Role of lymph node dissection in radical cystectomy

Area of Science:

• Urology
• Oncology
• Surgical Pathology

Background:

• The number of lymph node dissections (LNDs) is a critical prognostic factor for bladder cancer (BCa) patients after radical resection (RC).
• Understanding the association between LND quantity and patient survival is crucial for optimizing treatment strategies.

Purpose of the Study:

• To investigate the relationship between the number of lymph node dissections (LNDs) and the overall survival (OS) of bladder cancer (BCa) patients.
• To compare this association in patients who underwent radical resection (RC) in the United States and China.

Main Methods:

• Retrospective analysis of 17,730 American patients from the SEER database and 158 Chinese patients from Shanghai Tenth People's Hospital.
• Kaplan-Meier curves and Chi-squared tests were used to assess overall survival (OS).
• Cox regression analysis was employed to determine the independent effect of LND number on OS.

Main Results:

• A higher number of LNDs was significantly associated with improved OS in both American (HR=0.62) and Chinese (HR=0.27) BCa patients.
• Patients with positive lymph node metastasis (N+) generally had a higher number of LNDs compared to node-negative (N0) patients.
• The median number of LNDs varied between the US (11.0 for N0, 14.0 for N+) and China (5.0 for N0, 5.0 for N+).

Conclusions:

• The number of lymph node dissections (LNDs) is an independent predictor of survival in bladder cancer (BCa) patients undergoing radical resection (RC).
• Increasing the extent of LNDs appears to improve overall survival (OS) for BCa patients, regardless of lymph node metastasis status.
• Performing more extensive LNDs may be a vital component in the management of bladder cancer.