From the Telegraph:

A large study of mobile phone users has found no evidence that longer-term users are at an increased risk of developing brain tumours.

However, the Danish study, published in the journal BMJ Open, has been criticised as being “worthless” by fellow academics who say its methods are “seriously flawed”.

The team from the Institute of Cancer Epidemiology in Copenhagen looked at over 350,000 people who subscribed to mobile phone contracts before 1996, comparing brain tumour rates in them with non-subscribers. They looked for new diagnoses of brain tumours between 1990 and 2007.

The team concluded: “There was no association between tumours of the central nervous system or brain and long term (10 years or more) use of mobile phones.”

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But others strongly disagree.

Denis Henshaw, emeritus professor of human radiation effects at Bristol University, said the researchers had wrongly classified the 88 per cent of the Danish population who started using a mobile phone since 1996 – for whom there is no subscription information for legal reasons – as non-users.

They also removed business users from the study, who are likely to have been the heaviest users.

He concluded: “I consider the claims in the study to be worthless. This seriously flawed study misleads the public and decision makers about the safety of mobile phone use.”

Critics of such studies also point out that brain tumours tend to take decades, not years, to develop.