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Journal Article
Review
The Reemergence of the Asthma-COPD Overlap Syndrome: Characterizing a Syndrome in the Precision Medicine Era.
Current Allergy and Asthma Reports 2016 November
PURPOSE OF REVIEW: The asthma-COPD overlap syndrome (ACOS) has reemerged in the medical literature. This review addresses our current understanding of ACOS as a clinical and biological entity and how new and existing therapies may be targeted to this group.
RECENT FINDINGS: Many studies suggest that ACOS is common and associated with more morbidity than asthma and COPD in general. However, there is no consensus on an ACOS definition, likely due to the heterogeneity of the disease. Variable definitions have led to variable results in ACOS studies. Given this clinical variability, biomarkers (e.g., eosinophils and type 2 inflammatory markers) are increasingly being used to identify an ACOS molecular phenotype which appears to be more responsive to inhaled corticosteroids. Although ACOS has become a popular diagnosis, it is unclear whether identifying ACOS as a separate disease entity is clinically useful. Future studies should focus on identifying key clinical features and biomarkers that characterize vulnerable and treatment-responsive patients.
RECENT FINDINGS: Many studies suggest that ACOS is common and associated with more morbidity than asthma and COPD in general. However, there is no consensus on an ACOS definition, likely due to the heterogeneity of the disease. Variable definitions have led to variable results in ACOS studies. Given this clinical variability, biomarkers (e.g., eosinophils and type 2 inflammatory markers) are increasingly being used to identify an ACOS molecular phenotype which appears to be more responsive to inhaled corticosteroids. Although ACOS has become a popular diagnosis, it is unclear whether identifying ACOS as a separate disease entity is clinically useful. Future studies should focus on identifying key clinical features and biomarkers that characterize vulnerable and treatment-responsive patients.
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