Table 2.

Univariate analysis for local control and overall survival (OS)

Characteristics	n = 35	Local control		Overall survival
		3‐year (%)	P value	3‐year (%)	P value
Age
≧59	18	93	0.45	83	0.26
<59	17	94		93
Sex
Male	15	94	0.85	93	0.34
Female	20	92		84
Performance status
0	11	91	0.69	100	0.05
1/2	24	94		82
Histology
Adenoid cystic carcinoma	21	90	0.64	90	0.66
Olfactory neuroblastoma	5	100		100
Mucoepidermoid carcinoma	4	100		67
Adenocarcinoma	2	100		–
Others	3	100		67
Location of primary tumor
Maxillary sinus/nasal cavity	18	93	0.17	88	<0.01
Oral cavity/pharynx	9	100		100
Parotid gland	6	83		100
External auditory canal	2	–		0
Operability
Operable	15	93	0.85	80	0.14
Inoperable	20	93		95
Disease
Primary tumor	29	92	0.74	89	0.24
Postoperative recurrence	6	100		83
T stage
T2	5	100	0.08	100	0.95
T3	8	86		88
T4	22	94		85
Radiation dose
64.0 Gy (RBE)/16 fractions	32	93	0.39	100	0.47
57.6 Gy (RBE)/16 fractions	3	100		87