Using a mobile phone does not increase the risk of brain cancer, claim scientists. Research into cancer rates of one of the largest groups of mobile phone users ever studied found no difference compared with people who did not use them. It is the second major study this year to rule out any change in rates of the disease – despite more than 70 million mobile phones being used in the UK. The latest Danish study investigated data on more than 358,000 mobile users over 18 years, thought to be the longest follow-up so far. But campaigners insisted the research was ‘seriously flawed’ and would falsely reassure mobile phone users. There have been fears that cancer could be triggered by the brain’s exposure to electromagnetic radiation emitted from mobile handsets held to the ear. But the researchers said they observed no overall increased risk for tumours of the central nervous system or for all cancers combined in mobile phone users.