TNF and preeclampsia: Considering the difference in the prevalence of the TNF-α genotype in different ethnicities (8), we studied the role of TNF-α genotype in preeclampsia by determining the correlation between the -238 polymorphism of the TNF-α gene with preeclampsia in the pregnant women referring to two main hospitals (Qaem and Omolbanin) of Mashhad, the second biggest city of IR Iran.