Table 2.

Clinical features of the low- and high-risk groups in the TCGA cohort.

Clinical parameters		Total	High risk	Low risk	P value
		530	265	265
Sex	Female	186	91	95	0.7848238
	Male	344	174	170
Age	≤65	348	176	172	0.7837531
	>65	182	89	93
Grade	G1 + G2	241	97	144	0.1655402
	G3 + G4	281	164	117
	Gx or unknown	8	4	4
Stage	Stage I + II	322	138	184	9.18E − 05
	Stage III + IV	205	124	81
	Unknown	3	3	0
T	T1	271	115	156	0.0005092
	T2 + 3 + 4	259	150	109
M	M0	420	195	225	0.0048623
	M1	78	51	27
	Mx or unknown	32	19	13
N	N0	239	119	120	0.0088965
	N1	16	14	2
	Nx	275	132	143

T, tumor; M, metastasis; N, lymph nodes. P values were obtained by Fisher's test.