Blood eosinophils in chronic obstructive pulmonary disease: A potential biomarker.

Chronic obstructive pulmonary disease (COPD) is a common, preventable and treatable disease that is characterized by persistent respiratory symptoms and airflow limitation.[1] The underlying cellular and molecular mechanisms of COPD are still insufficiently understood. The variable clinical characteristics and differences in response to therapy suggest that COPD may have different phenotypes. The identification of phenotypes based on biomarkers could help clinicians to establish individual treatment programs for patients with COPD.