（來自百度）

美國著名匹茲堡大學癌症研究所主任赫貝曼博士前天向3000名教職員發出警告，指打手機有致癌風險，應限制用量。據香港《文匯報》報道，這是首次有大型研究機構發出類似警告，赫貝曼表示，警告是根據未公開的初步研究結果而發出，是要防患未然，若等到有切實證據才行動便會太遲。

警告建議成人應將手機遠離頭部，談話時亦應使用揚聲器或免提裝置；而兒童由於腦部仍在發育，除非緊急情況，否則不應用手機。他又建議不要在巴士等公眾地方使用手機，指會令其他人曝露在電磁場中。科學家一直憂慮手機發出的電磁輻射會影響人體健康，不過學術界對此仍未有定案。

猶他大學本年亦分析9項癌症研究，當中包括赫貝曼引用的研究，涉及數以千計腦瘤病人，結論是“手機客戶長腦瘤的風險整體而言沒提升，長期使用手機的潛在提升風險則有待未來研究證實”。去年在法國及挪威的研究，亦有相同結論。美國食品及藥物管理局(FDA)在網站表示，至今仍未發現手機存在風險，即使有，亦應該很小。

另外，法國去年一項依“Interphone”而作的研究，發現正常手機用量“不會顯著提升”患3種神經系統瘤的風險，但特別提出“最高用量者”患一種特定腦癌的風險“可能提高”，但仍需未來研究證實。

（來自2011年2月22日美國“HealthDay News”）

A one-hour cell phone conversation stimulates the areas of your brain closest to the phone's antenna, but experts say they still have no idea whether these effects pose any long-term health risk.

"We don't know whether this is detrimental or whether it could have some potential beneficial effects. We don't know one way or the other," said Dr. Nora Volkow, who is lead author of the study published in the Feb. 23 issue of the Journal of the American Medical Association. "Studies need to be done to see if there are long-lasting consequences. It's an important question."

For the time being, the best bet is to use an ear piece or the speaker phone, "particularly in children and adolescents whose brains are much more vulnerable to insults of certain kinds," said Volkow, who is director of the U.S. National Institute on Drug Abuse.

For this study, 47 volunteers were brought into a lab at the U.S. National Institutes of Health, where they had cell phones positioned at both their left and right ears.

Researchers measured metabolism of glucose in the brain -- a measure of how hard the organ is working -- using positron emission tomography (PET) scans. Metabolism in the orbitofrontal cortex and temporal pole regions of the brain, those closest to the antenna, was about 7 percent higher when the right phone was in the "on" position than when both phones were off.

Dr. Nora Volkow, Director, NIDA, NIH （Nora D. Volkow, M.D., director, National Institute on Drug Abuse, U.S. National Institutes of Health）