Table 1.

Characteristics of patients included in this study

	Total cases	Cluster1	Cluster2	High-risk	Low-risk
Number	486	263	323	224	262
Age
≤ 60	163	132	260	61	102
> 60	323	31	63	163	160
Grade
G1	97	62	35	28	69
G2	113	86	27	32	81
G3	267	236	31	158	109
G4	9	8	1	6	3
Stage
I	307	236	71	120	187
II	46	38	8	25	21
III	108	94	14	64	44
IV	25	24	1	15	10
Radiation therapy
No	267	225	51	129	147
Yes	210	167	43	95	115
Surgical approach
Minimally invasive	195	151	44	96	99
Open	291	241	50	128	163