HPV virus really DOES increase the risk of developing throat cancer, doctors warn
- Oxford scientists looked at specific strain of virus called HPV16
- Compared blood from patients with throat cancer against healthy people
- Over a third of cancer patients carried antibodies to one of HPV 16’s key cancer-causing proteins compared to one per cent of healthy people
- Estimate that seven in 100 non-smoking women and 23 in 100 non-smoking men who carry antibodies in blood will develop cancer over next 10 years
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The HPV 16 virus (pictured) significantly increases the risk of head and neck cancer
Infection with certain strains of the HPV virus significantly increases the risk of cancers in the back of the throat, new research has found.
Researchers sought to identify how the presence of the HPV 16 virus was associated with throat cancer.
They compared blood samples from 938 patients with head and neck, oesophageal (gullet) and oropharyngeal cancers with 1599 people without the disease.
They found that more than a third of those who had oropharyngeal cancers - those at the back of the throat - also carried antibodies to one of HPV’s key cancer-causing proteins – a protein from the HPV16 virus called E6.
These antibodies could then be detected in patient’s blood even in samples taken over 10 years before the cancer was diagnosed.
In comparison, less than one per cent of people without cancer carried the antibodies in their blood.
HPV’s E6 protein disables the p53 protein which is known as the ‘guardian of the genome’ because it protects cells from DNA damage and the development of cancer.
Having antibodies against this HPV protein in the blood indicates that HPV’s cancer-causing processes have been activated before.
Cancer Research UK scientists at the University of Oxfordestimate that around seven per cent of non-smoking women and around 23 per cent of non-smoking men who carry the E6 antibody will develop oropharyngeal cancer over the next 10 years.
But patients with oropharyngeal cancers linked to having the HPV infection were more likely to survive than people whose cancers weren’t related to the infection.
British girls are offered vaccination against the two most common cancer-causing HPV types, HPV16 and HPV18. It isn't yet known whether HPV vaccination could protect against oral HPV infections, or oral cancers
Over 80 per cent of people with the HPV16 antibodies in their blood were still alive five years after diagnosis, compared to 58 per cent of people without the antibodies.
HPV is already known to increase the risk of developing cervical, vulval, anal and penile cancers.
Girls aged 12 to13 in the UK are offered vaccination against the two most common cancer-causing HPV types, HPV16 and HPV18. But it is not yet known whether HPV vaccination could protect against oral HPV infections, or oral cancers.
Michael Douglas at one point claimed that the HPV virus was responsible for his throat cancer
Dr Ruth Travis, one of the authors of the study and Cancer Research UK scientist at the University of Oxford, said: 'These striking results provide some evidence that HPV16 infection may be a significant cause of oropharyngeal cancer.'
Around 1,500 people are diagnosed with oropharyngeal cancers each year in the UK. And around 470 people die from this disease.
The HPV virus can spread through oral or genital contact.
And people who have had a number of oral sex partners have a higher risk of being infected by the virus but it is not known if this is the only way the virus can spread.
Sara Hiom, Cancer Research UK’s director of health information, said: 'HPV is an extremely common virus. About eight out of 10 people will be infected with the virus at some point in their lives. Practising safer sex may reduce the risk of getting or passing on HPV, but condoms won’t stop infections completely.
'If the HPV vaccine can also protect against oral HPV infections and cancers, then it could have a broader potential protective effect, but we don’t have enough research yet to tell us.
'At the moment we know it protects against pre-cancerous changes in the cervix, vulva, vagina and anus, as well as reducing the risk of genital warts. So it’s important to reduce inequalities, and to aim for high uptake of the vaccine.
'And more research is needed to understand more about HPV infections in the mouth – how they are spread, how easy it is for the body to get rid of them, and what happens when cancer develops – so that we can learn how to reduce the burden of HPV infection in future.
The research was published in the Journal of Clinical Oncology.
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