Table 1.

Clinical characteristics of clear cell renal cell carcinoma patients in TCGA database.

Clinical features	Variables	Total (n = 539)	Percentages (%)
Age (year)	≤65	353	65.49
	>65	186	34.51
Gender	Female	186	34.51
	Male	353	65.49
Histological grade	G1	14	2.60
	G2	235	43.60
	G3	207	38.40
	G4	75	13.91
	Gx	5	0.93
	Unknown	3	0.56
T classification	T1	278	51.58
	T2	71	13.17
	T3	179	33.21
	T4	11	2.04
Lymph nodes	N0	241	44.71
	N1	16	2.97
	NX	282	52.32
Distant metastasis	M0	428	79.41
	M1	78	14.47
	MX	31	5.75
	Unknown	2	0.37
Clinical stage	Stage I	272	50.46
	Stage II	59	10.95
	Stage III	123	22.82
	Stage IV	82	15.21
	Unknown	3	0.56