The Hidden Health Risk of Cell Phones

Using a mobile phone for more than 10 years increases the risk of getting brain cancer, according to the most comprehensive study of the risks yet published.

The study -- which contradicts official pronouncements that there is no danger of getting the disease -- found that people who have had the phones for a decade or more are twice as likely to get a malignant tumour on the side of the brain where they hold the handset.

The scientists who conducted the research say using a mobile for just an hour every working day during that period is enough to increase the risk -- and that the international standard used to protect users from the radiation emitted is "not safe" and "needs to be revised."

They conclude that "caution is needed in the use of mobile phones" and believe children, who are especially vulnerable, should be discouraged from using them at all.

The study, published in the latest issue of the peer-reviewed journal Occupational Environmental Medicine, is important because it pulls together research on people who have used the phones for long enough to contract the disease.

Cancers take at least 10 years -- and normally much longer -- to develop but, as mobile phones have spread so recently and rapidly, relatively few people have been using them that long.

Official assurances that the phones are safe have been based on research that has, at best, included only a few people who have been exposed to the radiation for long enough to get the disease, and are therefore of little or no value in assessing the real risk.

Last month, Britain's largest investigation into the health risks of the technology, the £8.8m Mobile Telecommunications and Health Research (MTHR) programme -- funded by "government and industry sources" -- reported that "mobile phones have not been found to be associated with any biological or adverse health effects".

But its chairman, Professor Lawrie Challis, admitted that only a small proportion of the research had covered people who had used the phones for more than a decade. He warned: "We cannot rule out the possibility at this stage that cancer could appear in a few years' time."

He said the investigation had discovered "a very slight hint" of increased numbers of brain tumours among those exposed for more than 10 years, and called for more research.

The new study -- headed by two Swedes, Professor Lennart Hardell of the University Hospital in Orebro and Professor Kjell Hansson Mild of Umea University, who also serves on the MTHR programme's management committee -- goes some way to meeting the deficiency.

The scientists pulled together the results of the 11 studies that have so far investigated the occurrence of tumours in people who have used phones for more than a decade, drawing on research in Sweden, Denmark Finland, Japan, Germany, the United States and Britain. They found almost all had discovered an increased risk, especially on the side of the head where people listened to their handsets.

Five of the six studies of malignant gliomas, cancers of the glial cells that support and protect the nerve cells, found an increased risk. The only one that did not still found an increase in benign gliomas. Four of the five studies that looked at acoustic neuromas -- benign but often disabling tumors on the auditory nerve, which usually cause deafness -- found them. The exception was based on only two cases of the disease, but still found that long-term users had larger tumours than other people.

The scientists assembled the findings of all the studies to analyse them collectively. This revealed that people who have used their phones for a decade or more are 20 per cent more likely to contract acoustic neuromas, and 30 per cent more likely to get malignant gliomas.

The risk is even greater on the side of the head the handset is used: long-term users were twice as likely to get the gliomas, and two and a half times more likely to get the acoustic neuromas there than other people.