Table 1.

Patient characteristics.

	No XRT		XRT		P value
	N	%	N	%
N	11852	100	3208	100
Age
≤60	2344	20	1286	40	<0.001
>60	9508	80	1922	60
Sex
Male	7452	63	2234	70	<0.001
Female	4400	37	974	30
Race
White	7926	67	2187	68
Black	1364	12	368	11	0.284
Other	2562	22	653	20
LN dissection
<15 nodes	7731	67	1823	58
15–25 nodes	2633	23	912	29	<0.001
>25 nodes	1141	10	424	13
Grade
I	820	7	86	3
II	4213	36	919	29	<0.001
III	6583	56	2129	66
IV	236	2	74	2
Stage
IA	2207	19	31	1
IB	2717	23	503	16
II	3146	27	1183	37	<0.001
IIIA	2041	17	817	25
IIIB	395	3	212	7
IV (M0)	1346	11	462	14