GSTP1 and COVID-19: Our results on the association of GSTP1 polymorphisms with risk of COVID-19 seem biologically plausible since GST pi 1 (GSTP1) is highly expressed in lung tissue and might even be considered the predominant GST in the lungs (Terrier et al., 1990; Anttila et al., 1993; Cantlay et al., 1994; Rowe et al., 1997).