Martin Beckford and Robert Winnett
London Telegraph 
Saturday, Oct 24th, 2009
Long-term use of mobile phones may be linked to some cancers, a landmark international study will conclude later this year.
A £20million, decade-long investigation overseen by the World Health Organisation (WHO) will publish evidence that heavy users face a higher risk of developing brain tumours later in life, The Daily Telegraph can disclose.
The conclusion, while not definitive, will undermine assurances from the government that the devices are safe and is expected to put ministers under pressure to issue stronger guidance.
A preliminary breakdown of the results found a “significantly increased risk” of some brain tumours “related to use of mobile phones for a period of 10 years or more” in some studies.