IL-5 is overexpressed in the esophagus of patients with EoE (Straumann et al., 2001; Bullock et al., 2007; Molina-Infante et al., 2014) and correlates with esophageal eosinophilia and disease activity (Namjou et al., 2014). The gene discussed is IL5; the disease is eosinophilic esophagitis.