Israeli developers from the Technion-Israel Institute of Technology said that a sensor made with gold nanoparticles can detect lung cancer in a patient’s breath and may offer a diagnosis before tumours show up on an x-ray. The device, which the developers say would be cheap enough for everyday use by family doctors, detected lung cancer with 86% accuracy. It may offer a way to screen for a disease not usually diagnosed until it has spread and is no longer curable