Cancer Stem Cells?? - (Jul/27/2010 )

http://www.medicinenet.com/script/main/art.asp?articlekey=112834

"Yeung and colleagues developed a new method of harvesting samples rich in cancer stem cells from bowel cancer cell lines and maintaining them in simple cell cultures in the lab. They used established cell lines, known as biological markers, to isolate the cancer stem cells, which were then collected and placed in largely standard cell culture conditions."

So from this article I understood that there are ways to do this without the fresh tumor or use of animals. Does anybody know anything more about this procedure?