Table 3.

Clinical characteristics of patients in external cohort stratified by risk status

Characteristics	High risk (n = 17)	Low risk (n = 18)	P value
Age			0.642
≦65	6	9
>  65	9	11
Gender			0.862
Male	7	10
Female	10	8
Stage			0.021
Stage I	2	6
Stage II	4	7
Stage III	6	3
Stage IV	5	2
Grade			0.034
Grade 1–2	2	8
Grade 3	7	7
Grade 4	8	3
Risk score	5.3 + 1.7	2.5 + 1.2	< 0.001

P value for categorical variable was calculated by χ2 test or Fisher’s exact test, for continuous variable, P value was calculated by t-test