Laparoscopic sentinel lymph node (SLN) versus extensive pelvic dissection for clinically localized prostate carcinoma

Area of Science:

• Urologic Oncology
• Surgical Staging
• Nuclear Medicine Imaging

Background:

• Lymph node metastasis is a critical prognostic indicator in prostate cancer (PC).
• Accurate staging of locoregional prostate cancer is essential for treatment planning.
• Sentinel lymph node (SLN) biopsy offers a minimally invasive approach to assess nodal status.

Purpose of the Study:

• To prospectively evaluate the diagnostic accuracy of laparoscopic sentinel lymph node (SLN) biopsy for staging clinically localized prostate cancer.
• To determine the effectiveness of SLN biopsy in identifying lymph node metastasis.
• To assess the feasibility of a targeted SLN resection approach.

Main Methods:

• Patients with intermediate or high risk of lymph node metastases underwent transrectal ultrasound-guided injection of (99m)Tc-sulphur rhenium colloid.
• Intraoperative detection of SLNs was performed using a laparoscopic probe, followed by resection and ex vivo counting.
• Histological analysis, including immunohistochemistry, was used to confirm metastasis in SLNs.

Main Results:

• The study included 93 prostate cancer patients; the intraoperative SLN detection rate was 93.5%.
• Lymph node metastases were found in 19 patients, with nine cases identified exclusively in SLNs.
• The false-negative rate was 10.5%, and a targeted SLN resection would have avoided significant numbers of metastatic lymph nodes compared to standard resections.

Conclusions:

• Laparoscopic SLN biopsy is effective for identifying metastasis in prostate cancer patients.
• Targeted resection of identified SLNs minimizes the need for extensive lymph node dissection.
• This approach maintains high accuracy in staging while potentially reducing surgical morbidity.