A Translational Study for Prediction of Biomarkers and Identification of Phenotype and Endotype of COPD and Pre-COPD Outcomes in Chinese Population

This study in Chinese patients examines biological markers (biomarkers) in people with established COPD (chronic obstructive pulmonary disease) and those in the early stages of lung damage, to better understand how the disease develops and predict outcomes. **You may be eligible if...** - Able to perform breathing function tests - Willing and able to follow the study protocol - Able to give informed consent **You may NOT be eligible if...** - Have a lung condition other than COPD that would confuse the results - Are currently a heavy smoker unwilling to participate in related assessments - Have recently had a serious respiratory infection or flare-up that has not resolved Talk to your doctor to see if this trial is right for you.