今年以來關于手機是否會致癌尤其是腦癌的問題，在科學界引發(fā)熱烈討論。而10月21日發(fā)布的一份丹麥大范圍研究報告則為手機不會導致腦癌的觀點提供了新證據,。
新一輪討論由國際癌癥研究中心引發(fā)。今年5月,，該研究中心發(fā)布報告稱,，長期、高強度使用手機和其他無線通信設備可能增加患癌癥幾率,。但該結論隨即受到一些無線通信行業(yè)組織質疑,。今年7月，英國癌癥研究所專門就此發(fā)布報告說,，現有證據無法證明使用手機致癌,。
丹麥癌癥流行病研究所等機構的科研人員在最新一期《英國醫(yī)學雜志》上報告說，他們調查了丹麥所有1925年以后出生,、年齡在30歲以上人群的資料,，根據手機運營商的簽約信息，他們被分為手機簽約用戶和非手機簽約用戶兩組,，其中手機簽約用戶超過35萬人,。
同時，研究人員調查了1990年到2007年間丹麥腦癌患者人數,，這段時間正是手機開始大量普及使用的時期,。結果顯示，共有1萬多個腦癌病例,，但對于手機簽約用戶和非手機簽約用戶這兩組人來說,，患腦癌的比例沒有明顯差異。
研究人員說,，這項研究的有力之處在于它覆蓋了丹麥全國人口,，樣本數量足夠多，結果也較為可信,。但它也有不足之處,，即劃分兩組人的標準是手機簽約情況，這并不能完全反應他們如何使用手機,，有些用戶用手機的頻繁程度會比別人高出很多,，而研究中沒有把這部分重度使用者區(qū)分出來?？偟膩碚f,，這項研究結果支持了手機不會導致腦癌的觀點。
使用手機與癌癥尤其是腦癌之間有無因果關系,，還需要科學界進一步研究,。目前科學界和各國管理機構都強調一點,，即青少年應該慎用手機。青少年的耳朵和顱骨比成年人更小,、更薄,，他們在使用手機時，腦部吸收的輻射據稱比成年人要高出50%,。（生物谷 Bioon.com）
doi:10.1136/bmj.d6387
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Use of mobile phones and risk of brain tumours: update of Danish cohort study
Patrizia Frei, postdoctoral research fellow1, Aslak H Poulsen, doctoral student1, Christoffer Johansen, professor1, Jørgen H Olsen, director1, Marianne Steding-Jessen, statistician1, Joachim Schüz, head of section
Objective To investigate the risk of tumours in the central nervous system among Danish mobile phone subscribers.
Design Nationwide cohort study.
Setting Denmark.
Participants All Danes aged ≥30 and born in Denmark after 1925, subdivided into subscribers and non-subscribers of mobile phones before 1995.
Main outcome measures Risk of tumours of the central nervous system, identified from the complete Danish Cancer Register. Sex specific incidence rate ratios estimated with log linear Poisson regression models adjusted for age, calendar period, education, and disposable income.
Results 358 403 subscription holders accrued 3.8 million person years. In the follow-up period 1990-2007, there were 10 729 cases of tumours of the central nervous system. The risk of such tumours was close to unity for both men and women. When restricted to individuals with the longest mobile phone use—that is, ≥13 years of subscription—the incidence rate ratio was 1.03 (95% confidence interval 0.83 to 1.27) in men and 0.91 (0.41 to 2.04) in women. Among those with subscriptions of ≥10 years, ratios were 1.04 (0.85 to 1.26) in men and 1.04 (0.56 to 1.95) in women for glioma and 0.90 (0.57 to 1.42) in men and 0.93 (0.46 to 1.87) in women for meningioma. There was no indication of dose-response relation either by years since first subscription for a mobile phone or by anatomical location of the tumour—that is, in regions of the brain closest to where the handset is usually held to the head.
Conclusions In this update of a large nationwide cohort study of mobile phone use, there were no increased risks of tumours of the central nervous system, providing little evidence for a causal association.
