Table 1.

Baseline Demographics

Demographic	Lewis Ag Negative		CA 19-9				P
			< 180		≥ 180
	No.	%	No.	%	No.	%
Median age, years	60		64		63
Range	37-83		35-84		41-77
Sex							.36
Male	74	56	128	58	23	70
Female	58	44	92	41	10	30
T stage							.16
T1, T2	23	17	57	26	9	27
T3, T4	109	83	163	74	24	73
N stage							.26
N0	37	28	80	36	10	30
N1	95	72	140	64	23	70
AJCC stage							.08
I, II	101	77	143	65	23	70
III, IVA	31	23	77	35	10	30
Surgical margin							.35
R0	50	38	87	40	17	52
R1	51	39	71	32	11	33
Unknown	31	23	62	28	5	15
Tumor size, cm							.048
< 3	56	42	96	44	7	21
≥ 3	76	57	124	56	26	79

Abbreviation: AJCC, American Joint Committee on Cancer.