The four-year study aims to recruit 3000 patients (1500 GGO and 1500 solid / semi solid nodules) in the study based on qualifying for a lung cancer screening CT or by routine CT chest with the observation of a lung nodule between 5-30mm diameter. These patients will be followed for 2~3 years and be managed according to institutional standard of care. This may involve the Chinese Thoracic Society guideline or Fleischner criteria (either 2013 or 2017 guidelines). The clinical data, CT imaging and biospecimens will be collected during each visit. Once a patient undergoes surgery, tissue samples (FFPE) from surgery will also be collected.

The gold standard for lung cancer diagnosis will be the results of bronchoscopic biopsy of lung or lymph nodes, percutaneous biopsy of lung or other organ sites, surgical biopsy or resection, or a minimum follow-up of 2 years.