Table 1.

Patients and PBT characteristics (n = 55)

Item	Value
Age, years (median)	0–19 (5)
Sex (male/female)	35/20
Histology
Embryonal	31
Alveolar	18
Others	6
Irradiation site
Head and neck	37
Parameningeal	3
Prostate	8
Others	7
Group
I	1
II	11
III	37
IV	6
Risk group
Low	9
Intermediate	39
High	7
PBT dose, GyE
Median	50.4
Range	36.0–60.0