identified major blood proteins based on a proteomic analysis of plasma from patients with severe COVID‐19 using the PEA method and reported that measurement of three proteins (WFDC2, CHI3L1, and KRT19) could identify the poor prognostic subtype, suggesting that measurement could predict severity of COVID‐19 at an early stage.15 The gene discussed is CHI3L1; the disease is COVID-19.