Importantly, the clinical grouping (asthma versus non-asthmatic) by EGF conditions (EGF+ve versus EGF-ve) interaction on goblet cell percentage was statistically significant (p = 0.005) indicating that asthmatic samples behaved differently compared with non-asthmatics with respect to the presence or absence of EGF during differentiation. The gene discussed is EGF; the disease is asthma.