Radiation therapy and chemotherapy aimed at killing cancer cells may have the undesirable effect of helping to create cancer stem cells, which are thought to be particularly adept at generating new tumors and are especially resistant to treatment, researchers say.

The finding might help explain why late-stage cancers are often resistant to both radiation therapy and chemotherapy, and it could point to new strategies to fight tumors.

http://www.livescience.com/23511-cancer-treatments-create-cancer-stem-cells.html

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