'This was a life-saver': ex-smoker learned she had lung cancer after joining study

Case study: Judy Miller, 74, applied to take part in research into detection of lung cancer

• CT scan catches 70% of lung cancers at early stage, NHS study finds

When Judy Miller got a letter in the post calling for former smokers to take part in a study, she never expected what came next.

Taking part in the research, which examined whether lung cancer could be detected years before it would otherwise have been spotted, Miller discovered that rogue cancer cells had been quietly growing for four years, despite her displaying no symptoms of anything being wrong.