GSTP1 and asthma: The GSTP1 gene is positioned in the chromosome 11q13 whereas the polymorphisms of GSTP1 gene act as danger elements for asthma disease especially four alleles such as GSTP1A (Ile105–Ala114) GSTP1B (Val105–Ala114), GSTP1C (Val105–Val114) and GSTP1D (Ile105–Val114) [9–11].