A study to find and treat pre cancerous changes in the lungs (TIDAL1)

This is a study to find out how many people at high risk of getting lung cancer have abnormal cells in the lining of their lungs, and whether a drug called gefitinib could stop these turning into cancer.

For some diseases, it is possible to test people who are at high risk to see if there are early signs before it develops or causes symptoms. This is called screening. Before screening for any type of cancer can be carried out, doctors must have an accurate test to use. At present, there is no screening programme for lung cancer.

Researchers want to find ways of screening groups of people who are at high risk of getting lung cancer.