Hepworth SJ, Schoemaker MJ, Muir KR, Swerdlow AJ, et al. (2006)
This study was part of the Interphone study, a multinational case-control study of cell phone use and the risk of brain tumour. This one was from five regions of the UK, and 966 patients with glioma participated. The response rate, however, was only 51% for patients and 47 % for controls, who were randomly selected from general practitioners' lists. There was a tendency for people with low-grade tumours to be more likely to be interviewed. Both patients and controls who were interviewed were significantly more likely to be affluent than those who did not participate in the interview process.
The overall odds
ratio (OR) of glioma was 0.94 for regular phone users compared
with those who never or only occasionally used cell phones. There
was no significantly increased risk with longer-term use. There was
a significantly increased risk (OR 1.24) for a tumour ipsilateral
to side of phone use, but there was a significantly reduced risk (0.75)
for contralateral use. This combination of results is consistent with
recall bias, where patients with brain tumour have a tendency to over-report
use on the same side as their tumour.