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SHR Neuro Krebs Kardio Lipid

Heidary, M; Auer, M; Ulz, P; Heitzer, E; Petru, E; Gasch, C; Riethdorf, S; Mauermann, O; Lafer, I; Pristauz, G; Lax, S; Pantel, K; Geigl, JB; Speicher, MR.
The dynamic range of circulating tumor DNA in metastatic breast cancer.
Breast Cancer Res. 2014; 16(4):421-421 [OPEN ACCESS]
Web of Science PubMed PUBMED Central FullText FullText_MUG

 

Autor/innen der Med Uni Graz:
Auer Martina
Geigl Jochen Bernd
Heidary Maryam
Heitzer Ellen
Lafer Ingrid
Petru Edgar
Pristauz-Telsnigg Gunda
Speicher Michael
Ulz Peter
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Number of Figures: 4
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Abstract:
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. 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. 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. 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.
Find related publications in this database (using NLM MeSH Indexing)
Biomarkers, Tumor -
Breast Neoplasms - blood
Cluster Analysis -
Computational Biology -
DNA Copy Number Variations -
DNA, Neoplasm - blood
Exome -
Female -
Gene Frequency -
High-Throughput Nucleotide Sequencing -
Humans -
Mutation -
Neoplasm Metastasis -
Neoplastic Cells, Circulating -
Reference Values -

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