LONDON - People who survived the atom bomb attacks on Hiroshima and Nagasaki have a higher risk of developing a certain kind of brain cancer, researchers report. In a letter to the British journal Lancet researchers at Hiroshima University said they found people who were within 1 km of the epicentre of the bombing were six times more likely to get meningioma - cancer of the membrane covering the brain. They said this matched a similar recent study from Nagasaki.