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Strong evidence supports prognostic value of circulating tumor cells in breast cancer
Date:5/5/2011

French researchers have reported the strongest proof yet that evidence of 'circulating tumor cells' found in samples of a patient's blood is strongly linked to poor outcomes such as a short time to disease progression.

At the IMPAKT Breast Cancer Conference in Brussels, Dr Franois-Clement Bidard and colleagues from Institut Curie in Paris say their new findings set the scene for interventional trials designed to see if improved outcomes can be achieved by modifying treatment based on circulating tumor cell counts.

"We needed to do this study to confirm data provided by earlier small studies," Dr Bidard said. "Now we are certain that circulating tumor cells (CTC) are prognostic at baseline, and that CTC changes under treatment may be an early indicator of chemotherapy efficiency."

"In metastatic breast cancer, it is time now for interventional randomized trials which will try to demonstrate that CTC-based strategies of treatment lead to a better clinical outcome, or at least to a benefit in the cost/efficacy ratio of treatment," Dr Bidard said.

The French team conducted a prospective study in 267 patients who were receiving first-line chemotherapy for metastatic breast cancer. For each patient they performed a count of circulating tumor cells, plus an analysis of other blood markers, in 7.5ml of blood. They took their measurements at the beginning of treatment and at several later time points.

Of 260 patients who were evaluable for CTC levels at baseline, 170 (65%) had at least one circulating tumor cell per 7.5 ml blood sample, and 115 (44%) had five or more, the researchers found.

At the end of the study, a multivariate analysis of their results showed that several factors, including CTC counts, were correlated with disease progression and overall survival.

"This is the first study that has been prospectively designed and statistically powered for reporting CTC-associated outcome as primary end
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Contact: Vanessa Pavinato
media@esmo.org
European Society for Medical Oncology
Source:Eurekalert

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