37 of our 1201 patients were registered in the Danish Lung Cancer Register on the October 17, 2007. Nine of the patients had been diagnosed prior to the chest x-ray and one patient was diagnosed as having a mesothelioma. Out of the 1192 referred to a chest x-ray under different diagnoses (without the 9 known lung cancers) 27 (2.2 %) turned out within the next 2 years to have lung cancer.