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Methylene blue-assisted lymph node dissection in colon specimens: a prospective, randomized study
Bruno Märkl1, Therese G Kerwel, Hendrik G Jähnig
1Institute of Pathology, Klinikum Augsburg, Augsburg, Germany.
American Journal of Clinical Pathology
|November 21, 2008
Summary
Intra-arterial methylene blue injection significantly improves lymph node (LN) harvest in colon cancer surgery. This technique enhances LN detection and reduces inadequate harvests, aiding accurate cancer staging.
Area of Science:
- Surgical Oncology
- Pathology
- Medical Imaging
Background:
- Accurate lymph node (LN) harvest is crucial for precise staging in colon cancer.
- Previous methods for enhancing LN retrieval have limitations.
- Ex vivo intra-arterial methylene blue injection was previously explored for rectal cancer.
Purpose of the Study:
- To adapt and evaluate the efficacy of ex vivo intra-arterial methylene blue injection for improving lymph node harvest in colon cancer.
- To compare the number of harvested lymph nodes and the rate of insufficient harvest between methylene blue-stained and unstained groups.
- To assess the impact of methylene blue staining on cancer upstaging and dissection efficiency.
Main Methods:
- A prospective study involving 60 colon cancer cases.
- Adaptation of ex vivo intra-arterial methylene blue injection to various colon segments.
- Comparison of primary and secondary lymph node dissection yields between stained and unstained groups.
- Analysis of insufficient lymph node harvest rates, upstaging, and time per lymph node harvested.
Main Results:
- The methylene blue-stained group had a significantly higher mean primary lymph node harvest (35 +/- 18 LNs) compared to the unstained group (17 +/- 10 LNs).
- Insufficient lymph node harvest occurred in only 1 case in the stained group versus 8 cases in the unstained group (P = .0226).
- Cancer upstaging after secondary dissection was exclusively observed in the unstained group. The time/LN ratio was significantly better in the stained group (0.6 min/LN vs. 0.9 min/LN).
Conclusions:
- Ex vivo intra-arterial methylene blue injection is a highly effective technique for improving lymph node harvest in colon cancer.
- Routine use of this method is recommended to enhance the accuracy of histopathologic assessment and cancer staging.
- The technique offers benefits in terms of increased lymph node yield, reduced insufficient harvests, and improved dissection efficiency.
