recent papers from the journal "Radiation Research" reported
the effects of radiofrequency radiation (RFR), in cell phone frequencies,
or tumour promotion.
effects after RFR exposure
In this study
the authors investigated the induction of genotoxic
frequency) and the effects on cell cycle kinetics (proliferation
index) after exposure
of human peripheral blood lymphocytes to 900 MHz electromagnetic
fields under different experimental conditions. No statistically
significant differences were detected in terms of either micronucleus
frequency or cell cycle kinetics.
For more, see
"Research - Toxicological
experiments - cancer - genotoxicity"
Zeni O, Chiavoni AS, Sannino A, Antolini A, et al. Lack of genotoxic
effects (micronucleus induction) in human lymphocytes exposed in
vitro to 900 MHz electromagnetic fields. Radiation Research 2003;160:152-158.
increase in tumours in rats from long-term exposure to RFR
This study was
designed to make a direct measurement of the effect of long-term
exposure to RF radiation on the development of cancer in rats. Eighty
male and 80 female F344 rats were placed randomly in each of three
irradiation groups: the sham group received no irradiation; the
FDMA group was exposed to 835.62 MHz FDMA; the CDMA group was exposed
to 847.74 MHz CDMA. The animals were exposed from 6 weeks of age.
They were irradiated for 4 hours per day, 5 days per week for 2
years. A nominal time-averaged brain SAR value was 1.3 ±
found that chronic exposure to 835.62 MHz FDMA or 847.74 CDMA RF
radiation had no significant effect on the incidence of spontaneous
tumours in the rats.
La Regina M, Moros EG, Pickard WF, Straube WL, et al.
The effect of chronic exposure to 835.62 MHz FDMA or 847.74 MHz
radiofrequency radiation on the incidence of spontaneous tumours
Radiation Research 2003;160:143-151.
consistent effect of RFR on DMBA-induced mammary tumours
This study used
dimethyl benz(a)anthracene (DMBA) to promote mammary tumours in
Sprague-Dawley rats. DMBA ingestion is a well-established method
of promoting cancer in susceptible animals.
In two independent
experiments, there was a sham-exposed group and three groups that
were exposed to GSM-900 microwaves. In the first experiment the
SARs, averaged over the whole body, were 3.5, 2.2, and 1.4 W/kg
in the different groups. The SARs in the exposed groups in the second
experiment were 1.4, 0.7, and 0.1 W/kg. The DMBA was administered
when the rats were 55 days old, and the exposure started 10 days
later. The animals were irradiated for 2 hours per day, 5 days per
week, for 9 weeks.
no difference between the groups in terms of latency, number of
tumours, or tumour volumes. In the first experiment there was an
increase in the rate of tumour incidence at 1.4 W/kg, less at 2.2,
and minimal at 3.5. In the second experiment, however, the 1.4 W/kg
group showed a decreased rate of incidence. The authors concluded
that their results were "globally negative".
Anane R, Dulou P-E, Taxile M, Geffard M, et al. Effects of GSM-900
microwaves on DMBA-induced mammary gland tumours in female Sprague-Dawley
rats. Radiation Research 2003;160:492-497.
For more on
these two studies, see "Research
- Toxicological experiments - Cancer - tumour growth and development".