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Use of mobile phones and risk of brain tumours: update of Danish cohort study

BMJ 2011; 343 doi: (Published 20 October 2011) Cite this as: BMJ 2011;343:d6387

Not enough data excluding cellphones' morbidity

This important and huge cohort study presents however strong limits.
It takes into account only individual subscription holders, without
including those who have only one professional cellphone.
More, the daily duration of use of the cellphone is not known, the
subscribtion holders not having been questioned on that point.
These two limits are important, as it is the intensive use of a cellphone
that could cause an increased risk of central nervous system tumour.
If Frei et al. do not exclude that an increase in the risk appears for the
very large users of cellphones (for example for a use of more than 15
years), further studies with more precise data are necessary before
excluding any sanitary risk of mobile phones.

Competing interests: No competing interests

21 October 2011
Philippe Charlier
Luc Brun
Forensic Department, Garches (AP-HP, UVSQ)