Shirai T, Ichihara T, Wake K, Watanabe S, et al. (2007):

The authors previously reported that ethylnitrourea (ENU)-exposed rats that had long-term exposure to a 1.439 GHz signal demonstrated no increase in brain tumour development. The authors have now repeated their experiment with a new frequency of RF exposure - the 1.95 GHz W-CDMA signal from the IMT-2000 system that is rapidly becoming the most commonly employed in Japan.

One hundred pregnant F344 rats were injected with ENU at gestation day 18. A total of 500 pups were divided into 5 groups, each with equal number of males and females. Group 1 was untreated controls, from mothers who did not receive the ENU. Group 2 did not have any EMF exposure. Group 3 had sham exposure. Groups 4 and 5 were exposed to EMF from 5 weeks of age, for 90 minutes per day, 5 days a week, for 104 weeks. Group 4 was exposed at a SAR of 0.67 W/kg, and group 5 at 2.0 W/kg.

No significant increase in incidences or numbers of brain tumours was detected in the EMF-exposed groups. In addition, no clear changes in tumour types in the brain were evident. Experienced pathologists carried out the histological examination in a blinded manner.

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