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Published in: Breast Cancer Research 5/2009

Open Access 01-10-2009 | Research article

Comparative evaluation of cell-free tumor DNA in blood and disseminated tumor cells in bone marrow of patients with primary breast cancer

Authors: Heidi Schwarzenbach, Klaus Pantel, Birthe Kemper, Cord Beeger, Friedrich Otterbach, Rainer Kimmig, Sabine Kasimir-Bauer

Published in: Breast Cancer Research | Issue 5/2009

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Abstract

Introduction

The origin and clinical relevance of circulating cell-free tumor DNA in the blood of cancer patients is still unclear. Here we investigated whether the detection of this DNA is related to bone marrow (BM) micrometastasis and tumor recurrence in breast cancer patients.

Methods

BM aspirates of 81 primary breast cancer patients were analyzed for the presence of disseminated tumor cells (DTC) by immunocytochemistry using the pan-cytokeratin antibody A45-B/B3. PCR-based fluorescence microsatellite analysis was performed for detection of loss of heterozygosity (LOH) at 6 polymorphic markers using cell-free serum DNA. The data were correlated with established risk factors, and patients were followed-up over 6-10 years.

Results

LOH was detected in 33.5% of blood samples. The occurrence of LOH at the entire microsatellite marker set correlated with histopathology (P = 0.05) and grading (P = 0.006) of the primary tumor. The genomic region characterized by marker D9S171 was only affected by LOH in patients with increased tumor stages (pT2-4, P < 0.05) and older age (≥ 55 years, P = 0.05). Kaplan-Meier analysis showed that LOH at D3S1255 (P = 0.009) and D9S171 (P = 0.001) were significantly associated with tumor relapse. In BM, DTC were detected in 39.5% of the patients, and this finding correlated with distant metastases (P < 0.05). Patients with DTC-positive BM had higher DNA yields in their blood than patients with DTC-negative BM (P < 0.05). However, no significant correlations were found between the presence of DTC in BM and the detection of marker-specific LOH on blood DNA.

Conclusions

The detection of LOH on cell-free tumor DNA in blood is unrelated to BM micrometastasis and provides independent information on breast cancer progression.
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Metadata
Title
Comparative evaluation of cell-free tumor DNA in blood and disseminated tumor cells in bone marrow of patients with primary breast cancer
Authors
Heidi Schwarzenbach
Klaus Pantel
Birthe Kemper
Cord Beeger
Friedrich Otterbach
Rainer Kimmig
Sabine Kasimir-Bauer
Publication date
01-10-2009
Publisher
BioMed Central
Published in
Breast Cancer Research / Issue 5/2009
Electronic ISSN: 1465-542X
DOI
https://doi.org/10.1186/bcr2404

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