Table 1.

Characteristics of patients in the training and testing cohorts.

Characteristic	Training cohort (N = 87)	Testing cohort (N = 29)	p
Age (years)
>60	59	17	0.3669
<60	28	12
Gender
Female	22	7	0.9015
Male	65	22
N stage
N0	71	25	0.3854
≥N1	19	4
M stage
M0	85	27	0.2399
M1	2	2
Grade
0	64	19	0.6251
1	27	10