AIM : To investigate the association TNF-α gene-308G/A polymorphism with essential hypertension(EH). METHODS : Polymerase chain reaction and Restriction fragment length polymorphism(PCR-RFLP) was used to screen the TNF-α-308G/A polymorphism and the distribution feature of genotypic frequency in 246 EH patients and 208 healthy people.The association of polymorphism and EH hereditary susceptibility was analysed. RESULTS :In the EH group,the frequencies of GG,GA and AA genotypes were 85.0 %,11.8 % and 3.2 %,respectively.The frequencies of...