Table 1. Patients' characteristics.

Median age (range) years	59.5 (28–83)
Male/female	50/25
Histological type
Oncocytoma	2
Malignant tumours
Clear cell	64
Papillary	4
Chromophobe	3
Unclassified RCC	3
pT stage
1a	34
1b	19
2	7
3a (including one adrenal involvement)	10
3b	4
Grade
1	27
2	43
3	4

Abbreviation: RCC=renal cell carcinoma.