Blood eosinophils and chronic obstructive pulmonary disease: A Global Initiative for Chronic Obstructive Lung Disease Science Committee 2022 review

Abstract

The Global Initiative for Chronic Obstructive Lung Disease (GOLD) published its first report for the diagnosis and management of chronic obstructive pulmonary disease (COPD) in 2001 (1). Since then, GOLD has updated it yearly (2), the last time in 2022 (www.goldcopd.org). To do so, GOLD critically evaluates the new evidence since the previous publication and decides whether it merits (or not) inclusion in the most recent update. GOLD publishes specific recommendations and, sometimes, the main arguments behind them, but it often lacks space for a detailed discussion regarding the pros and cons behind each recommendation. To address this limitation, the Scientific Committee of GOLD decided to publish, separately from the main annual update, a series of papers that review and discuss topics of particular current interest for clinical practice. The GOLD 2019 report recommended using blood eosinophil counts (BEC) as part of a precision medicine strategy to identify the most suitable patients for inhaled corticosteroids (ICS) treatment (3). Recent publications have provided further evidence and insights concerning BEC in COPD. Here, we discuss the role of BEC as a COPD biomarker, focusing on new advances and summarizing the associated changes in the GOLD 2022 report (shown in Table 1).