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2011-05-31 13:52:31
By James Gallagher Health reporter, BBC News
Lady on mobile phone Is there a risk of brain cancer from using a mobile phone?
The World Health Organization's cancer research agency says mobile phones are
"possibly carcinogenic".
A review of evidence suggests an increased risk of a malignant type of brain
cancer cannot be ruled out.
However, any link is not certain - they concluded that it was "not clearly
established that it does cause cancer in humans".
A cancer charity said the evidence was too weak to draw strong conclusions
from.
A group of 31 experts has been meeting in Lyon, France, to review human
evidence coming from epidemiological studies.
They said they looked at all relevant human studies of people using mobile
phones and exposure to electromagnetic fields in their workplace.
The WHO's International Agency for Research on Cancer (IARC) can give mobile
phones one of five scientific labels: carcinogenic, probably carcinogenic,
possibly carcinogenic, not classifiable or not carcinogenic.
It concluded that mobiles should be rated as "possibly carcinogenic" because of
a possible link with a type of brain cancer - glioma.
Ed Yong, head of health information at Cancer Research UK, said: "The WHO's
verdict means that there is some evidence linking mobile phones to cancer but
it is too weak to draw strong conclusions from.
What else is labelled possibly carcinogenic?
"The vast majority of existing studies have not found a link between phones and
cancer, and if such a link exists, it is unlikely to be a large one.
"The risk of brain cancer is similar in people who use mobile phones compared
to those who don't, and rates of this cancer have not gone up in recent years
despite a dramatic rise in phone use during the 1980s.
"However, not enough is known to totally rule out a risk, and there has been
very little research on the long-term effects of using phones."
The WHO estimated that there are five billion mobile phone subscriptions
globally.
Christopher Wild, director of the IARC, said: "Given the potential consequences
for public health of this classification and findings it is important that
additional research be conducted into the long term, heavy use of mobile
phones.
"Pending the availability of such information, it is important to take
pragmatic measures to reduce exposure such as hands free devices or texting."