Experts at the U.S. National Institutes of Health are questioning the validity of a widely reported study in rats that linked cellphone radiation to tumors.
The study, released Friday by the federal government's National Toxicology Program (NTP), found "low incidences" of two types of tumors in male rats exposed to the type of radio frequencies emitted by cellphones, the Wall Street Journal reported.
The two types of tumors were glioma brain cancer and benign schwannomas of the heart, according to the $25 million study that is one of the largest and most comprehensive to assess the health impacts of cellphones.
"Given the widespread global usage of mobile communications among users of all ages, even a very small increase in the incidence of disease resulting from exposure to [radio-frequency radiation] could have broad implications for public health," according to an NTP summary of partial findings from the study released late Thursday, the WSJ reported.
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