Malignant Brain Tumors and Cordless Phones , Bluetube Headset Protection

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Cordless Phones Brain Tumors

Cancer researchers in Sweden found strong links between malignant brain tumors and using cordless phones, which are comparable to those for using mobile phones.

The cancer research team led by Lennart Hardell at the University of Orebro showed that people who have used mobile phones or cordless phones for more than 2 000 h are all at greatly increased risks of getting malignant brain tumours.

The odds of getting malignant brain tumours compared with those who have never used these phones - expressed as odds ratio, OR – was 5.9 times for analogue mobile phones (older type of mobile phones), 3.7 tines for digital mobile phones and 2.3 times for cordless phones. (OR of 1 indicates no increased risk compared to non-users; OR<1 indicates decreased risk; and OR>1 indicates increased risk.)

For all malignant brain tumours in people who have used the phones for more than ten years, the ORs were 3.0 and 2.8 for analogue and digital mobile phones respectively, and 3.3 for cordless phones. For high-grade astrocytomas (malignant tumour of the astrocyte, a glial cell), the corresponding ORs increased further to 3.7, 3.8, and 3.9 respectively.

The risk of malignant brain tumours is increased for any phone use, regardless of how many years or hours of use. The ORs for analogue and digital mobile phones were 1.5 and 1.3 respectively, and for cordless phone, 1.3. When considering malignant tumours on the same side of the head the phone is used, the ORs rose to 2.1, 1.8, and 1.7 respectively for malignant tumours, and to 2.4, 2.3 and 2.0 respectively for high-grade astrocytomas. This is yet another indication that the tumours are associated with exposure.

These latest results were obtained by analysing the pooled data from two case control studies that yielded similar findings earlier. Pooling the data gave more cases and hence more reliable results. Altogether, there were 905 cases of malignant brain tumours, and 2 162 controls subjects matched for age and sex, and living in the same area of Sweden.

The Swedish researchers are the first team to have studied cordless phones, which depend on the same wireless technology and microwave telecommunication as mobile phones. Although cordless phone were first introduced in 1980, it did not become widely available in Sweden until the digital system was introduced in the early 1990s, and in the United States in 2000 [3]. So, while mobile phones and transmitters were grabbing the headlines (see Box), cordless phones have been silently invading our homes and workplaces.

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