The spread of cancer or metastasis is thought to be caused by individual cancer cells that break away from the original tumor and circulate through the blood stream. 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. ...
via Medindia Health News
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