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BMC Cancer
Published in: BMC Cancer 1/2010

Open Access 01-12-2010 | Research article

Assessment of a six gene panel for the molecular detection of circulating tumor cells in the blood of female cancer patients

Authors: Eva Obermayr, Fatima Sanchez-Cabo, Muy-Kheng M Tea, Christian F Singer, Michael Krainer, Michael B Fischer, Jalid Sehouli, Alexander Reinthaller, Reinhard Horvat, Georg Heinze, Dan Tong, Robert Zeillinger

Published in: BMC Cancer | Issue 1/2010

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Abstract

Background

The presence of circulating tumor cells (CTC) in the peripheral blood of cancer patients has been described for various solid tumors and their clinical relevance has been shown. CTC detection based on the analysis of epithelial antigens might be hampered by the genetic heterogeneity of the primary tumor and loss of epithelial antigens. Therefore, we aimed to identify new gene markers for the PCR-based detection of CTC in female cancer patients.

Methods

Gene expression of 38 cancer cell lines (breast, ovarian, cervical and endometrial) and of 10 peripheral blood mononuclear cell (PBMC) samples from healthy female donors was measured using microarray technology (Applied Biosystems). Differentially expressed genes were identified using the maxT test and the 50% one-sided trimmed maxT-test. Confirmatory RT-qPCR was performed for 380 gene targets using the AB TaqMan® Low Density Arrays. Then, 93 gene targets were analyzed using the same RT-qPCR platform in tumor tissues of 126 patients with primary breast, ovarian or endometrial cancer. Finally, blood samples from 26 healthy women and from 125 patients (primary breast, ovarian, cervical, or endometrial cancer, and advanced breast cancer) were analyzed following OncoQuick enrichment and RNA pre-amplification. Likewise, hMAM and EpCAM gene expression was analyzed in the blood of breast and ovarian cancer patients. For each gene, a cut-off threshold value was set at three standard deviations from the mean expression level of the healthy controls to identify potential markers for CTC detection.

Results

Six genes were over-expressed in blood samples from 81% of patients with advanced and 29% of patients with primary breast cancer. EpCAM gene expression was detected in 19% and 5% of patients, respectively, whereas hMAM gene expression was observed in the advanced group (39%) only. Multimarker analysis using the new six gene panel positively identified 44% of the cervical, 64% of the endometrial and 19% of the ovarian cancer patients.

Conclusions

The panel of six genes was found superior to EpCAM and hMAM for the detection of circulating tumor cells in the blood of breast cancer, and they may serve as potential markers for CTC derived from endometrial, cervical, and ovarian cancers.
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Metadata
Title
Assessment of a six gene panel for the molecular detection of circulating tumor cells in the blood of female cancer patients
Authors
Eva Obermayr
Fatima Sanchez-Cabo
Muy-Kheng M Tea
Christian F Singer
Michael Krainer
Michael B Fischer
Jalid Sehouli
Alexander Reinthaller
Reinhard Horvat
Georg Heinze
Dan Tong
Robert Zeillinger
Publication date
01-12-2010
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2010
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/1471-2407-10-666

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