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Comprehensive lymph node morphometry in rectal cancer using acetone compression.

Andreas H Scheel1, Rebecca A Reineke2, Thilo Sprenger3

  • 1Institute of Pathology, University Hospital Cologne, Cologne, Germany Department of Pathology, University Medical Center Göttingen, Göttingen, Germany.

Journal of Clinical Pathology
|March 18, 2015
PubMed
Summary
This summary is machine-generated.

Acetone compression (AC) is a superior method for identifying lymph nodes (LN) in rectal cancer specimens after neoadjuvant chemoradiotherapy (neoCRT). AC retrieves more small LNs than manual dissection, aiding comprehensive pathological examination.

Keywords:
LYMPH NODESMETASTASISRECTAL CANCERSURGICAL PATHOLOGY

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Area of Science:

  • Oncology
  • Pathology
  • Surgical Pathology

Background:

  • Locally advanced rectal cancer often requires neoadjuvant chemoradiotherapy (neoCRT).
  • Accurate pathological assessment of lymph nodes (LN) is crucial for treatment response evaluation.
  • Standard manual dissection (MD) may miss small LNs, particularly after neoCRT.

Purpose of the Study:

  • To evaluate the impact of neoCRT on LN number and morphology in rectal cancer.
  • To compare the efficacy of Acetone compression (AC) with whole mesorectal embedding (WME) and MD for LN retrieval.
  • To assess AC's suitability for comprehensive pathological examination of fatty tissue.

Main Methods:

  • 320 rectal cancer specimens were analyzed for LN morphometry.
  • LNs were prepared using AC (n=138), WME (n=51), or MD (n=131).
  • 204 specimens had received neoadjuvant CRT; 8523 LNs were assessed, including 530 with metastases.

Main Results:

  • AC and WME demonstrated similar LN morphologies.
  • AC identified significantly more LNs per specimen (28) compared to MD (22).
  • AC detected more small LNs (<2 mm, 56%) than MD (25%), including 24 metastases.

Conclusions:

  • AC is a reliable technique for LN retrieval in rectal cancer specimens post-neoCRT, without altering LN morphology.
  • NeoCRT reduces LN size but not number; AC is crucial for detecting small LNs and metastases.
  • AC is more effective than MD for retrieving LNs from rectal cancer specimens after neoadjuvant therapy.