For the GSTP1 polymorphism, the frequency of the variant Val105 allele, although previously reported to be associated with preeclampsia [16] was found to be higher in mothers (25.8%) and fathers (25.0%) of normal pregnancies compared to the preeclamptic group, while a statistically significant difference was detected between the frequency of the individual subgroups compared to that of the normal controls (P = 0.013 and P = 0.001, respectively). The gene discussed is GSTP1; the disease is preeclampsia.