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Don't worry – mobile phones don't cause brain cancer
In just a few decades, mobile phones have firmly entered our lives. However, until now, suspicious users have concerns about their impact on health, and primarily the risk of developing brain tumors. However, recent major studies on this topic give a positive answer to the question of the safety of using mobile phones, according to a press release from the University of Oxford.
Electromagnetic waves are emitted not only by mobile phones, but also by long-familiar and not frightening televisions and radios. Of course, no one applies these household appliances to the body, unlike cell phones. In the latter case, the electromagnetic radiation emitted by these devices penetrates into the tissues to a depth of several centimeters.
The International Agency for Research on Cancer (IARC) classifies this type of electromagnetic radiation as "possibly carcinogenic". And it's not that it is capable of heating biological objects – phones were designed so that such heat was weak and did not cause harm.
However, there are concerns that the electromagnetic radiation of mobile phones may cause adverse biological effects by some as yet unknown mechanisms. The reason for this was, in particular, the results of surveys of people – mobile phone users who have been diagnosed with cancer. But the interpretation of the data obtained in such retrospective studies may be erroneous.
Now researchers from IARC and Oxford University (UK) published the results of a large prospective study (Joachim Schüz et al, Cellular Telephone Use and the Risk of Brain Tumors: Update of the UK Million Women Study, Journal of the National Cancer Institute).
For the analysis, they used data from the "Million Women" research project, in which every fourth British woman born in 1935-1950 took part.
The participants filled out questionnaires regarding the use of cell phones in 2000-2003, and then in 2010-2012. In them, they answered questions about how many years they have been using a mobile phone, as well as how often and for how long they talk on it.
Initially, about 800 thousand British women filled out such questionnaires. About half of those who did not use a mobile phone in the early 2000s became users a decade later, but at the same time they talked on a mobile phone significantly less than more "long-standing" mobile customers.
During 14 years of follow-up of these women, 3,268 (0.4%) cases of brain tumors were registered among them, including gliomas, auditory nerve neurinomas, meningiomas (tumors of the membranes of the brain), tumors of the pituitary gland and eyes. However, the researchers did not find an increased risk of developing these tumors in those who used a cell phone daily, or talked for at least 20 minutes a week, or used a mobile phone for more than 10 years compared to those who did not. And although the mobile phone is most often held near the right ear, the frequency of tumors located on the right or left also did not differ.
The results obtained are in good agreement with the data of another prospective study conducted in Denmark, where it was also not possible to find a link between the development of brain tumors and the use of mobile phones in people who have used cellular communication for at least 13 years.
Thus, it is very likely that mobile phones do not increase the risk of developing brain cancer. Of course, we can say that 14 years is not a long time, and in recent years both the number of cell phone users and the time of their use has increased significantly. However, the phones of the latest generations emit much weaker, so even their most active users today are unlikely to receive such doses as at the dawn of cellular communication.
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