Nodes staging score to quantify lymph nodes for examination in gastric cancer
Liping Sun1, Qiaohong Liu1, He Ren1
1Shanghai University of Medicine & Health Sciences, Shanghai.
Medicine
|September 3, 2020
Summary
Determining the number of lymph nodes for gastric cancer diagnosis is crucial. This study developed a model showing 11 nodes examined reduces missing positive nodes to under 10%, but more are needed for advanced stages.
Area of Science:
- Oncology
- Surgical Pathology
- Biostatistics
Background:
- Accurate lymph node staging is vital for gastric cancer treatment decisions.
- Current guidelines lack consensus on the optimal number of lymph nodes to examine.
- A quantitative model for the risk of missing positive lymph nodes is needed.
Purpose of the Study:
- To develop and validate a model for determining the optimal number of lymph nodes to examine for gastric cancer.
- To quantify the risk of missing positive lymph nodes based on the number examined.
- To assess the adequacy of current lymph node dissection practices.
Main Methods:
- Analysis of 13,857 gastric cancer cases from the Surveillance, Epidemiology, and End Results (SEER) database.
- Application of a beta-binomial model to assess nodal invasion status and risk.
- Correlation of nodal staging with patient survival data.
Main Results:
- Examining 11 lymph nodes reduces the probability of missing positive nodes to less than 10%.
- Recommended lymph node counts vary by tumor stage: T1 (6), T2 (19), T3 (40), T4 (66).
- Current median lymph node dissection (12 nodes) is adequate for early-stage (T1) but insufficient for T2-T3 gastric cancer.
Conclusions:
- A beta-binomial model provides a quantitative approach to optimize lymph node examination in gastric cancer surgery.
- The study highlights the inadequacy of current lymph node dissection for middle and advanced gastric cancer.
- Findings suggest revised guidelines for lymph node examination are necessary to improve staging accuracy and patient outcomes.
