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Published in: Journal of Gastrointestinal Surgery 1/2010

Open Access 01-01-2010 | Original Article

Preoperative Chemoradiotherapy Does Not Necessarily Reduce Lymph Node Retrieval in Rectal Cancer Specimens—Results from a Prospective Evaluation with Extensive Pathological Work-up

Authors: Thilo Sprenger, Hilka Rothe, Kia Homayounfar, Tim Beissbarth, B. Michael Ghadimi, Heinz Becker, Torsten Liersch

Published in: Journal of Gastrointestinal Surgery | Issue 1/2010

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Abstract

Purpose

Preoperative chemoradiotherapy (CRT) is supposed not only to reduce lymph node metastases but also lymph node recovery in rectal cancer specimens. The objective of this prospective study was to determine the effects of chemoradiation on mesorectal lymph node retrieval under terms of a meticulous histopathological evaluation.

Methods

Specimens from 64 consecutive patients with stage II/III rectal cancer receiving preoperative 5-FU-based CRT were investigated. All patients were treated within the German Rectal Cancer Trial CAO/ARO/AIO-04. After surgery (including quality assessed total mesorectal excision), extensive pathological diagnostics was performed with embedding and microscopic evaluation of the whole mesorectal soft tissue compartment.

Results

A total number of 2,021 lymph nodes were recovered (31.6 per specimen) within pathological work-up. There was no significant correlation between the number of retrieved nodes and patient- as well as tumor-dependent parameters. Lymph node size constantly amounted for less than 0.5 cm. Twenty patients (31.3%) had persistent nodal metastases. A considerable incidence of residual micrometastatic involvement in lymph nodes <0.3 cm (in 9.4% of all patients) was detected by extensive pathologic work-up.

Conclusion

Reliable nodal staging with high numbers of detected nodes was feasible after neoadjuvant CRT. Micrometastases frequently occur in small lymph nodes detected by microscopic evaluation.
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Metadata
Title
Preoperative Chemoradiotherapy Does Not Necessarily Reduce Lymph Node Retrieval in Rectal Cancer Specimens—Results from a Prospective Evaluation with Extensive Pathological Work-up
Authors
Thilo Sprenger
Hilka Rothe
Kia Homayounfar
Tim Beissbarth
B. Michael Ghadimi
Heinz Becker
Torsten Liersch
Publication date
01-01-2010
Publisher
Springer-Verlag
Published in
Journal of Gastrointestinal Surgery / Issue 1/2010
Print ISSN: 1091-255X
Electronic ISSN: 1873-4626
DOI
https://doi.org/10.1007/s11605-009-1057-6

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