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Doctors hail gene therapy that wipes out cancer cells
Scientists have discovered a technique that could revolutionise cancer treatment.
Experts say it can kill off cancer cells without giving patients serious side-effects.
In tests, rogue cells causing cervical cancer - which kills more than 1,250 women a year in Britain - were wiped out by the therapy, which targets specific genes while leaving healthy tissue unharmed.
Doctors believe the breakthrough could transform treatments for other forms of the disease - such as lymph cancer and leukaemia - by avoiding the need for surgery, radiotherapy and chemotherapy.
It could even be used to treat Aids. Researchers at the University of York 'knocked out' aggressive genes carried in a virus linked to cervical cancer, which are thought to trigger the disease and tumour growth.
Cervical cancer is caused by the human papillomavirus (HPV) which attacks two natural tumour suppressors in the body.
The new technique, called RNA interference, works by knocking out genes within cervical cancer cells which are crucial to the virus.
The RNA - ribonucleic acid - acts as a 'messenger' molecule within cells and is crucial to their function.
The scientists have developed a way of interfering with this process in rogue genes by inserting other RNA 'messengers'.
These force cells to die and stop the disease process.
Doctors hope their experimental approach may lead to new treatments for patients within three to five years.
It could result in the development of an ointment which could be applied locally if signs of cervical cancer are detected.
Experts believe that other forms of cancer which have been linked to viral infections may also respond to RNA interference.
Professor Jo Milner, who led the research, said: 'Our work has identified a novel agent with major therapeutic potential for the treatment, and possibly also the prevention, of human cervical cancer.'
The scientists, who reported their work in the journal Oncogene, were taken by surprise by the success of the technique.
They had not expected all the cancer cells to die. Professor Milner said: 'The results are absolutely remarkable.'
She said she was 'optimistic' that the RNA interference technique could work with other cancers triggered by viruses.
'We are already looking at other tumours now,' she said.
'Several types are caused by viruses, including certain types of lymphoma and certain types of leukaemia. They should be targetable as well.'
Scientists in America are planning the world's first clinical trial of the technique.
Dr John Rossi, of the Beckman Research Institute at the City of Hope Cancer Centre in Duarte, California, aims to use RNA interference on a group of Aids patients undergoing bone-marrow transplants for lymphoma.
If it works against HIV, he believes there is a good chance it will prove successful against other incurable diseases.
'We envision within a year or two at the most, that we'll be able to do the first RNA interface testing in patients because we have the infrastructure already laid for this kind of therapeutic approach,' he said yesterday.
In Britain, the plight of women suffering cervical cancer was highlighted by Coronation Street star Amanda Barrie, whose soap character Alma Haliwell died of the disease.
Miss Barrie said yesterday: 'I am absolutely overjoyed at any advancement in cancer treatment. After the Coronation Street plot line, I feel very strongly about it.'
Elaine King, chief executive of Yorkshire Cancer Research which funded the York study, said: 'This really is encouraging news and proves once again that the research we fund really is world class.'
