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Up to 2 decades of cell phone use does not increase cancer risk Reuters Health Posting Date: December 5, 2006 Last Updated: 2006-12-05 16:08:49 -0400 (Reuters Health) NEW YORK (Reuters Health) - Fears that the electromagnetic fields generated by cellular telephones might cause cancer can be laid to rest, based on a study of more than 400,000 residents of Denmark who had used cell phones for up to 21 years. Dr. Joachim Schüz, from the Danish Cancer Society in Copenhagen, AND his associates first reported in 2001 that cancer incidence had not increased among residents who had used cell phones up until 1996. Their current report continues the follow-up of the same cohort, which included records of private cell phone subscriptions during the period from 1982 to 1995 (n = 420,095). These subjects' personal identification numbers were linked to the files of the Danish Cancer Registry to ascertain incident cases of cancer up until 2002. According to the report in the Journal of the National Cancer Institute for December 6, the time since subjects' first cell-phone subscriptions averaged 8.5 years. Among the men, 14.9% had cell phones for 10 to 21 years; the same was true for 5.5% of female subscribers. During follow-up, 14,249 cases of cancer were diagnosed in the cohort, compared with 15,001 cases that were expected based on the general population (standardized incidence ratio = 0.95). Specifically, there was no increased risk for leukemia OR for tumors of the brain AND nervous system, salivary gland, OR eye. The investigators also evaluated individual brain tumor subtypes -- glioma, meningioma, AND cranial nerve-sheath -- AND again observed no increased incidence by subtype. Furthermore, there was no increased likelihood for gliomas occurring in the temporal AND parietal lobes, which are closest to the cell phone's antenna. An evaluation limited to persons who had used cell phones for at least 10 years also turned up no evidence of an increased incidence of cancer. "It is reassuring that the findings from our cohort study are consistent with most case-control studies conducted worldwide, even though different approaches for exposure assessment were used," Dr. Schüz AND his fellow investigators conclude. J Natl Cancer Inst 2006;98:1707-1713.