By Allen Tsai | Mon Dec 07, 2009 5:40 am |
A new study found no link between rising cell phone use and rates of brain cancer, Scandinavian researchers reported, but added that more studies were needed -- yielding mixed results in the debate on the hazards of handset usage.
According to the 30-year study published in the Journal of the National Cancer Institute, Scandinavian researchers found no increase in brain tumor diagnoses from 1998 to 2003."We did not detect any clear change in the long-term time trends in the incidence of brain tumors," said Isabelle Deltour, a researcher in the Danish Cancer Society. However, Deltour conceded that the research was not definitive, adding that it was possible that tumors taking longer than 10 years to develop were not observed in the study. "Because of the high prevalence of mobile phone exposure in this population and worldwide, longer follow-up of time trends in brain tumor incidence rates are warranted," Deltour advised. Some researchers are concerned that low levels of radiation from handsets -- a form of non-ionizing, low-frequency radiation -- may damage DNA and cause cancers of the brain and central nervous system. But thus far, studies have failed to establish any clear link between cell phone use and several kinds of cancers. Four years ago, Danish scientists reported that handset use of brain tumors were unlikely connected. French and Norwegian researchers reported similar results last year. But some U.S. and British scientists have suggested that many of the previous studies were funded by handset makers themselves -- and had a "systemic-skew" which greatly underestimated the chance of tumors. In September, the U.S. Senate Health Committee said it would investigate potential connections between handset use and brain cancer, worrying that the case may be similar to the cigarette-lung cancer link of the 1970s where tobacco companies denied the cause for decades. An estimated 275 million people in the U.S. and 4 billion worldwide use cell phones. To see which phones are the safest and which phones are the most dangerous, visit CellRisk.com.
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