ELANE and acute respiratory distress syndrome: There are several other NE inhibitors in different stages of clinical trials including alvelestat (AZD9668, COPD, phase 2, US national clinical trial number NCT03636347) (Stockley et al., 2013), BAY 85-8501 (noncystic fibrosis bronchiectasis, phase 2, NCT01818544), (Watz et al., 2019), lonodelestat (POL6014, cystic fibrosis, phase 1, NCT03748199) (Barth et al., 2020), CHF6333 (noncystic fibrosis bronchiectasis, phase 1, NCT03056326, NCT04010799) (Gramegna et al., 2017), and elafin (ARDS, phase 1, NCT02944279) (Barnes et al., 2020).