0.35
Acinic cell carcinoma	2 (8)	2 (18)	0
Pleomorphic adenoma	1 (4)	0	1 (8)
Myoepithelioma	1 (4)	1 (9)	0
Undifferentiated carcinoma	1 (4)	1 (9)	0
Tumor grade
Low/intermediate	11 (46)	5 (45)	7 (54)	0.87
High	5 (21)	3 (27)	2 (15)
Unknown	8 (33)	3 (27)	4 (31)
Tumor stage
T1–2	17 (71)	9 (82)	10 (77)	0.24
T3–4	3 (13)	0	3 (23)
Tx	2 (8)	2 (18)	0
Nodal stage
N0	17 (71)	7 (64)	10 (77)	0.66
N1	7 (29)	4 (36)	3 (23)
RT dose
Median	60	60	60	0.88
Range		54–66	56.4–66
Treatment of ipsilateral neck
Yes	12 50)	8 (73)	4 (33)	0.10
No	12 (50)	3 (27)	9 (69)
Weight change (%)
Median	−1.6	−5.3	1.2	0.13
[Range]	[−16.5] – [+8.2]	[−16.5] – [+3.1]	[−9.4] – [+8.2]