Questions remain about cell phone link to cancer
http://tennessean.com/apps/pbcs.dll/article?AID=/2 [2008-7-14]
Tag : Interphone
"It's fair to say that the data aren't all in yet," says Dr. DavidL. McCormick, a biologist and director of the Illinois Institute ofTechnology Research Institute in Chicago, who has studied theissue. "There are a small number of epidemiological studies thathave suggested a possible increase in cancer risk. But comparablestudies in other populations haven't confirmed these findings."
That's not to say anyone should panic. Cell phones do produce atype of radiation, but it's of the type called nonionizing radiofrequency a form of energy on the electromagnetic spectrum. Atthe high end of the spectrum, ionizing radiation, such as thatemitted by X-ray machines, has well-known dangers. But the weaksignals released by nonionizing radio frequencies do not cause DNAdamage, and there is no explanation for how such energy could causecancer, McCormick says. Little evidence found
Most studies have not consistently demonstrated a link between cellphone use and cancer, including two studies conducted by theNational Cancer Institute. Several other studies coordinatedthrough the International Agency for Research on Cancer, called theInterphone studies, have also failed to show an association.Numerous laboratory studies on animals have also found no evidencethat DNA is damaged by low levels of radio frequency, McCormicksays.
But the sheer number of people using cell phones and the volume ofuse, as well as a few studies that found a potential link betweenbrain cancer and cell phones, have kept the safety questionlooming.
The National Academy of Sciences released a report in Januarycalling for more research on cell phones and health risks. Theauthors concluded that many of the past studies were not conductedover a long-enough period of time to assess the risk of braincancer, which typically develops slowly.
Nor have the studies examined the effects of cellphone use onchildren, whose nervous systems are still developing, or on whetherthe radio frequency emissions can cause other types of healthproblems, such as cancers elsewhere in the body or central nervoussystem damage that may affect learning or behavior, says Dr. LeekaKheifets, a professor of epidemiology at the University ofCalifornia, Los Angeles' School of Public Health, who was a memberof the NAS panel.
"It's fair to say that the data aren't all in yet," says Dr. DavidL. McCormick, a biologist and director of the Illinois Institute ofTechnology Research Institute in Chicago, who has studied theissue. "There are a small number of epidemiological studies thathave suggested a possible increase in cancer risk. But comparablestudies in other populations haven't confirmed these findings."
That's not to say anyone should panic. Cell phones do produce atype of radiation, but it's of the type called nonionizing radiofrequency a form of energy on the electromagnetic spectrum. Atthe high end of the spectrum, ionizing radiation, such as thatemitted by X-ray machines, has well-known dangers. But the weaksignals released by nonionizing radio frequencies do not cause DNAdamage, and there is no explanation for how such energy could causecancer, McCormick says. Little evidence found
Most studies have not consistently demonstrated a link between cellphone use and cancer, including two studies conducted by theNational Cancer Institute. Several other studies coordinatedthrough the International Agency for Research on Cancer, called theInterphone studies, have also failed to show an association.Numerous laboratory studies on animals have also found no evidencethat DNA is damaged by low levels of radio frequency, McCormicksays.
But the sheer number of people using cell phones and the volume ofuse, as well as a few studies that found a potential link betweenbrain cancer and cell phones, have kept the safety questionlooming.
The National Academy of Sciences released a report in Januarycalling for more research on cell phones and health risks. Theauthors concluded that many of the past studies were not conductedover a long-enough period of time to assess the risk of braincancer, which typically develops slowly.
Nor have the studies examined the effects of cellphone use onchildren, whose nervous systems are still developing, or on whetherthe radio frequency emissions can cause other types of healthproblems, such as cancers elsewhere in the body or central nervoussystem damage that may affect learning or behavior, says Dr. LeekaKheifets, a professor of epidemiology at the University ofCalifornia, Los Angeles' School of Public Health, who was a memberof the NAS panel.
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