CSF1 and asthma: Consistently, in our previous pilot study, based on a sputum microarray expression profile, we found that CSF1 was a key gene in the pathogenesis of asthma,29 subsequent research showed CSF1 was significantly increased in severe and eosinophilic asthma, but there was few research focusing on the clinical significance and potential underlying mechanism of CSF1 in BEAS‐2B cells.