Overall, the results show no increased risk of brain tumors on the cell phone used regularly for at least ten years.

- Had there been an increased risk, we should have set it in Interphone, "said Maria Feychting responsible for the Swedish section of the study.

But in the group who say they talked on the phone more than 1640 hours, the survey shows an increased risk. The think Maria Feychting rather reflect that it is difficult to subsequently remember how much you have talked on the phone, not least as it had a serious form of cancer of the brain.

- Uncertainty about the maximum exposure levels will be investigated in our further research. But so far speak for all the weaknesses in the study than an actual increase in risk, "she says.

Here she also supports the data in the Swedish Cancer Registry. Statistics up to 2007 show no increase of cancer types.

- We believe that the risk increases of the heavy users are reporting errors. But we can not guarantee that it is so. The use of "hands free" is a good way to hedge.

To develop and mengiom glioma of the brain can take up to 15 years. Interphone study, therefore, followed up by two large international studies. These include Cosmos 250 000 where mobile users to be followed for a long time. And there reporting on the number of mobile phone calls and time on the mobile is avoided by allowing researchers to collect data from mobile operators.

The second study is called Cefalo and for children and adolescents between 7 and 19 years. Here, scientists analyze the results right now. Publication takes place until next year.

The present study was funded by the EU’s Fifth Framework Program and the UICC (International Union against Cancer). A quarter of the appropriation came from the mobile industry through the UICC. The researchers' work is regulated by an agreement that will ensure their independence.