HELSINKI, Jan. 22 (Xinhua) -- There is no clear connection between mobile phone use and malignant brain tumours, a study from the Radiation and Nuclear Safety Authority of Finland said on Monday.

    The study on the possible connection between mobile phone use and the risk of a malignant brain tumour, glioma, was carried out in Finland, Denmark, Norway, Sweden and England.

    The study showed that mobile phone users were not at an increased risk of developing a glioma.

    Regular use of a mobile phone, duration of use, or the cumulative number of calls had no effect on the risk. The only indication of a potential effect was found among mobile phone users who had used a mobile phone for at least 10 years. They were found to have a slightly increased risk of a tumour on the side of the head on which they held the phone.

    "Even though the results do not indicate that mobile phone use increases the risk of cancer, we need more research data on long-term use," said Anssi Auvinen, research professor at the Radiation and Nuclear Safety Authority.

    Information on mobile phone use was collected using personal interviews. The research data from the participating countries was analyzed by the Radiation and Nuclear Safety Authority of Finland.