Though it’s not yet proved that cellphones cause brain cancer, a new study has claimed that long-term use of mobiles could up the risk of brain tumours.

Researchers have based their findings on an analysis of the key 23 studies that have investigated the effects of the phone — the study involved more than 12,000 patients who had developed brain tumours and 25,000 who hadn’t.

The study concluded mobile phone use of 10 years or longer was associated with an increased risk of tumours of up to 34 per cent, the ‘Sunday Express’ reported.

Radiation expert Dr George Carlo, who led the biggest industry-funded research project into cellphone use and brain cancer, was quoted as saying: “This information confirms our fears, giving serious concern for us and future generations.”

The researchers, whose findings have been published in the ‘Journal of Clinical Oncology’, said only eight of the 23 studies had reliable and up-to-date information.

Later this year, a £20 million research project is expected to show those who used mobiles for a decade or longer could have “significantly increased” risk of developing some types of brain tumours.

Powerwatch, which has examined electro-magnetic fields and health dangers for 20 years, said there was enough evidence to warn people to limit mobile phone use and ban them from children.