phones and non-Hodgkin lymphoma
US case-control study
has examined the role of cell phone use in the occurrence of non-Hodgkin
lymphoma (NHL). There were 551 cases (79% participation) and 462
controls (55% participation). There was little evidence of an increased
risk of NHL with use of cell phones. One non-statistically significant
increased odds ratio was
seen in men who used cell phones for 6 years or more, but this was
based on 7 cases, there was no dose-response trend, and there was
no similar result in women. The authors suggested that this was
likely to be a chance finding.
more, see "Research - Epidemiology".
Linet MS, Taggart T, Severson RK, Cerham JR, et al. Cellular telephones
and non-Hodgkin lymphoma. Int J Cancer 2006;119:2382-2388.
has no effect on cell death or p53 gene expression
and colleagues exposed two types of human cells to RFR similar to
that used in the International Mobile Telecommunication 2000 (IMT-2000)
cellular system. They were exposed to W-CDMA radiation and CW radiation
at SARs up to 800 mW/kg for 48 hours. No significant differences
were seen in the percentage of apoptotic
cells that were RFR-exposed or sham-exposed, or in expression of
phosphorylated p53 gene or total p53.
For more, see "Research -
Toxicological - Cancer studies and - Others-
Hirose H, Sakuma N, Kaji N, Suhara T, et al. Phosphorylation and
expression of p53 are not affected in human cells exposed to 2.1425
GHz band CW or
W-CDMA modulated radiation allocated to mobile hone radio base stations.
Assessment of health effects of EMF by
WHO, IARC, and ICNIRP
In the September issue of the Radio Science Bulletin, Vecchia reviews
the different roles of WHO, IARC, and ICNIRP in the assessment of
health effects associated with electromagnetic fields. The article
is based on the invited Commission K lecture at the XXVIIth General
Assembly of URSI in October, 2005, at New Dehli. The Bulletin can
be accessed at www.ursi.org .
Two studies of RFR and oxidative
stress in rats
recent studies have examined the effect of exposure to RFR on the
production of oxidative stress in rats. Yurekli and colleagues simulated
far-field exposure from base stations, and found significant changes
in blood levels of markers of oxidative stress.
Ferreira et al. however, found no evidence of oxidative stress in
the brains of rats exposed at a higher SAR level.
more, see "Research - Toxicological
- others- Free oxygen radicals".
Yurekli AI, Ozkan M, Kalkan T, Saybasili H, et al. GSM base station
electromagnetic radiation and oxidative stress in rats. Electromagnetic
Biology and Medicine 2006;25:177-188.
AR, Bonatto F, Pasquali MA, Polydoro M, et al. Oxidative stress
effects on the central nervous system of rats after acute exposure
to ultra high frequency electromagnetic fields. Bioelectromagnetics
magnetic resonance spectroscopy in evaluating brain function in
cell phone users
and colleagues from Montreal, Canada, used the technique of proton
magnetic resonance spectroscopy (MRS) that, they claimed, had never
been used before to study the possible effects of cell phones on
brain function. MRS allows the non-invasive examination of the brain
by measuring the levels of certain metabolites that reflect the
condition of neurons and glial cells, as well as membrane metabolism
and energy status.
Twenty-one individuals who extensively used cell phones and 15 controls
took part in the study. The cell phone users had been using their
phones for an average of 5.5 years and 2.4 hours per day. The controls
had never used a cell phone. The authors examined brain areas that
are among those most irradiated by the antenna of the cell phone
- the temporal lobe on the side of phone use, and the pontobulbar
area. They also examined the contralateral temporal area as a control.
There were no significant differences between the users and the
non-users. Also, there were no differences between the ipsi- and
contra- lateral sides of the users.
more, see “Research
- Clinical - cognitive function”.
Khiat A, Boulanger Y, Breton G. Monitoring the effect of mobile
phone use on the brain by proton magnetic resonance spectroscopy.
International Journal of Radiation Biology 2006;82:681-685.
RFR exposure associated with decreased
and colleagues from Korea have reported a study of 21 teenagers
and 21 adults who were RFR- or sham-exposed. The RFR was from a
CDMA phone (835 MHz, SAR 1.6 W/g). The exposure was 30 minutes.
There were no differences in pulse or respiratory rates or in blood
pressure between the RFR and sham exposures in the teenagers, the
adults or between the combined male and female groups. However,
skin resistance, caused by increased sweat secretion, was decreased
in the teenagers, and in the combined male group, when exposed to
RFR. The study was double blind, but can be criticized for the lack
of randomization of the sequence of exposure. The sham exposure
was always first.
more, see “Research - Clinical
– cardiovascular effects”.
Nam KC, Kim SW, Kim SC, Kim DW. Effects of RF exposure of teenagers
and adults by CDMA cellular phones. Bioelectromagnetics 2006;27:509-514.