The Ecolog Institute, a German research organisation which has been examining the effects of mobile phones since 1992, was commissioned by T-Mobile in 2000 to investigate the possible health risks of mobile phone masts.
Dr Peter Neitzke, one of the authors of the eventual report, said that when T-Mobile realised that the research was going to produce potentially damaging results, the company immediately commissioned three other studies which were more likely to show no danger from electromagnetic radiation.
Neitzke's study was available only in Germany until it was leaked to the Human Ecological Social Economic Project (HESE) earlier this month.
The Ecolog study concluded:
'Given the results of the present epidemiological studies, it can be concluded that electromagnetic fields with frequencies in the mobile telecommunications range do play a role in the development of cancer. This is particularly notable for tumours of the central nervous system.'
T-Mobile told the Daily Mail:
'It was the aim of T-Mobile to engage four different institutes with the same questions to guarantee an independent and objective discussion. All the institutes and people involved are well known and respected experts.'
This article first appeared in the Ecologist April 2007