A public health campaign, encouraging people throughout England to go to the doctor early if they have symptoms that could indicate lung cancer, has yielded strong results. The Be Clear On Cancer campaign urged people with a cough lasting more than 3 weeks to see a doctor. In the months during which the campaign ran, 700 more people were diagnosed with lung cancer than in the same months of the previous year–an increase of 10%. Four hundred more people than usual were diagnosed in the early stages of lung cancer, when the disease is most treatable, and 300 more received lung cancer surgery. While most cases of a persistent cough are not due to lung cancer, campaign organizers stress that it is better to be safe.