Three-tiered nodal classification system for bladder cancer: a new proposal

Area of Science:

• Uro-oncology
• Surgical oncology
• Cancer staging and prognosis

Background:

• Accurate prognostic stratification is crucial for managing urothelial cancer patients with positive lymph nodes (LNs).
• Existing staging systems may not fully capture prognostic differences within nodal involvement categories.

Purpose of the Study:

• To evaluate a novel three-tiered prognostic stratification system based on the number of positive lymph nodes (LNs): one, two to five, and greater than five.
• To assess the performance of this nodal staging system across varying pelvic lymph node dissection (PLND) templates and adjuvant chemotherapy statuses.

Main Methods:

• Retrospective analysis of 244 patients with positive LN urothelial cancer undergoing radical cystectomy and PLND (2000-2011).
• Survival analyses using Kaplan-Meier and log rank tests.
• Multivariable Cox proportional hazards models to confirm prognostic stratification.

Main Results:

• The three-tiered nodal classification (one, 2-5, >5 positive LNs) demonstrated significant differences in 5-year recurrence-free survival (48.6%, 34.5%, 15.9%) and overall survival (43.0%, 22.1%, 11.3%).
• This stratification remained valid irrespective of PLND template (standard vs. extended) and adjuvant chemotherapy.
• Multivariable models confirmed the independent prognostic value of this nodal system.

Conclusions:

• A three-tiered nodal classification system based on the number of metastatic LNs (one, two to five, >five) effectively stratifies patients with lymphatic disease into distinct prognostic groups.
• This system provides a refined prognostic tool for urothelial cancer patients with lymph node metastasis.