Annals of Surgical Oncology

, Volume 12, Issue 6, pp 504–509 | Cite as

Sentinel Nodes Are Identifiable in Formalin-Fixed Specimens After Surgeon-Performed Ex Vivo Sentinel Lymph Node Mapping in Colorectal Cancer

  • Fraser McLean Smith
  • John Calvin Coffey
  • Nurul Mod Khasri
  • Miriam Fiona Walsh
  • Nollaig Parfrey
  • Eoin Gaffney
  • Richard Stephens
  • M. John Kennedy
  • William Kirwan
  • H. Paul Redmond



In recent years, the technique of sentinel lymph node (SLN) mapping has been applied to colorectal cancer. One aim was to ultrastage patients who were deemed node negative by routine pathologic processing but who went on to develop systemic disease. Such a group may benefit from adjuvant chemotherapy.


With fully informed consent and ethical approval, 37 patients with primary colorectal cancer and 3 patients with large adenomas were prospectively mapped. Isosulfan blue dye (1 to 2 mL) was injected around tumors within 5 to 10 minutes of resection. After gentle massage to recreate in vivo lymph flow, specimens were placed directly into formalin. During routine pathologic analysis, all nodes were bivalved, and blue-staining nodes were noted. These later underwent multilevel step sectioning with hematoxylin and eosin and cytokeratin staining.


SLNs were found in 39 of 40 patients (98% sensitivity), with an average of 4.1 SLNs per patient (range, 1–8). In 14 of 16 (88% specificity) patients with nodal metastases on routine reporting, SLN status was in accordance. Focused examination of SLNs identified occult tumor deposits in 6 (29%) of 21 node-negative patients. No metastatic cells were found in SLNs draining the three adenomas.


The ability to identify SLNs after formalin fixation increases the ease and applicability of SLN mapping in colorectal cancer. Furthermore, the sensitivity and specificity of this simple ex vivo method for establishing regional lymph node status were directly comparable to those in previously published reports.


Colorectal Sentinel node Ex vivo Micrometastasis Ultrastaging 


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Copyright information

© The Society of Surgical Oncology, Inc. 2005

Authors and Affiliations

  • Fraser McLean Smith
    • 1
  • John Calvin Coffey
    • 1
  • Nurul Mod Khasri
    • 1
  • Miriam Fiona Walsh
    • 2
  • Nollaig Parfrey
    • 1
  • Eoin Gaffney
    • 2
  • Richard Stephens
    • 2
  • M. John Kennedy
    • 2
  • William Kirwan
    • 1
  • H. Paul Redmond
    • 1
  1. 1.Departments of Academic Surgery and PathologyCork University HospitalWiltonIreland
  2. 2.Departments of Academic Surgery, Pathology, and Clinical and Molecular OncologySt James’s HospitalDublinIreland

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