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Image of Cold sore virus 'treats skin cancer'

A genetically engineered version of a virus that normally causes cold sores shows real promise for treating skin cancer, say researchers.

The modified herpes virus is harmless to normal cells but when injected into tumours it replicates and releases substances to help fight the cancer.

Trial results published in the Journal of Clinical Oncology show the therapy could lengthen survival by years - but only for some melanoma patients.

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