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NEW YORK -- Scientists have found new evidence for a theory about why some cancers return after they ve seemingly been wiped out. Three studies in mice say tumors contain a pool of cancer stem cells that can multiply and seed the tumor s regrowth.

If that s true, scientists will need to find a way to kill those stem cells, in addition to how they attack the rest of the tumor.

Researchers have been finding signs of this stem cell idea for about a decade. The new studies by three teams of scientists take a different approach in analyzing tumors of the brain, skin and colon in mice. The work was published online Wednesday by the journals Nature and Science.

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