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[Is sentinel lymph node mapping relevant for colon cancer?: a feasibility study]
P Lasser1, J F Côté, J C Sabourin
1Département de chirurgie carcinologique, institut Gustave-Roussy, 39, rue Camille-Desmoulins, 94805 Villejuif, France.
Annales De Chirurgie
|October 16, 2003
Summary
Sentinel lymph node (SLN) detection using blue dye successfully identified occult micrometastases in colon cancer patients. This technique enhances ultrastaging, potentially improving follow-up and adjuvant treatment strategies.
Area of Science:
- Oncology
- Surgical Pathology
Background:
- The sentinel lymph node (SLN) technique using blue dye injection for colon cancer remains controversial.
- Evaluating the feasibility and diagnostic yield of SLN detection for occult nodal micrometastases is crucial.
Purpose of the Study:
- To assess the effectiveness of the SLN technique in identifying micrometastases missed by routine examination.
- To determine the ultrastaging rate of occult nodal micrometastases in colon cancer patients.
Main Methods:
- Blue dye was injected subserously around the tumor in 30 colon cancer patients during surgery.
- The first lymph nodes to exhibit blue staining were identified as SLNs.
- SLNs underwent three examination levels, including cytokeratin immunohistochemistry if H&E was negative.
Main Results:
- SLN detection was successful in 100% of cases, with a median of 2 SLNs identified per patient.
- Ultrastaging identified micrometastases in 14% of pTxN0 cases (2 with micrometastasis, 1 with isolated tumor cells).
- The SLN was positive in five of nine patients with confirmed N+ disease.
Conclusions:
- SLN detection is a feasible and valuable technique, particularly in early-stage colon cancer without evident lymph node involvement.
- Focused examination of SLNs identified 10-20% additional ultrastaging disease in pT1-3N0M0 tumors.
- This technique has significant implications for future colon cancer follow-up and adjuvant treatment protocols.