Rare side effect of cancer therapy makes patients develop more cancers

Doctors are being warned that a lifesaving therapy may cause new tumors to form in rare cases.

In a report in the New England Journal of Medicine, researchers urged physicians to 'be on the lookout' for unusual symptoms in patients who receive .

Twenty-five people in the US out of around 30,000 have been diagnosed with secondary cancer after receiving the treatment for a separate cancer.

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