Table 1. Characteristics of patients and tissues.

Variable	Explorationcohort	Secondcohort	P value(χ2 test)	Total
Gender	64	52	0.98	116
Male	59	48		107
Female	5	4		9
Race			0.076
White	58	52		58
Latino	5	0		5
Asian	1	0		1
Age			0.21*
Mean	63.2	60.44
SE	1.5	11.57
Barrett's #			0.46
+	20	14		34
−	40	38		78
Smoking †			0.002
+	14	25		39
−	50	26		76
Stage ‡			0.15
I	2	5		7
II	23	11		34
III	30	29		59
IV	5	7		12
Relapse
	20	26		46
Death
	21	44		65

*Student t-test.

^#Four cases were not available.

^†One case was not available.

^‡Four cases were not available.