Table III.

Univariate and multivariate analysis of various potential prognostic factors for overall survival.

	Univariate analysis		Multivariate analysis
Characteristics	No. of patients	OS, 1-year rate (%)	P-value	P-value
Age, years
<60	48	42
≥60	50	28	0.23	n.s.
Sex
Male	65	33
Female	33	33	0.66	n.s.
Performance status
0–1	56	46
2–3	42	19	0.003	0.03
RT technique
IMRT/SBRT	83	41
3D-CRT	15	0	0.08	n.s.
BED10
<60 Gy10	39	26
≥60 Gy10	59	41	0.29	n.s.
Interval between two RT
<1-year	44	14
≥1-year	54	50	<0.0001	<0.0001

RT, radiation therapy; IMRT, intensity-modulated radiotherapy; SBRT, stereotactic body radiotherapy; 3D-CRT, three-dimensional conformal radiotherapy; BED10, biological effective dose in Gy for α/β value of 10 Gy; OS, overall survival; n.s., not statistically significant.