Experts hope the discovery will lead to a new and very cheap treatment and help boost survival rates for millions of patients with the most virulent forms of the disease, for which therapies are currently limited.

Taking vitamin C in a jab rather than swallowing it in pill form means it goes straight into the blood-stream, so the body does not flush out any excess.

Instead it turns it into hydrogen peroxide, which is lethal to tumours because it can squeeze between cancer cells and stop them growing – but does not damage healthy tissues.

Cancer charities last night welcomed the “encouraging” study and called for urgent further research.

The hopeful results published yesterday came from experiments on ovarian, pancreatic and brain cancer lab cells, and on mice with the same cancers.

In the laboratory, two hours of exposure to the vitamin significantly reduced the cells’ ability to survive. Similar results were seen when mice bearing the same kinds of tumours were injected with vitamin C.
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