Demographic and clinicopathological characteristics of patients included in the study.

1When no clinical (N0) or pathological (pN0) lymph node metastases were noticed the lymph node status was considered as pN0/N0.2Patients with a time to progression of ≤3 months, distant metastases (M1) or unknown M stage at nephrectomy have been excluded from analysis of progression-free survival.