EMF Health-effects Research
Case-control study on radiology work, medical X-ray investigations, and use of cellular telephones as risk factors for brain tumors
Hardell L, Nasman A, Pahlson A, Hallquist A
Medscape General Medicine May 4, 2000
Context. Ionizing radiation is a well-established risk factor for brain
tumors. During recent years, microwave exposure from the use of cellular telephones has been discussed as a potential risk factor.
Participants. A total of 233 currently living men and women, aged 20 to 80 years, were included. The case patients had histopathologically verified brain tumors and lived in the Uppsala-Orebro region (1994-1996) or the Stockholm region (1995-1996). Two matched controls to each case were selected from the Swedish Population Register.
Main Outcome Measures. Ionizing radiation and use of cellular telephones as risk factors for brain tumors.
Results. A total of 209 cases (90%) and 425 controls (91%) answered the questionnaire.
The result was further strengthened (OR, 2.62; 95% CI, 1.02-6.71) in a multivariate analysis that included laboratory work and medical diagnostic x-ray investigations of the head and neck.
Conclusion. Exposure to ionizing radiation, work in laboratories, and work in the chemical industry increased the risk of brain tumors. Use of a cellular telephone was associated with an increased risk in the anatomic area with highest exposure.