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Appropriate lymph node dissection for early gastric cancer based on lymph node metastases
C Kunisaki1, H Shimada, M Nomura
1Second Department of Surgery, Yokohama City University School of Medicine, Yokohama, Japan.
Surgery
|February 15, 2001
Summary
For early gastric cancer, lymph node dissection extent depends on tumor invasion depth. Mucosal tumors <30mm may not need dissection, while submucosal tumors require specific lymph node group removal.
Area of Science:
- Oncology
- Surgical Oncology
- Gastroenterology
Background:
- Lymph node dissection in early gastric cancer (EGC) is debated due to lower metastasis rates compared to advanced stages.
- Current extensive lymph node dissection (LND) practices may be excessive for EGC.
- Establishing appropriate LND guidelines for EGC is crucial.
Purpose of the Study:
- To identify predictive factors for lymph node metastasis in EGC.
- To map the sites and rates of lymph node metastasis based on tumor characteristics and location.
- To refine lymph node dissection strategies for EGC.
Main Methods:
- Retrospective analysis of 588 consecutive EGC patients.
- Univariate and multivariate analyses to predict lymph node metastases.
- Mapping of lymph node metastasis sites and rates by tumor location.
Main Results:
- Tumor invasion depth was a key predictor of lymph node metastasis in EGC.
- For mucosal cancer, tumor diameter was the sole predictor; metastases were limited to paragastric nodes.
- For submucosal cancer, tumor diameter, macroscopic appearance, and histology were not predictive; metastases involved group 1 and some group 2 lymph nodes.
Conclusions:
- For mucosal cancer <30mm, LND is unnecessary; for tumors ≥30mm, limited LND with local gastrectomy is suitable.
- For submucosal cancer, gastrectomy with dissection of group 1 and selected group 2 lymph nodes is sufficient.
- Tailored LND strategies based on invasion depth and tumor size can optimize treatment for EGC.