Studying Genes in Blood and Lung Fluid Samples From Patients With Chronic Obstructive Pulmonary Disease With or Without a Previous Diagnosis of Lung Cancer or With Asthma Treated With Budesonide and Formoterol

budesonide/formoterol fumarate dihydrate inhalation aerosol

DNA methylation analysis

comparative genomic hybridization

microarray analysis

bronchoalveolar lavage

immunoenzyme technique

laboratory biomarker analysis

bronchoscopy