GSTP1 and asthma: The GC haplotype composed of GSTP1 gene rs1695 and rs4891 may pose a risk for childhood asthma [P = 0.025, OR = 2.12 (1.09–4.10)], while the AT haplotype may be protective [P = 0.025, OR = 0.47 (0.24–0.92)].