Discovery and validation of prognostic markers in gastric cancer by genome-wide expression profiling

Table 3 Association between different prognosis groups identified by the ten-gene marker and the clinicopathological characteristics

Variables	Cases	Prolonged survival(n = 12)	Poor survival(n = 21)	P
Sex
Male	14	9	5	0.070
Female	18	3	15
Age (yr)
mean ± SE	33	58.1 ± 2.2	63.5 ± 1.5	0.040
Depth of wall invasion
T2	1	1	0	0.120
T3	24	11	13
T4	8	0	8
Differentiation
Well	2	1	1	0.490
Moderate	17	8	9
Poor	9	2	7
Undifferentiated1	5
Lymph Node Metastasis
Negative	6	4	2	0.160
Positive	27	8	19
Distance metastasis
M0	28	12	16	0.080
M1	5	0	5
TNM stages
II	5	5	0	0.002
III	15	5	10
IV	13	2	11

¹Data was incomplete. P values for stage, grade and location of tumors were derived from the Pearson χ² test. P value for age was derived from the t test.