A Multicenter Clinical Trial of Sputum DNA Testing for Lung Cancer in China

Inclusion Criteria: * Subject must meet all three of the following criteria to be eligible for the study: 1. No age or gender restrictions, voluntary participation and signing of informed consent form; 2. Meet any of the following conditions: <!-- --> 1. Suspected of lung cancer without invasive examination; 2. Diagnosed with lung cancer without surgery, radiotherapy, chemotherapy, or targeted therapy; 3. Diagnose other respiratory diseases, such as pulmonary infections (bacterial pneumonia, mycoplasma pneumonia, chlamydia pneumonia, viral pneumonia, lung abscess, etc.), interstitial lung diseases (pulmonary fibrosis, pulmonary granulomas, etc.), benign pulmonary nodules, tuberculosis, emphysema, pulmonary cysts, benign pulmonary tumors, obstructive pulmonary disease, bronchial infections/asthma, acute upper respiratory tract infections, etc; 4. Diagnose other malignant tumors, such as thyroid cancer, esophageal cancer, liver cancer, gastric cancer, pancreatic cancer, etc. Exclusion Criteria: * Any of the following conditions must be excluded: 1. Patients who have undergone tracheotomy or have been on a ventilator due to severe illness. 2. The research physician believes that other reasons are not suitable for participants in this trial.