London: Scientists have engineered a virus that can selectively target tumour cells throughout the body when injected into the blood, a breakthrough they say couldone day "truly transform" cancer therapies. In a small trial on 23 patients, the modified vaccinia virus, which is known for being used to develop a smallpox vaccine, was found attacking only tumours, leaving the healthytissue alone, the University of Ottawa researchers said. Using viruses to attack cancers is not a new concept, but they have needed to be injected directly into tumours in order to evade the immune system. The finding could one day "truly transform" cancer therapies, they said.
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