Serum concentrations of Krebs von den Lungen-6 in different COVID-19 phenotypes

Abstract We thank Nakamura H et al for sharing their clinical results on the glycoprotein Krebs von den Lungen-6 (KL-6) in differential phenotyping of COVID-19 patients It is currently accepted that KL-6, a human mucin protein expressed by type 2 pneumocytes, is a biomarker of several interstitial lung diseases (ILD), including idiopathic pulmonary fibrosis (1) This article is protected by copyright All rights reserved