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Metastasis stem cells in the blood of breast cancer patients discovered
Date:4/22/2013

Individual cancer cells that break away from the original tumor and circulate through the blood stream are considered responsible for the development of metastases. These dreaded secondary tumors are the main cause of cancer-related deaths. Circulating tumor cells (CTCs) detectable in a patient's blood are associated with a poorer prognosis. However, up until now, experimental evidence was lacking as to whether the "stem cell" of metastasis is found among CTCs.

"We were convinced that only very few of the various circulating tumor cells are capable of forming a secondary tumor in a different organ, because many patients do not develop metastases even though they have cancer cells circulating through their blood," says Prof. Andreas Trumpp, a stem cell expert. Trumpp is head of DKFZ's Division of Stem Cells and Cancer and director of the Heidelberg Institute for Stem Cell Technology and Experimental Medicine (HI-STEM) at DKFZ. "Metastasis is a complex process and cancer cells need to have very specific properties for it. Our hypothesis was that the characteristics of cancer stem cells, which are resistant to therapy and very mobile, are best suited," says Trumpp.

Irne Baccelli from Trumpp's team developed a transplantation test for experimental detection of metastasis-initiating cells. In collaboration with Prof. Andreas Schneeweiss from the National Center for Tumor Diseases (NCT) Heidelberg along with colleagues from the Institute of Tumor Biology in Hamburg and the Institute of Pathology of Heidelberg University Hospitals, the researchers analyzed the blood of more than 350 breast cancer patients. Using specific surface molecules, Baccelli isolated circulating tumor cells from the blood and directly transplanted them into the bone marrow of mice with defective immune systems. "Bone marrow is a perfect niche for tumor sells to colonize," Trumpp explains. After more than one hundred transplantations, metastases actually started forming in th
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Contact: Dr. Sibylle Kohlstädt
s.kohlstaedt@dkfz.de
Helmholtz Association of German Research Centres
Source:Eurekalert

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