ACE and acute respiratory distress syndrome: The Ace gene insertion/deletion (I/D) polymorphisms correlate with the susceptibility for and severity of ARDS (Marshall et al., 2002; Jerng et al., 2006; Adamzik et al., 2007; Tsantes et al., 2013) with those patients carrying a lower risk that are homozygous for the insertion (II) genotype (Adamzik et al., 2007).