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PHILADELPHIA (CBS) – Doctors are using the most unlikely weapon to fight cancer: the polio virus.

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A modified version of the polio virus is now an immune system therapy, which is effective in treating deadly brain tumors.

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Doctors conducting a study of 61 patients say the survival rate increased to 21 percent with the treatment, from just four percent with standard care.

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The study by Duke University and the National Cancer Institute was recently published by the New England Journal of Medicine.