TABLE 1.

Clinical characteristics.

	IMRT	%	Conventional	%	Total
Number of patients	48		282		330
Median follow-up surviving (months)	44		66		59
Time Period						P < .001
1989-1995	0	0%	59	20.9%	59
1996-2005	0	0%	169	59.9%	169
2006-2011	48	100%	54	19.1%	102
Age						P = .237
Median (years)	65		68		68
≤65	25	52.1%	121	42.9%	146
>65	23	47.9%	161	57.1%	184
Gender						P = .028
Male	37	77.1%	250	88.7%	287
Female	11	22.9%	32	11.3%	43
T-stage						P = .462
Tis	3	6.3%	13	4.6%	16
T1	32	66.7%	212	75.2%	244
T2	13	27.1%	57	20.2%	70
T2 Subcategories
Supraglottic extension	6	12.5%	14	5.0%	20
Subglottic extension Impaired Cord	4	8.3%	31	11.0%	35
Mobility	3	6.3%	12	4.3%	15
Radiation dose						P < .001
Median dose (Gy)	63		66		66
65.25 Gy or less	47	97.9%	85	30.1%	132
66 Gy or more	1	2.1%	197	69.9%	198
Fraction size						P < .001
200 cGy or less	0	0.0%	206	73.0%	206
225 cGy	48	100.0%	77	27.3%	125
Smoking						P = .603
Yes	43	89.6%	245	86.9%	288
No	5	10.4%	37	13.1%	42

Abbreviation: Gy, Gray; IMRT, intensity-modulated radiotherapy.