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Cervical cancer link to early sex as sexually transmitted infection, HPV, causes most cases

Having sex at an early age can double the risk of developing cervical cancer, a study of 20,000 women suggests.

The investigation into why poorer women have a higher risk of the disease found they tended to have sex about four years earlier than more affluent women.

Previously, it had been thought the disparity was the result of low screening uptake in poorer areas.

The International Agency for Research on Cancer findings are published in the British Journal of Cancer.

Although the difference in cervical cancer incidence between rich and poor – across the world – had been noted for many years, it was not clear why this is the case.

Especially as rates of infection with human papillomavirus (HPV) – the sexually transmitted infection linked with the vast majority of cervical cancers – seemed to be similar across all groups.

The study confirmed that the higher rates of cervical cancer were not linked to higher HPV levels.
   
But what it did reveal is that the two fold increased risk was largely explained by women from poorer backgrounds starting to have sex at a younger age.

The age at which a woman had her first baby was also an important factor. Screening was found to have some effect on the level of risk.

But the number of sexual partners a woman has and smoking did not account for any of the difference.

Study leader, Dr Silvia Franceschi, said the findings were not restricted to adolescence and the risk of cervical cancer was also higher in women who had their first sexual intercourse at 20 rather than 25 years.

“In our study, poorer women had become sexually active on average four years earlier. So they may have also been infected with HPV earlier, giving the virus more time to produce the long sequence of events that are needed for cancer development.”

Dr Lesley Walker, director of cancer information at Cancer Research UK, said the study raised some interesting questions.

“Although women can be infected by HPV at any age, infections at a very young age may be especially dangerous as they have more time to cause damage that eventually leads to cancer.

“Importantly, the results back up the need for the HPV vaccination to be given in schools at an age before they start having sex, especially among girls in deprived areas.”


So after a dozen years of nanny state sex lectures the current crop of school leavers are worse off- as are the UK taxpayers.

From:
http://news.bbc.co.uk/1/hi/health/8420690.stm

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