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.