Mobile phones, cordless phones and the risk for brain tumours.
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Date
2009-06-10
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Abstract
The Hardell group conducted during 1997 2003 two case control studies on brain tumours including assessment of use of mobile phones and cordless phones The questionnaire was answered by 905 90 cases with malignant brain tumours 1 254 88 cases with benign tumours and 2 162 89 population based controls Cases were reported from the Swedish Cancer Registries Anatomical area in the brain for the tumour was assessed and related to side of the head used for both types of wireless phones In the current analysis we defined ipsilateral use same side as the tumour as or 50 of the use and contralateral use opposite side as Under50 of the calling time We report now further results for use of mobile and cordless phones Regarding astrocytoma we found highest risk for ipsilateral mobile phone use in the 10 year latency group OR 3 3 95 CI 2 0 5 4 and for cordless phone use OR 5 0 95 CI 2 3 11 In total the risk was highest for cases with first use Under20 years age for mobile phone OR 5 2 95 CI 2 2 12 and for cordless phone OR 4 4 95 CI 1 9 10 For acoustic neuroma the highest OR was found for ipsilateral use and 10 year latency for mobile phone OR 3 0 95 CI 1 4 6 2 and cordless phone OR 2 3 95 CI 0 6 8 8 Overall highest OR for mobile phone use was found in subjects with first use at age Under20 years OR 5 0 95 CI 1 5 16 whereas no association was found for cordless phone in that group but based on only one exposed case The annual age adjusted incidence of astrocytoma for the age group 19 years increased significantly by 2 16 95 CI 0 25 to 4 10 during 2000 2007 in Sweden in spite of seemingly underreporting of cases to the Swedish Cancer Registry A decreasing incidence was found for acoustic neuroma during the same period However the medical diagnosis and treatment of this tumour type has changed during recent years and underreporting from a single center would have a large impact for such a rare tumour