TABLE 1.

Baseline clinical characteristics of four databases.

Variables	Number
	TCGA	GSE13507	GSE32548	GSE48075
Total	408	165	131	131
Age
<60	87	42	26	32
≥60	321	123	105	99
Gender
Female	107	30	31	32
Male	301	135	100	99
Grade	10 cases missing		G1+G2 deemed as low grade
Low Grade	20	105	56	33
High Grade	378	60	75	98
AJCC-stage	2 cases missing	Calculated by 8th AJCC		Calculated by 8th AJCC
0a	0	23	NA	32
0is	0	0	NA	1
I	2	80	NA	27
II	130	26	NA	12
III	140	29	NA	41
IV	134	7	NA	18
T	34 cases missing
Tis	0	0	0	1
Ta	0	23	40	35
T1	3	81	53	28
T2	119	31	T2+T3+T4 = 38	24
T3	194	19		32
T4	58	11		11
N	42 cases missing
N0	237	149	NA	106
N1	46	9	NA	20
N2	75	6	NA	5
N3	8	1	NA	0
M	201 cases missing
M0	196	158	NA	120
M1	11	7	NA	11

NA: not applicable.