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Salmonella bug used as 'Trojan horse' to beat cancer

By John von Radowitz

A common food poisoning bug can act as a 'Trojan horse' to help the immune system fight cancer, scientists have discovered.

The salmonella bacteria can infiltrate tumours and flag the cancer cells up to the body's immune defences, making them a target for attack.

Cancers have evolved ways of evading the immune system and are often left alone because they are not seen as "foreign".

The salmonella strain engineered by the South Korean researchers is a million times less potent than the version of the bug that causes food poisoning.

Early animal tests have proved so successful that the team is now seeking funding for clinical trials.

In mice with bowel cancer, more than half the animals were completely cured without any side effects.

Professor Joon Haeng Rhee, from Chonnam National University Hwasun Hospital in South Korea, said: "We believe that this was turning tumour-helping immune cells, Dr Jekyll, into tumour-killing ones, Mr Hyde."

Previous studies have looked at using bacteria to carry anti-cancer drugs into tumours. This is the first time scientists have used the body's own response to salmonella to combat cancer.

Professor Kevin Harrington, from the Institute of Cancer Research, London, said: "It has been known for some time that certain types of bacteria, including strains of salmonella, are able to grow in tumours but not in normal tissues."

The research was reported in Science Translational Medicine.

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