In 2011 the International Agency for Research on Cancer (IARC) classified cellphones as a Group 2B "possible carcinogen,"1 and the evidence supporting the theory that electromagnetic field (EMF) radiation from cellphones can trigger abnormal cell growth and cancer2,3 just keeps growing and getting stronger.
In February, the findings of two government-funded animal studies4 were published. Curiously enough, the published interpretation of this $25 million research (conducted by the National Toxicology Program (NTP), an interagency research program currently under the auspices of the National Institute of Environmental Health Sciences) significantly downplays the actual findings of the studies.
Cellphone Radiation Linked to Brain and Heart Tumors
The NTP research includes two studies: one on mice and one on rats. Male rats were more likely to develop heart tumors, while female rats and newborns exposed to high levels of radiation during pregnancy and lactation were more likely to have low body weight. DNA damage and damage to heart tissue were also observed in both male and female rats, but not mice. Other types of tumors did occur in both types of animals, though, including brain, prostate, liver and pancreatic tumors.
According to the researchers, if these results can be confirmed, then cellphone radiation may indeed be a "weak" carcinogen. As you'll see below, that confirmation was delivered last month, in the form of published research by the Ramazzini Institute.
The animals in the NTP studies were exposed to cellphone radiation for nine hours a day for two years (basically the full life span of a rat). As noted by The New York Times,5 the heart tumors (malignant schwannomas) found in male rats are "similar to acoustic neuromas, a benign tumor in people involving the nerve that connects the ear to the brain, which some studies have linked to cellphone use."
The scientists also expressed surprise at the finding of DNA damage, as the conventional belief is that nonionizing radiofrequency radiation cannot harm DNA. "We don't feel like we understand enough about the results to be able to place a huge degree of confidence in the findings," John Bucher, Ph.D.,6 senior scientist at the NTP told reporters. Such statements fly in the face of warnings issued by NTP researchers two years ago.
NTP and Ramazzini Show Effects Are Reproducible
The NTP-funded studies found rats exposed to RF radiation began developing glial cell hyperplasias — indicative of precancerous lesions — around week 58; heart schwannomas were detected around week 70. Ramazzini's study confirms and reinforces these results, showing RF radiation increased both brain and heart tumors in exposed rats. This, despite the fact that Ramazzini used much lower power levels.
While NTP used RF levels comparable to what's emitted by 2G and 3G cellphones (near-field exposure), Ramazzini simulated exposure to cellphone towers (far-field exposure). In all, the Ramazzini Institute exposed 2,448 rats to 1.8 GHz GSM radiation at electric field strengths of 5, 25 and 50 volts per meter18 for 19 hours a day, starting at birth until the rats died either from age or illness.
To facilitate comparison, the researchers converted their measurements to watts per kilogram of body weight (W/kg), which is what the NTP used. Overall, the radiation dose administered in the Ramazzini study was up to 1,000 times lower than the NTP's — yet the results were strikingly similar. As in the NTP studies, exposed male rats developed statistically higher rates of heart schwannomas than unexposed rats.
They also found some evidence, although weaker, that RF exposure increased rates of glial tumors in the brains of female rats. As noted by Ronald Melnick, Ph.D., a former senior NIH toxicologist who led the design of the NTP study and current senior science adviser to the Environmental Health Trust:19
"All of the exposures used in the Ramazzini study were below the U.S. FCC limits… In other words, a person can legally be exposed to this level of radiation. Yet cancers occurred in these animals at these legally permitted levels. The Ramazzini findings are consistent with the NTP study demonstrating these effects are a reproducible finding. Governments need to strengthen regulations to protect the public from these harmful non-thermal exposures."
The NTP's conclusion that there's no cause for concern is also challenged by an independent review panel, which concluded its review of the two NTP studies March 28. According to this panel of experts, there's "clear evidence" linking RF radiation with heart schwannomas and "some evidence" linking it to brain gliomas. It remains to be seen whether the NTP will accept or reject the panel's conclusions in its final report.
Why Evidence of Rodent Schwannomas Could Spell Trouble for Human Health
As explained by Louis Slesin, Ph.D., editor and publisher of Microwave News, the increased incidence of schwannomas in rodents exposed to RF is no mere coincidence, and is of great concern for public health:20
"Schwann cells play a key role in the functioning of the peripheral nervous system. They make the myelin sheath, which insulates nerve fibers and helps speed the conduction of electrical impulses. There are Schwann cells just about everywhere there are peripheral nerve fibers. They are present in most organs of the body — whether mice, rats or humans. Schwann cell tumors are called schwannomas.
The NTP found schwannomas in many other organs, in addition to the heart, of rats chronically exposed to cellphone radiation. These included a variety of glands (pituitary, salivary and thymus), the trigeminal nerve and the eye … The NTP also saw schwannomas in the uterus, ovary and vagina of female rats. The brain has no Schwann cells —the brain is part of the central nervous system. There, glial cells play a similar function. In fact, Schwann cells are a type of glial cell …
Tumors of the glial cells are called gliomas. The NTP also saw an increase in glioma among the male rats exposed to GSM and CDMA radiation. Higher rates of glioma have been reported in a number of epidemiological studies of cellphone users. The other tumor linked to cellphone radiation in human studies is acoustic neuroma, a tumor of the auditory nerve … formally called a vestibular schwannoma.
While schwannomas and gliomas are commonly noncancerous tumors, they can develop into malignant schwannomas or glioblastomas … The implication is that instead of searching for consistency in RF's ability to cause cancer in specific organs, the emphasis should now be on specific cell types — beginning with Schwann cells in the periphery and glial cells in the brain."
