Inclusion Criteria

- Persons 50-75

- Asymptomatic for lung cancer

- Current or former (stopped smoking less than 10 years ago) cigarette smokers

- History of cigarette smoking of at least 20 pack years

- History of cigarette smoking with a family history of lung cancer which gives an
individual a personal risk similar to a smoking history of 20 pk/years (i.e. 1% at 5
years).

- Mentally competent individuals to sign an informed consent.

- Healthy enough to undergo pulmonary resection or stereotactic body radiotherapy.

- A fully informed signed consent form must have been obtained.