| Rapport ARCS mai 2000
Case reports of brain tumors in users of cellular phones initiated a case control study (Hardell et al 1999). Exposure was assessed by questionnaires supplemented over the phone. Use of cellular phones was not associated with increase in risk of tumors, neither overall nor for specified types. There was, however, a non significant association between tumors at a specific location at the side of the head, when also taking into account which side of the head the phone was normally used. This was found for NMT phone users, the number of cases for GSM users was too small for analysis. The authors caution, however, that this latter finding is based on a small number of cases, and that further investigations are necessary before any conclusions can be made. There has also been a substantial discussion about the apparent inconsistency in the study: no overall risk increase, but a risk increase at one location. The authors caution, however, that for GSM use the observation time may still be too short for definitive conclusions.
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