International Journal of Colorectal Disease

, Volume 20, Issue 2, pp 137–146

Molecular detection of clinical colorectal cancer metastasis: how should multiple markers be put to use?

  • Michael Conzelmann
  • Ulrich Linnemann
  • Martin R. Berger
Original Article

Abstract

Background and aims

Up to 45% of colorectal cancer (CRC) patients will develop local recurrence or metastasis following curative resection. The latter is due to cells shed from the primary carcinoma prior to or during surgery. The aim of this study was to contribute toward a “rational”-approach for detecting these disseminated tumor cells (DTC) using a combination of independent markers and detection methods.

Patients/methods

Liver, lymph node, and bone marrow samples from 246 CRC patients were screened for DTC using three markers: mutated K-ras was detected by polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP), and cytokeratin 20 (CK20) and guanylylcyclase C (GCC), indicating circulating epithelial cells, were tracked by nested reverse-transcription (RT) PCR.

Results

The rate of positive findings of the individual markers (CK20: 88%; GCC: 88%; K-ras: 67%) and their combinations (88–50%) was significantly higher in biopsies from liver metastases than in liver samples from patients without evident distant metastasis (M0; p<0.03). The detection rate of individual markers (except GCC) was also significantly elevated in inconspicuous liver tissue adjacent to metastasis compared with specimens from M0 patients. When using the concomitant detection of all three markers as criterion for DTC in the liver of M0 patients, however, no patient was DTC-positive. Therefore, the concomitant presence of the two CEC markers (CK20 plus GCC) and/or the presence of mutated K-ras were preferred for a combined evaluation, which resulted in a 24% detection rate for biopsies from both liver lobes. This translates into 39% of M0 patients with at least one positive liver biopsy.

Conclusion

Our results suggest that the concomitant detection of CK20 plus GCC and/or the presence of mutated K-ras are a rational approach for tracking CEC/DTC in CRC patients.

Keywords

Cytokeratin 20 Guanylylcyclase C K-ras Disseminated tumor cells Circulating epithelial cells 

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Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Michael Conzelmann
    • 1
  • Ulrich Linnemann
    • 2
  • Martin R. Berger
    • 1
  1. 1.Unit of Toxicology and ChemotherapyGerman Cancer Research CenterHeidelbergGermany
  2. 2.Department of Visceral, Thoracic and Endocrine SurgeryMunicipal Hospital Nürnberg NordNürnbergGermany

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