Should Patients with Renal Cell Carcinoma and Pathological Nodal Invasion Be Classified As Having Stage IV Disease?

Background Lymph node invasion is associated with poor outcome in patients with renal cell carcinoma (RCC). Patients and Methods Patients with RCC within a single center from 2001 to 2018 were retrospectively obtained from the Chang Gung Research Database. Patient gender, physical status, Charlson Comorbidity Index, tumor side, histology, age at diagnosis, and body mass index (BMI) were compared. The overall survival (OS) and cancer-specific survival (CSS) of each group were estimated using the Kaplan–Meier method. Log-rank tests were used to compare between the subgroups. Results and Conclusions A total of 335 patients were enrolled, of whom 76 had pT 3 N 0 M 0 , 29 had pT 1–3 N 1 M 0 , 104 had T 1–4 N 0 M 1 , and 126 had T 1–4 N 1 M 1 disease. Significant OS difference was noted between pT 3 N 0 M 0 and pT 1–3 N 1 M 0 groups with 12.08 years [95% confidence interval (CI), 8.33–15.84] versus 2.58 years (95% CI, 1.32–3.85), respectively ( P < 0.005). No significant difference was observed in OS between pT 1–3 N 1 M 0 and T 1–4 N 0 M 1 groups with 2.58 years (95% CI, 1.32–3.85) versus 2.50 years (95% CI, 1.85–3.15, P = 0.72). The OS of N 1 M 1 group was worse than that of N 0 M 1 group with 1.00 year (95% CI, 0.74–1.26) versus 2.50 years (95% CI, 1.85–3.15, P < 0.05). Similar results were also observed in CSS. In summary, we claim that RCC with lymph node (LN) invasion should be reclassified as stage IV disease in terms of survival outcome.