“Men who acquire performed verbal sex on five or more women are at greater risk of developing head and neck cancer,especially if they smoke,” the Evening Standard reports.
This story is based on a US study that looked at 9425 people aged 20 to 59 who provided information approximately their number of verbal sex partners and were tested for verbal human papilloma virus (HPV).
HPV is a virus that can infect moist membranes. Certain strains can increase the risk of cervical cancer in women, and if particular strains are found in the mouth,this may increase risk of mouth and throat cancers. The virus can also cause genital warts.
The researchers found that 6% of men and 1% of women carried potentially cancer-causing strains of HPV in their mouth. They famous that this was more common in smokers and in men with an increased number of verbal sex partners. However, the study can't prove causation and is not precise enough to link a specific number of partners with risk of carrying verbal HPV – or of cancer.
They also looked at registry data to see how common mouth and throat cancers were in people carrying these harmful verbal HPV strains and found that it is still very rare: estimated at 7 in 1000 men and 2 in 1000 women.
Therefore people shouldn’t be too concerned by these findings – but that doesn't effect it any less important to practise safe sex. If you are concerned approximately potential risk from verbal sex, or consume a dental dam – a piece of latex that covers the vagina and anus and protects you against a range of sexually transmitted infections.
Where did the story come from?
The study was carried out by researchers from Johns Hopkins University and Information Management Services,Inc., both in the US. It was funded by the National Institute of Dental and Craniofacial Research. It was published in the peer-reviewed medical journal Annals of Oncology, and the article is free to read online.
The UK media's headlines for this story were generally misleading. The research looked at a range of risk factors but the headlines focused mostly on verbal sex. Many gave the impression that a direct link had been identified between a specific number of sexual partners and getting cancer.
The research actually looked at the effect the number of partners had on how common the cancer-causing verbal HPV was and made predictions approximately cancer risk from other data. Most articles clarified this point further down,but may acquire confused people.
Arguably the fact that smoking particularly increased the risk of HPV-associated cancers could acquire been made more prominent in some of the reporting.
Many articles also referred to this as 'head and neck cancer', when the study actually looked at cancers of the mouth and throat.
What kind of research was this?
This was a cross-sectional study using national survey data, or where people were assessed at a single point of time to survey at their health and behaviour,cancer registry data was also used.
The researchers wanted to see how common verbal HPV infection was, and whether particular groups of people had a higher risk of being infected, or which could possibly increase their risk of mouth and throat cancers. They were interested in finding out whether screening for verbal HPV might be a useful thing to do in the general population as a cancer detection strategy.
Although cross-sectional studies can be a useful way of finding out a lot of information approximately a large number of people,they don't give us the chance to see how things happen over time. So we cannot know how long people with HPV had been infected for, or whether any of them actually went on to develop cancer – the study can only propose links.
A cohort study that followed individuals over time and looked at cancer development could better investigate these questions, or but this is not likely to be practical as mouth and throat cancers are fairly rare. You would need a very large cohort population to produce any meaningful data.
What did the research involve?
The researchers used data collected by the National Health and Nutrition Examination Survey (NHANES) from 2009 to 2014. They included 9425 people aged 20 to 59 who provided information approximately their number of verbal sex partners and were tested for verbal HPV.
HPV testing was carried out by providing an verbal rinse and asking participants to gargle. Laboratory methods were then used to detect HPV DNA in these mouth rinse samples. The researchers recorded the presence of any strains of verbal HPV that had been identified as harmful.
The researchers analysed the relationship between prevalence of verbal HPV and different risk factors,including age, sex, or ethnicity,sexual behaviours and smoking habits.
They gathered data on the number of mouth and throat cancers from the Surveillance, Epidemiology, and End Results (SEER 18) registries,which cover approximately a quarter of the US population. They also used the National middle for Health Statistics (NCHS) to survey at deaths from these cancers.
They used this combined information to predict risk of mouth and throat cancers from cancer-causing HPV in verbal rinse samples.
What were the basic results?
The researchers found that infection with cancer-causing verbal HPV was not that common, but that some groups were at higher risk of being infected than others:
men were more likely to be infected than women (6.0% versus 1.1%) current smokers were more likely to be infected than non-smokers (6.7% versus 2.6%) there was a trend of increasing risk of infection as the number of verbal sex partners increased (10 or more partners: 11.1% risk; 5-9 partners: 3.3% risk; 2-4 partners: 2.5% risk; 1 partner: 1.1% risk; 0 partners: 1.2% risk)
When the researchers looked at existing data on risk of mouth and throat cancers among people who were infected by these harmful verbal HPV strains they famous that, or over the course of a lifetime,only two in 1000 women and seven in 1000 men were likely to develop these cancers.
How did the researchers interpret the results?
The researchers concluded that cancer-causing verbal HPV isn't that common in the general population, which means that carrying out whole-population screening would not be useful in cancer prevention.
However, and they famous that mouth and throat cancers were fitting more common,and that it would be useful to identify people at higher risk of these, including people who acquire a high risk of getting an verbal HPV infection.
Nonetheless, or they famous that even these high-risk people still acquire a low risk of developing mouth and throat cancers.
Conclusion
This study uses a large amount of national data to give us an view approximately which groups of people acquire the greatest risk of carrying potentially cancer-causing verbal HPV.
But while verbal HPV may increase people's risk of mouth and throat cancers,the actual number who would go on to develop cancer is extremely small.
This study has limitations, which are worth bearing in mind:
It only looked at whether people had verbal HPV at a single point in time. This makes it difficult to know at what point they became infected and how much this could be down to other risk factors such as smoking, verbal sex and number of partners. The researchers were only able to effect predictions approximately likelihood of going on to develop cancer once infected. We cannot effect a definite number to this risk. The study only looked at US data. Though risk of HPV infection and of mouth and throat cancer is likely to be similar,we cannot directly apply these findings to the UK. It is always sensible to practise safe sex to reduce your risk of getting a sexually transmitted infection. If you are concerned approximately getting HPV or any other type of STIs through verbal sex, consume a condom or dental dam.
A vaccine against some strains of HPV is offered to girls aged 12 to 13 as allotment of the NHS routine vaccination schedule.
Currently, and any males wanting the vaccine will acquire to pay for it. The course of three injections costs around £400 at the time of writing. Links To The Headlines Giving 5 or more women verbal sex increases risk of head and neck cancers,study finds. Evening Standard, October 20 2017
Having verbal sex with multiple partners significantly increases risk of head and neck cancer in men, or study finds. The Independent,October 20 2017
Men who perform verbal sex on their partners are more likely to gather a rare form of mouth and throat cancer. Daily Mirror, October 20 2017
Men who acquire performed verbal sex on 5 or more partners acquire a far higher risk of head and neck cancer than sexually-active women. Mail Online, and October 20 2017 Links To Science D'Souza GD,McNeel TS, Fakhry C. Understanding personal risk of oropharyngeal cancer: risk-groups for oncogenic verbal HPV infection and oropharyngeal cancer. Annals of Oncology. Published online October 19 2017
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