Pre-PROLOG 2 We wish to explore the delay in the diagnosis and treatment of lung cancer. All lung cancer patients diagnosed at Odense University Hospital (all Departments) between 1 January 2006 and 30 June 2007 are identified. A questionnaire is sent to all patients still alive, in which the patients among other things are asked about the time of their first symptom, 1st visit to their GP due to symptoms retrospectively related to lung cancer. Another questionnaire is sent to the patients' GP and finally, case records are examined. The delay is divided into patient delay (from first symptom to 1st visit to GP), doctor delay (from 1. visit to GP to referral to chest x-ray/hospital department) and system delay (from referral to start of treatment).