A number of genome-wide association studies have linked CTNNA3 to chemical-induced occupational asthma (Kim et al., 2009; Bernstein et al., 2013), steroid refractory asthma (Perin and Potocnik, 2014) and asthmatic exacerbations (McGeachie et al., 2015). This evidence concerns the gene CTNNA3 and occupational asthma.