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Rectal Cancer: Are 12 Lymph Nodes the Limit?
Paweł Mroczkowski1,2,3, Łukasz Dziki1, Tereza Vosikova2
1Department for General and Colorectal Surgery, Medical University of Lodz, Pl. Hallera 1, 90-647 Lodz, Poland.
Cancers
|July 14, 2023
Summary
The 12-lymph node guideline for rectal cancer surgery is controversial. This study found that factors like T-stage and neoadjuvant therapy influence lymph node yield, and more examined nodes increase the chance of finding positive nodes.
Area of Science:
- Oncology
- Surgical Pathology
- Gastrointestinal Surgery
Background:
- Lymph node dissection is critical in rectal cancer surgery.
- Current guidelines recommend a minimum of 12 lymph nodes for quality assessment, but this is debated.
Purpose of the Study:
- To investigate factors affecting lymph node yield in rectal cancer.
- To evaluate the validity of the 12-lymph node threshold.
Main Methods:
- Analysis of 20,966 rectal cancer patients undergoing low anterior resection or abdominoperineal amputation (2000-2010).
- Statistical analysis of factors influencing lymph node count and detection of positive nodes.
Main Results:
- 20.53% of men and 19.31% of women had fewer than 12 lymph nodes.
- T3 stage, female sex, risk factors, and neoadjuvant therapy significantly impacted lymph node yield.
- A proportional relationship exists between examined nodes and positive node detection; no plateau was observed.
Conclusions:
- The 12-lymph node count is a controversial quality metric for rectal cancer surgery.
- Optimal surgical technique and pathological evaluation are paramount, not solely a numerical cutoff.
- Factors beyond node count influence yield and detection of metastatic disease.
