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

Table 1 Clinicopathological characteristics of all patients

Variables	Cases	Training dataset(n = 39)	Validation dataset(n = 33)	P
Sex
Male	53	28	25	0.79
Female	19	11	8
Age (yr)
mean ± SE	72	60.9 ± 1.5	61.6 ± 1.3	0.74
Depth of wall invasion
T2	4	3	1	0.121
T3	56	32	24
T4	12	4	8
Differentiation
Well	7	5	2	0.181
Moderate	31	14	17
Poor	27	18	9
Undifferentiated2	7
Lymph node metastasis
Negative	16	10	6	0.57
Positive	56	29	27
Distance metastasis
M0	66	38	28	0.09
M1	6	1	5
TNM stages
I + II	17	12	5	0.301
III	33	18	15
IV	22	9	13

¹The multiple comparisons of different subclasses;

²Data was incomplete.