Table 1. Clinical features of patients in TCGA dataset and three confirmation cohorts.

Variable	TCGA set (N=288)	E-GEOD-17538 (N=232)	E-GEOD-39582 (N=558)	E-GEOD-28722 (N=125)
Gender (male/female)	157/131	122/110	308/250	–
Age (years, mean ± SD)	65.46 ± 13.26	64.73 ± 13.43	66.81 ± 13.32	65.33 ± 12.95
OS (years, mean ± SD)	2.61 ± 2.42	3.95 ± 2.56	–	5.39 ± 3.53
OS status (alive/dead)	219/69	139/93	–	55/70
DFS (years, mean ± SD)	203/62	3.65 ± 2.86	4.06 ± 3.37	4.98 ± 3.76
DFS status (0/1)	2.40 ± 2.31	145/55	380/177	92/33
Tumor stage (I/II/III/IV)	44/112/82/40	28/72/76/56	32/261/201/60	23/64/31/5

Abbreviations: DFS, disease-free survival; OS, overall survival; TCGA, The Cancer Genome Atlas.