Periostin is highly expressed by epithelial cells, is bound by αvβ3 and αvβ5 integrins, is upregulated in epithelial tumors to support adhesion and migration (Gillan et al., 2002; Yuyama et al., 2002; Liu and Du, 2015), and is a prognostic marker for TH2-driven asthma (Parulekar et al., 2014) and lung fibrosis (Amara et al., 2015). This evidence concerns the gene POSTN and asthma.