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Breast Cancer Research
Published in: Breast Cancer Research 2/2013

Open Access 01-04-2013 | Research article

Comparison of three molecular assays for the detection and molecular characterization of circulating tumor cells in breast cancer

Authors: Areti Strati, Sabine Kasimir-Bauer, Athina Markou, Cleo Parisi, Evi S Lianidou

Published in: Breast Cancer Research | Issue 2/2013

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Abstract

Introduction

Comparison studies between different analytical methodologies for circulating tumor cells (CTC) detection and molecular characterization are urgently needed, since standardization of assays is essential before their use in clinical practice.

Methods

We compared three different CTC molecular assays. To avoid discrepancies due to pre-analytical errors we used the same cDNAs throughout our study. CTC were isolated using anti-EpCAM and anti-MUC1 coated magnetic beads from 2 × 5 ml of peripheral blood of 254 early and 51 metastatic breast cancer patients and 30 healthy individuals. The same cDNAs were analyzed by: a) singleplex RT-qPCR assay for CK-19; b) multiplex RT-qPCR for CK-19, HER-2, MAGE- A3, and PBGD; and c) a commercially available molecular assay (AdnaTest BreastCancer) for GA733-2, MUC-1, HER-2 and beta-actin.

Results

In early breast cancer, CK-19 RT-qPCR, multiplex RT-qPCR and the AdnaTest, were positive for the presence of CTC in 14.2%, 22.8% and 16.5% subjects, respectively. The concordance between the AdnaTest and CK-19 RT-qPCR was 72.4% while between the AdnaTest and multiplex RT-qPCR was 64.6%. In patients with overt metastasis, CK-19 RT-qPCR, multiplex RT-qPCR and the AdnaTest were positive in 41.2%, 39.2% and 54.9% patients, respectively. The concordance between the AdnaTest and CK-19 RT-qPCR was 70.6% while between the AdnaTest and multiplex RT-qPCR was 68.6%.

Conclusions

All CTC assays gave similar results in about 70% of cases. Better agreement was found in the metastatic setting, possibly explained by the higher tumor load in this group. Discordances could be attributed to the different gene transcripts used to evaluate CTC positivity. Our results indicate the importance of CTC heterogeneity for their detection by different analytical methodologies.
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Metadata
Title
Comparison of three molecular assays for the detection and molecular characterization of circulating tumor cells in breast cancer
Authors
Areti Strati
Sabine Kasimir-Bauer
Athina Markou
Cleo Parisi
Evi S Lianidou
Publication date
01-04-2013
Publisher
BioMed Central
Published in
Breast Cancer Research / Issue 2/2013
Electronic ISSN: 1465-542X
DOI
https://doi.org/10.1186/bcr3395

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