For GSTP1, the exposed I/V+V/V displayed a tendency towards a protective effect, which is in line with the study by Mapp et al. (13) on TDI-asthma and GSTP1. On the other hand, GSTP1 I/V+V/V subjects had an increased risk of cough with mucus among the non-exposed subjects. The gene discussed is GSTP1; the disease is asthma.