Lung Cancer Screening Program Using Low-dose Tomography and Metabolomic Evaluation in a Public Service.

Inclusion Criteria : Age between 45 and 74 years old; Smoker with a smoking history of at least 30 pack-years or former smoker who has quit smoking for less than 15 years; Never having participated in a lung cancer screening program ; Signing of the free and informed consent form. Exclusion Criteria: Patients with chronic diseases (cardiovascular, pulmonary, hepatic, renal or metabolic) at an advanced stage that limit life expectancy or make it impossible to perform a curative surgical procedure; Patients being treated for tuberculosis or other granulomatous diseases; Patients diagnosed with previous neoplasm(s) that could develop lung metastases; Pregnant women; Patients who, for some reason, are unable to undergo low-dose chest computed tomography; Patients previously submitted to thoracic radiotherapy.