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Published in: Breast Cancer Research 4/2014

Open Access 01-08-2014 | Research article

The dynamic range of circulating tumor DNA in metastatic breast cancer

Authors: Maryam Heidary, Martina Auer, Peter Ulz, Ellen Heitzer, Edgar Petru, Christin Gasch, Sabine Riethdorf, Oliver Mauermann, Ingrid Lafer, Gunda Pristauz, Sigurd Lax, Klaus Pantel, Jochen B Geigl, Michael R Speicher

Published in: Breast Cancer Research | Issue 4/2014

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Abstract

Introduction

The management of metastatic breast cancer needs improvement. As clinical evaluation is not very accurate in determining the progression of disease, the analysis of circulating tumor DNA (ctDNA) has evolved to a promising noninvasive marker of disease evolution. Indeed, ctDNA was reported to represent a highly sensitive biomarker of metastatic cancer disease directly reflecting tumor burden and dynamics. However, at present little is known about the dynamic range of ctDNA in patients with metastatic breast cancer.

Methods

In this study, 74 plasma DNA samples from 58 patients with metastasized breast cancer were analyzed with a microfluidic device to determine the plasma DNA size distribution and copy number changes in the plasma were identified by whole-genome sequencing (plasma-Seq). Furthermore, in an index patient we conducted whole-genome, exome, or targeted deep sequencing of the primary tumor, metastases, and circulating tumor cells (CTCs). Deep sequencing was done to accurately determine the allele fraction (AFs) of mutated DNA fragments.

Results

Although all patients had metastatic disease, plasma analyses demonstrated highly variable AFs of mutant fragments. We analyzed an index patient with more than 100,000 CTCs in detail. We first conducted whole-genome, exome, or targeted deep sequencing of four different regions from the primary tumor and three metastatic lymph node regions, which enabled us to establish the phylogenetic relationships of these lesions, which were consistent with a genetically homogeneous cancer. Subsequent analyses of 551 CTCs confirmed the genetically homogeneous cancer in three serial blood analyses. However, the AFs of ctDNA were only 2% to 3% in each analysis, neither reflecting the tumor burden nor the dynamics of this progressive disease. These results together with high-resolution plasma DNA fragment sizing suggested that differences in phagocytosis and DNA degradation mechanisms likely explain the variable occurrence of mutated DNA fragments in the blood of patients with cancer.

Conclusions

The dynamic range of ctDNA varies substantially in patients with metastatic breast cancer. This has important implications for the use of ctDNA as a predictive and prognostic biomarker.
Appendix
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Metadata
Title
The dynamic range of circulating tumor DNA in metastatic breast cancer
Authors
Maryam Heidary
Martina Auer
Peter Ulz
Ellen Heitzer
Edgar Petru
Christin Gasch
Sabine Riethdorf
Oliver Mauermann
Ingrid Lafer
Gunda Pristauz
Sigurd Lax
Klaus Pantel
Jochen B Geigl
Michael R Speicher
Publication date
01-08-2014
Publisher
BioMed Central
Published in
Breast Cancer Research / Issue 4/2014
Electronic ISSN: 1465-542X
DOI
https://doi.org/10.1186/s13058-014-0421-y

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Antibody–drug conjugates (ADCs) are novel agents that have shown promise across multiple tumor types. Explore the current landscape of ADCs in breast and lung cancer with our experts, and gain insights into the mechanism of action, key clinical trials data, existing challenges, and future directions.

Dr. Véronique Diéras
Prof. Fabrice Barlesi
Developed by: Springer Medicine