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Virchows Archiv

, Volume 471, Issue 1, pp 57–64 | Cite as

The association between microsatellite instability and lymph node count in colorectal cancer

  • Alexander Arnold
  • Matthias Kloor
  • Lina Jansen
  • Jenny Chang-Claude
  • Hermann Brenner
  • Moritz von Winterfeld
  • Michael Hoffmeister
  • Hendrik Bläker
Original Article

Abstract

The number of lymph nodes retrieved from colorectal cancer (CRC) resection specimens is crucial for adequate diagnosis and therapy. Previous studies indicate that in addition to the extent of surgical resection and the quality of pathological lymph node examination, non-modifiable tumour parameters like microsatellite instability (MSI) are associated with higher lymph node count. In order to study the potential influence of MSI on lymph node count, we analysed a previously MSI-typed population of CRC patients (n = 1196) to determine the relationship between MSI and the frequency with which at least 12 lymph nodes were retrieved, as well as the mean and median number of retrieved lymph nodes. MSI was associated with an increased frequency of 12-node retrieval, as well as a higher mean and median lymph node count in the overall analysis (p 0.004 and 0.001 for 12-node retrieval and lymph node count, respectively). However, when the analysis was restricted to cancers of the proximal colon, the main location of microsatellite unstable tumours (84% in our study), no association between MSI and 12-node retrieval was found. Subcategorisation by UICC stage of proximally located cancers showed a statistically significant increase in the lymph node count only in microsatellite unstable stage I tumours (p 0.010). In conclusion, our data shows that previously reported associations between MSI and higher lymph node count are mainly a consequence of the increased incidence of microsatellite unstable cancer in the proximal colon. Our finding that MSI is related to a significantly higher mean lymph node count in proximal stage I cancers may indicate that the immunogenicity of this molecular tumour type induces earlier lymph node activation.

Keywords

Colorectal cancer (CRC) Microsatellite instability (MSI) Lymph node count 

Notes

Acknowledgements

We kindly thank Jack Eaton, Institute of Pathology, Charité University Medicine Berlin for his editorial support, in the form of language editing.

Compliance with ethical standards

Research involving human participants

All patients provided written informed consent prior to participation in the study. The study was approved by the responsible ethics committee of the University of Heidelberg and the medical boards of Baden–Wuerttemberg and Rhineland–Palatinate.

Funding

This was funded by the following:

- German Research Council. Grant Numbers: BR 1704/6-1, BR 1704/6-3, BR 1704/6-4 and CH 117/1-1

- German Federal Ministry of Education and Research. Grant Number: 01KH0404 and 01ER0814

- National Center for Tumour Diseases (NCT, Heidelberg, Germany; Interdisciplinary Research Program)

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Alexander Arnold
    • 1
  • Matthias Kloor
    • 2
  • Lina Jansen
    • 3
  • Jenny Chang-Claude
    • 4
  • Hermann Brenner
    • 3
    • 5
    • 6
  • Moritz von Winterfeld
    • 7
  • Michael Hoffmeister
    • 3
  • Hendrik Bläker
    • 1
  1. 1.Institute of PathologyCharité University MedicineBerlinGermany
  2. 2.Institute of PathologyUniversity of HeidelbergHeidelbergGermany
  3. 3.Division of Clinical Epidemiology and Aging ResearchGerman Cancer Research Center (DKFZ)HeidelbergGermany
  4. 4.Division of Cancer EpidemiologyGerman Cancer Research Center (DKFZ)HeidelbergGermany
  5. 5.Division of Preventive OncologyNational Center for Tumor Diseases (NCT)HeidelbergGermany
  6. 6.German Cancer Consortium (DKTK)HeidelbergGermany
  7. 7.Institute of PathologyUniversity of CologneCologneGermany

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