study shows no association of wireless phones with brain cancer
New" of November 1999, we reported results of a study by Muscat
that were presented at a conference in June1999. This study has
now been published in the Journal of the American Medical Association.
A total of 469 persons with brain cancer at 5 US academic medical
centres were compared with 422 control subjects without brain cancer,
with regards to their use of handheld cellular telephones. The authors
found that the use of handheld cellular telephones was unrelated
to the risk of brain
Muscat JE, Malkin MG, Thompson S, Shore RE, et al. Handheld cellular
telephone use and risk of brain cancer. JAMA 2000;284:3001-3007.
another study shows the same.
Because of recent
public interest, the New England Journal of Medicine has released
an article on cellular telephone use and brain tumours before its
publication date. The final version will be published on January
11, 2001.This study from the National Cancer Institute in the USA
was conducted between 1994 and 1998, and compared 782 persons with
brain tumour to 799 control subjects. Again there was no evidence
that the risk of brain
tumour was increased among those that used cell phones. Further,
the authors did not find higher risks among those that used their
phones for 60 or more minutes per day or regularly for 5 or more
PD, et al. http://www.nejm.org/content/inskip/1.asp
radiation in pregnant rats makes no difference to their offspring's
were exposed throughout pregnancy to a low level (0.1mW/cm²).
900 MHz pulsed EMF that approximated the highest legal exposure
of normal populations to the radiation of base antennas of the GSM
digital phone technology. Control rats were sham-exposed. The average
whole body SAR was between 17.5 and 75 mW/kg. There were no differences
in litter size, the evolution of body mass, or developmental landmarks.
The offspring were tested as adults for learning deficits. EMF exposure
was not associated with any measurable cognitive
Bornhausen M, Scheingraber H. Prenatal exposure to 900 MHz, cell-phone
electromagnetic fields had no effect on operant-behavior performances
of adult rats. Bioelectromagnetics 2000;21:566-574.
Cell phone radiation and pregnancy outcome
of this study from Turkey exposed 12 pregnant rats to radiation
in the range 890-915 MHz for 2 hours daily from the first day of
pregnancy. The SAR was 0.155 W/kg. The exposed rats were compared
to rats not exposed to radiation. Litter size was unaffected. Routine
blood tests in the rats and in their offspring were normal. Birth
weight of the irradiated rats, however, was lower than in the sham-exposed
group. The weight deficiency was overcome by 3 months. The authors
state that they do not know whether the birth weight decrease in
the first generation offspring was a specific effect of microwave
radiation or a nonspecific stress reaction. The rats were followed
in their next pregnancy and the birth weight of offspring of this
generation was normal.
Dasdag S, Akdag MZ, Ayyildiz O, Demirtas OC, et al. Do cellular
phones alter blood parameters and birth weight of rats? Electro-
and Magnetobiology 2000;19:107-113.
damage to DNA in human blood cells from RF radiation
An article published
recently in Radiation Research examined the effect of pulsed 2,450
MHz RF radiation on DNA
in human lymphocytes. The blood cells were exposed for 2 hours to
the radiation and the mean SAR was 2.135 W/kg. There was no evidence
of any damage to the DNA either immediately or 4 hours after the
radiation exposure. These results are in contrast to previous studies
by Lai and Singh that reported DNA damage following RF radiation
(see "Research - Toxicological
- cancer studies"). The authors of the present study review
possible reasons in the laboratory techniques for their failure
to replicate the results of Lai and Singh.
Vijayalaxmi, Leal BZ, Szilagyi M, Prihoda TJ, et al. Primary DNA
damage in human blood lymphocytes exposed in vitro to 2450 MHz radiofrequency
radiation. Radiation Research 2000;153:479-486.