Sentinel Lymph Node Procedure Leads to Upstaging of Patients with Resectable Colon Cancer: Results of the Swiss Prospective, Multicenter Study Sentinel Lymph Node Procedure in Colon Cancer
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The value of the sentinel lymph node (SLN) procedure in colon cancer patients remains a matter of debate. The objective of this prospective, multicenter trial was 3-fold: to determine the identification rate and accuracy of the SLN procedure in patients with resectable colon cancer; to evaluate the learning curve of the SLN procedure; and to assess the extent of upstaging due to the SLN procedure.
One hundred seventy-four consecutive colon cancer patients were enrolled onto this prospective trial. They underwent an intraoperative SLN procedure with isosulfan blue 1% injected peritumorally followed by open standard colon resection with oncologic lymphadenectomy. Three levels of each SLN were stained with hematoxylin and eosin (H&E) and immunostained with the pancytokeratin marker AE1/AE3 if H&E was negative.
SLN identification rate and accuracy were 89.1% and 83.9%, respectively. SLN were significantly more likely to contain tumor infiltrates than non-SLN (P < 0.001). Both SLN identification rate (P = 0.021) and the sensitivity of the procedure (P = 0.043) significantly improved with experience. The use of immunohistochemistry in SLN resulted in an upstaging of 15.4% (16 of 104) stage I and II patients considered node-negative in initial H&E analysis.
The SLN procedure for colon cancer has good identification and accuracy rates, which further improve with increasing experience. Most importantly, the SLN procedure results in upstaging of >15% of node-negative patients. The potential advantage of performing the SLN procedure appears to be particularly important in these patients because they may potentially benefit from adjuvant therapy.
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Annals of Surgical Oncology
Volume 19, Issue 6 , pp 1959-1965
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- 1. Department of Surgery, University of Basel, Basel, Switzerland
- 2. Division of Medical Oncology, Cantonal Hospital St. Gallen, St. Gallen, Switzerland
- 3. Department of Surgery, Hospital Center Biel, Biel, Switzerland
- 4. Department of Surgery, Lindenhof Hospital, Berne, Switzerland
- 5. Department of Surgery, Cantonal Hospital Olten, Olten, Switzerland
- 6. Institute of Pathology, University of Basel, Basel, Switzerland
- 7. Viollier Histopathology/Cytology, Basel, Switzerland