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Sentinel Node Mapping for Colorectal Cancer With Radioactive Tracer

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Diseases of the Colon & Rectum

Abstract

PURPOSE: The aim of this study was to test the feasibility and accuracy of radioactivity-guided mapping of the first lymph nodes found in draining the primary tumor site for colorectal cancer. METHODS: We enrolled 56 consecutive patients with preoperative diagnosis of curatively resectable colorectal cancer. Endoscopic injection of technetium Tc 99m–labeled tin colloid (15 MBq) was performed preoperatively, and radioactive sentinel nodes were identified intraoperatively with a gamma probe. Standard radical resection with lymph node dissection was performed in all patients, and all resected nodes were evaluated by routine histopathologic examination. RESULTS: Radioactivity-guided methods were used to detect sentinel nodes in 51 (91 percent) of 56 patients. The number of lymph nodes resected was 23.9 ± 15.2 per case. The number of sentinel nodes was 3.5 ± 2.1 (range, 0–8) per case. In 18 of 22 patients with lymph node metastasis, the sentinel node was positive. The incidence of metastasis in the sentinel node (22 percent) was significantly higher than that in nonsentinel nodes (3 percent, P < 0.01). Diagnostic accuracy according to sentinel node status was 92 percent (47/51). Four false-negative cases in this study were advanced cases with T3 primary tumors. The detection rate and diagnostic accuracy for patients with T1 or T2 primary tumors (29 cases) were 100 percent each. CONCLUSION: Intraoperative radioactivity-guided sentinel node mapping was accurate for patients with colorectal cancer with T1 or T2 tumors. The results suggest that sentinel node mapping and intraoperative biopsy may be a sensitive and specific diagnostic method for detecting metastasis in regional lymph nodes in patients with colorectal cancer.

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Authors and Affiliations

  1. Departments of Surgery, Radiology, and Pathology, Keio University, Tokyo, Japan

    Yuko Kitagawa M.D., Masahiko Watanabe M.D., Hirotoshi Hasegawa M.D., Seiichiro Yamamoto M.D., Hirofumi Fujii M.D., Kentaro Yamamoto M.D., Jun-ichi Matsuda M.D., Makio Mukai M.D., Atsushi Kubo M.D. & Masaki Kitajima M.D.

Authors
  1. Yuko Kitagawa M.D.
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  2. Masahiko Watanabe M.D.
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  3. Hirotoshi Hasegawa M.D.
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  4. Seiichiro Yamamoto M.D.
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  5. Hirofumi Fujii M.D.
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  6. Kentaro Yamamoto M.D.
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  7. Jun-ichi Matsuda M.D.
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  8. Makio Mukai M.D.
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  9. Atsushi Kubo M.D.
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  10. Masaki Kitajima M.D.
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Kitagawa, Y., Watanabe, M., Hasegawa, H. et al. Sentinel Node Mapping for Colorectal Cancer With Radioactive Tracer. Dis Colon Rectum 45, 1476–1480 (2002). https://doi.org/10.1007/s10350-004-6453-0

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  • DOI: https://doi.org/10.1007/s10350-004-6453-0

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